treatments-xml/data/C3/23/02/C32302107647C32ACCA0FF66FC25FA18.xml

<document id="4782CE9F2B72E00BDFAB24FDCA9431B0" ID-CLB-Dataset="7010" ID-DOI="10.11646/zootaxa.4965.2.5" ID-GBIF-Dataset="0eea33ca-1f95-4da6-9cee-239291922331" ID-ISSN="1175-5326" ID-Zenodo-Dep="4750207" ID-ZooBank="F957C6AA-5592-47E2-91F5-1AA1F33513F8" IM.materialsCitations_approvedBy="felipe" IM.metadata_approvedBy="felipe" IM.tables_requiresApprovalFor="existingObjects,plazi" IM.taxonomicNames_approvedBy="felipe" checkinTime="1619609337191" checkinUser="plazi" docAuthor="Ramos-Sánchez, Mariela, Carrasco-Rodríguez, Dahani S., García-Madrigal, María Del Socorro &amp; Bastida-Zavala, J. Rolando" docDate="2021" docId="C32302107647C32ACCA0FF66FC25FA18" docLanguage="en" docName="zootaxa.4965.2.5.pdf" docOrigin="Zootaxa 4965 (2)" docStyle="DocumentStyle:647186512141C8FC8976D5BCC54AEB7D.9:Zootaxa.2013-.journal_article" docStyleId="647186512141C8FC8976D5BCC54AEB7D" docStyleName="Zootaxa.2013-.journal_article" docStyleVersion="9" docTitle="Stylochus mistus Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala 2021, sp. nov." docType="treatment" docVersion="7" lastPageNumber="309" masterDocId="3F1A7A687644C322CC37FFF1FFABFF85" masterDocTitle="Marine flatworms (Platyhelminthes: Polycladida) found in empty barnacle shells including a new species, from southern Mexican Pacific" masterLastPageNumber="320" masterPageNumber="301" pageNumber="304" updateTime="1698937761289" updateUser="ExternalLinkService" zenodo-license-document="CLOSED">
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<mods:title id="3263736070957B6FB84090EFFC5FB533">Marine flatworms (Platyhelminthes: Polycladida) found in empty barnacle shells including a new species, from southern Mexican Pacific</mods:title>
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<mods:namePart id="0011D523F09E2550AA838B2B63DD39A2">Ramos-Sánchez, Mariela</mods:namePart>
<mods:affiliation id="959A89077B11A2DAFB4FEF647B1ABC6C">Posgrado en Ecología Marina, Universidad del Mar, Campus Puerto Ángel, Cd. Universitaria S / N, 70902, San Pedro Pochutla, Oaxaca, México. &amp; Laboratorio de Sistemática de Invertebrados Marinos (LABSIM), Universidad del Mar, campus Puerto Ángel, Ciudad Universitaria, Apdo. Postal 47, Puerto Ángel, Oaxaca, 70902, México.</mods:affiliation>
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<mods:namePart id="64B024D50AC9AFBAB547C57611893C31">Carrasco-Rodríguez, Dahani S.</mods:namePart>
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<mods:affiliation id="5D359994DD89D23C59BA795B893DE94E">Laboratorio de Sistemática de Invertebrados Marinos (LABSIM), Universidad del Mar, campus Puerto Ángel, Ciudad Universitaria, Apdo. Postal 47, Puerto Ángel, Oaxaca, 70902, México. &amp; carrascoshanti @ gmail. com; https: // orcid. org / 0000 - 0002 - 5367 - 4397</mods:affiliation>
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<mods:namePart id="5297AADD42226CCFCD253E5BC6BA20C7">García-Madrigal, María Del Socorro</mods:namePart>
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<mods:affiliation id="6116E8651B09A7E848E2B593911017A6">Laboratorio de Sistemática de Invertebrados Marinos (LABSIM), Universidad del Mar, campus Puerto Ángel, Ciudad Universitaria, Apdo. Postal 47, Puerto Ángel, Oaxaca, 70902, México. &amp; ms _ garcia _ m @ hotmail. com; https: // orcid. org / 0000 - 0003 - 4279 - 9116</mods:affiliation>
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<mods:namePart id="663EFFB5D6B2FF0776D9BF49BBECF9B4">Bastida-Zavala, J. Rolando</mods:namePart>
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<mods:affiliation id="AEC639B7B15ADCE2B1D2CEA3C4519909">Laboratorio de Sistemática de Invertebrados Marinos (LABSIM), Universidad del Mar, campus Puerto Ángel, Ciudad Universitaria, Apdo. Postal 47, Puerto Ángel, Oaxaca, 70902, México. &amp; rolando _ bastida @ yahoo. com. mx; https: // orcid. org / 0000 - 0003 - 4802 - 1348</mods:affiliation>
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(
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, 
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<figureCitation id="D3B1AF837647C321CDAEFF4AFE4DFF50" box="[409,486,187,213]" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">4 A–G</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CDC6FF4AFD9DFF53" box="[497,566,187,214]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A–C</figureCitation>
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locality:
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Tangolunda, 
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Bahías 
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.
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specimens. 
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as sagittal sections: UMAR-PLAT 40, reproductive structures in seven slides; 
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, 
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; in the empty shell of 
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in SEAPHOX 
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<collectionCode id="2D9B2BC37647C321C873FE9EFB21FE0C" box="[1092,1162,367,393]" pageId="3" pageNumber="304">PGRP</collectionCode>
, and 
<collectionCode id="2D9B2BC37647C321C8F1FE9EFAACFE0C" box="[1222,1287,367,393]" pageId="3" pageNumber="304">SVM</collectionCode>
). 
<typeStatus id="94310DA47647C321C92CFE9EFA3CFE0C" box="[1307,1431,367,393]" pageId="3" pageNumber="304" type="paratype">
<emphasis id="79FE6F147647C321C92CFE9EFA3CFE0C" bold="true" box="[1307,1431,367,393]" pageId="3" pageNumber="304">Paratypes</emphasis>
</typeStatus>
</materialsCitation>
<emphasis id="79FE6F147647C321C9A0FE9EFA37FE0C" bold="true" box="[1431,1436,367,393]" pageId="3" pageNumber="304">:</emphasis>
<materialsCitation id="FBE2B95B7647C321CCA0FE62FC3CFE70" ID-GBIF-Occurrence="3110293307" collectorName="One" county="Five" location="Tangolunda Bay" municipality="Tangolunda Bay" pageId="3" pageNumber="304" specimenCount="1" stateProvince="Oaxaca" typeStatus="holotype">
<collectingCounty id="A254CB8A7647C321CCA0FE62FF62FE28" box="[151,201,403,429]" pageId="3" pageNumber="304">Five</collectingCounty>
specimens as whole mounts: UMAR-PLAT 41A-D, 5 specs. (
<collectingMunicipality id="AB51297C7647C321CF84FE62FBD8FE2B" box="[947,1139,403,430]" pageId="3" pageNumber="304">Tangolunda Bay</collectingMunicipality>
, same as 
<typeStatus id="94310DA47647C321C8D8FE62FAFDFE2B" box="[1263,1366,403,430]" pageId="3" pageNumber="304" type="holotype">holotype</typeStatus>
). 
<collectorName id="E67FD6D07647C321C959FE62FA36FE28" box="[1390,1437,403,429]" pageId="3" pageNumber="304">One</collectorName>
specimen in histology sections, UMAR-PLAT 41E, 
<specimenCount id="5D8C788F7647C321CEC0FE46FCE1FE57" box="[759,842,439,466]" pageId="3" pageNumber="304" type="generic">1 spec.</specimenCount>
in the frontal section of reproductive structures in two slides (
<location id="4E55E5DD7647C321CD2AFE2AFE70FE73" LSID="urn:lsid:plazi:treatment:C32302107647C32ACCA0FF66FC25FA18:4E55E5DD7647C321CD2AFE2AFE70FE73" box="[285,475,475,502]" county="Five" municipality="Tangolunda Bay" name="Tangolunda Bay" pageId="3" pageNumber="304" stateProvince="Oaxaca">Tangolunda Bay</location>
, same as 
<typeStatus id="94310DA47647C321CE67FE2AFD1CFE73" box="[592,695,475,502]" pageId="3" pageNumber="304" type="holotype">holotype</typeStatus>
). 
<emphasis id="79FE6F147647C321CEFAFE2AFC3CFE70" bold="true" box="[717,919,475,501]" pageId="3" pageNumber="304">Other specimens</emphasis>
</materialsCitation>
<materialsCitation id="FBE2B95B7647C321CF95FE2AFEADFDE7" ID-GBIF-Occurrence="3110293303" county="Twenty-one" location="Tangolunda Bay" municipality="Tangolunda Bay" pageId="3" pageNumber="304" specimenCount="2" stateProvince="Oaxaca" typeStatus="holotype">
<emphasis id="79FE6F147647C321CF95FE2AFBBDFE70" bold="true" box="[930,1046,475,501]" pageId="3" pageNumber="304">reviewed:</emphasis>
<collectingCounty id="A254CB8A7647C321C816FE2DFB0DFE73" box="[1057,1190,476,502]" pageId="3" pageNumber="304">Twenty-one</collectingCounty>
specimens preserved in 70% ethanol: UMAR-PLAT 41F, 13 specs. fixed in 96% ethanol (damaged specimens, 
<collectingMunicipality id="AB51297C7647C321C8ACFE0EFAFDFD9F" box="[1179,1366,511,538]" pageId="3" pageNumber="304">Tangolunda Bay</collectingMunicipality>
, same as 
<typeStatus id="94310DA47647C321CC80FDD2FEB5FDBB" box="[183,286,547,574]" pageId="3" pageNumber="304" type="holotype">holotype</typeStatus>
); UMAR-PLAT 41G, 8 specs. fixed in formalin 10% (damaged specimens; 
<location id="4E55E5DD7647C321C84BFDD2FA9DFDBB" LSID="urn:lsid:plazi:treatment:C32302107647C32ACCA0FF66FC25FA18:4E55E5DD7647C321C84BFDD2FA9DFDBB" box="[1148,1334,547,574]" county="Twenty-one" municipality="Tangolunda Bay" name="Tangolunda Bay" pageId="3" pageNumber="304" stateProvince="Oaxaca">Tangolunda Bay</location>
, same as 
<typeStatus id="94310DA47647C321CCA0FDB6FF55FDE7" box="[151,254,583,610]" pageId="3" pageNumber="304" type="holotype">holotype</typeStatus>
)
</materialsCitation>
.
</paragraph>
</subSubSection>
<subSubSection id="0390E08D7647C326CCF0FD9AFE69FF50" lastPageId="4" lastPageNumber="305" pageId="3" pageNumber="304" type="description">
<paragraph id="4B35B3067647C321CCF0FD9AFDEBFD00" blockId="3.[151,1437,259,2016]" box="[199,576,619,645]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FD9AFDEBFD00" bold="true" box="[199,576,619,645]" pageId="3" pageNumber="304">Description of external features</emphasis>
</paragraph>
<paragraph id="4B35B3067647C321CCF0FD7EFE8EFCBC" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FD7EFEBBFD2C" bold="true" box="[199,272,655,681]" pageId="3" pageNumber="304">Color.</emphasis>
The background color is beige with a scant orange to light brown pigmentation; black transverse spots which, when fusing together, give the appearance of lines, mainly in the anterior marginal region of the body; nuchal tentacles orange; body margin orange or pink (
<figureCitation id="D3B1AF837647C321CE94FD26FC88FD74" box="[675,803,727,753]" captionStart="FIGURE 2" captionStartId="4.[151,250,1911,1935]" captionTargetBox="[152,1436,273,1887]" captionTargetId="figure-57@4.[152,1436,273,1887]" captionTargetPageId="4" captionText="FIGURE 2. Stylochus mistus sp. nov. A–F (paratype UMAR-PLAT 41). A–C. specimens in vivo; D. specimen preserved in ethanol; E–F. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; G. Paraconcavus pacificus. Scaling bar of the figure A, B, D–F= 1 mm, G= 1 cm." figureDoi="http://doi.org/10.5281/zenodo.4750211" httpUri="https://zenodo.org/record/4750211/files/figure.png" pageId="3" pageNumber="304">Figs 2A–C</figureCitation>
). When fixed the color is beige, with maculae, spots and small dots black or olive green (
<figureCitation id="D3B1AF837647C321CE3FFD0AFDCFFC90" box="[520,612,763,789]" captionStart="FIGURE 2" captionStartId="4.[151,250,1911,1935]" captionTargetBox="[152,1436,273,1887]" captionTargetId="figure-57@4.[152,1436,273,1887]" captionTargetPageId="4" captionText="FIGURE 2. Stylochus mistus sp. nov. A–F (paratype UMAR-PLAT 41). A–C. specimens in vivo; D. specimen preserved in ethanol; E–F. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; G. Paraconcavus pacificus. Scaling bar of the figure A, B, D–F= 1 mm, G= 1 cm." figureDoi="http://doi.org/10.5281/zenodo.4750211" httpUri="https://zenodo.org/record/4750211/files/figure.png" pageId="3" pageNumber="304">Fig. 2D</figureCitation>
); and when stained with Mayer´s carmalum it has a purple to pink color (
<figureCitation id="D3B1AF837647C321CCA8FCEEFEB2FCBC" box="[159,281,799,825]" captionStart="FIGURE 2" captionStartId="4.[151,250,1911,1935]" captionTargetBox="[152,1436,273,1887]" captionTargetId="figure-57@4.[152,1436,273,1887]" captionTargetPageId="4" captionText="FIGURE 2. Stylochus mistus sp. nov. A–F (paratype UMAR-PLAT 41). A–C. specimens in vivo; D. specimen preserved in ethanol; E–F. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; G. Paraconcavus pacificus. Scaling bar of the figure A, B, D–F= 1 mm, G= 1 cm." figureDoi="http://doi.org/10.5281/zenodo.4750211" httpUri="https://zenodo.org/record/4750211/files/figure.png" pageId="3" pageNumber="304">Figs 2E–F</figureCitation>
).
</paragraph>
<paragraph id="4B35B3067647C321CCF0FCB2FBE4FC04" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FCB2FEBAFCD8" bold="true" box="[199,273,835,861]" pageId="3" pageNumber="304">Form.</emphasis>
Oblong shape or slightly pyriform (after to fixed) (
<figureCitation id="D3B1AF837647C321CF73FCB2FC17FCD8" box="[836,956,835,861]" captionStart="FIGURE 2" captionStartId="4.[151,250,1911,1935]" captionTargetBox="[152,1436,273,1887]" captionTargetId="figure-57@4.[152,1436,273,1887]" captionTargetPageId="4" captionText="FIGURE 2. Stylochus mistus sp. nov. A–F (paratype UMAR-PLAT 41). A–C. specimens in vivo; D. specimen preserved in ethanol; E–F. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; G. Paraconcavus pacificus. Scaling bar of the figure A, B, D–F= 1 mm, G= 1 cm." figureDoi="http://doi.org/10.5281/zenodo.4750211" httpUri="https://zenodo.org/record/4750211/files/figure.png" pageId="3" pageNumber="304">Figs 2A–F</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CFF2FCB2FC42FCD8" box="[965,1001,835,861]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">3A</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CFC3FCB2FBB2FCDB" box="[1012,1049,835,862]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A</figureCitation>
), measuring between 
<quantity id="8C721EE37647C321C93DFCB2FACEFCDB" box="[1290,1381,835,862]" metricMagnitude="-3" metricUnit="m" metricValue="5.5" metricValueMax="9.0" metricValueMin="2.0" pageId="3" pageNumber="304" unit="mm" value="5.5" valueMax="9.0" valueMin="2.0">2–9 mm</quantity>
long (n=26, µ= 
<quantity id="8C721EE37647C321CD38FC96FEDEFC07" box="[271,373,871,898]" metricMagnitude="-3" metricUnit="m" metricValue="4.77" pageId="3" pageNumber="304" unit="mm" value="4.77">4.77 mm</quantity>
, SD= 1.79) and 
<quantity id="8C721EE37647C321CE1BFC96FD0EFC07" box="[556,677,871,898]" metricMagnitude="-3" metricUnit="m" metricValue="3.1" metricValueMax="5.2" metricValueMin="1.0" pageId="3" pageNumber="304" unit="mm" value="3.1" valueMax="5.2" valueMin="1.0">1– 5.2 mm</quantity>
(n=26, µ= 
<quantity id="8C721EE37647C321CF13FC96FC21FC07" box="[804,906,871,898]" metricMagnitude="-3" metricUnit="m" metricValue="2.77" pageId="3" pageNumber="304" unit="mm" value="2.77">2.77 mm</quantity>
, SD= 1.07) wide.
</paragraph>
<paragraph id="4B35B3067647C321CCF0FC7AFC53FC68" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FC7AFE96FC20" bold="true" box="[199,317,907,933]" pageId="3" pageNumber="304">Tentacles.</emphasis>
Circular to pyriform nuchal tentacles (
<figureCitation id="D3B1AF837647C321CF3CFC7AFCC0FC20" box="[779,875,907,933]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Figs 3C</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CF4CFC7AFC0BFC23" box="[891,928,907,934]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A</figureCitation>
), positioned between 
<quantity id="8C721EE37647C321C895FC7AFA86FC23" box="[1186,1325,907,934]" metricMagnitude="-3" metricUnit="m" metricValue="1.0" metricValueMax="1.2" metricValueMin="0.8" pageId="3" pageNumber="304" unit="mm" value="1.0" valueMax="1.2" valueMin="0.8">0.8–1.2 mm</quantity>
from the anterior margin of the body. They measure 
<quantity id="8C721EE37647C321CEB0FC5EFCB5FC4F" box="[647,798,943,970]" metricMagnitude="-4" metricUnit="m" metricValue="2.75" metricValueMax="3.0" metricValueMin="2.5" pageId="3" pageNumber="304" unit="mm" value="0.275" valueMax="0.3" valueMin="0.25">0.25–0.3 mm</quantity>
in length (n=4, µ= 
<quantity id="8C721EE37647C321C836FC5EFBC2FC4F" box="[1025,1129,943,970]" metricMagnitude="-4" metricUnit="m" metricValue="2.7" pageId="3" pageNumber="304" unit="mm" value="0.27">0.27 mm</quantity>
, SD= 0.02) and 
<quantity id="8C721EE37647C321C911FC5EFAD5FC4F" box="[1318,1406,943,970]" metricMagnitude="-4" metricUnit="m" metricValue="2.0" pageId="3" pageNumber="304" unit="mm" value="0.2">0.2 mm</quantity>
in width (n=4, µ= 
<quantity id="8C721EE37647C321CD7FFC22FE0BFC6B" box="[328,416,979,1006]" metricMagnitude="-4" metricUnit="m" metricValue="2.0" pageId="3" pageNumber="304" unit="mm" value="0.2">0.2 mm</quantity>
, SD= 0.02) and with 
<quantity id="8C721EE37647C321CEA7FC22FD4DFC6B" box="[656,742,979,1006]" metricMagnitude="-4" metricUnit="m" metricValue="5.0" pageId="3" pageNumber="304" unit="mm" value="0.5">0.5 mm</quantity>
intertentacular distance.
</paragraph>
<paragraph id="4B35B3067647C321CCF0FC06FCB5FB43" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FC06FEADFB94" bold="true" box="[199,262,1015,1041]" pageId="3" pageNumber="304">Eyes.</emphasis>
About 90 to 295 (n=4, µ= 156, SD= 94) marginal eyes (
<figureCitation id="D3B1AF837647C321CF4AFC06FC73FB94" box="[893,984,1015,1041]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Figs 3B</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CFD3FC06FBACFB97" box="[996,1031,1015,1042]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A</figureCitation>
) distributed in the anterior marginal region of the body; between 15–49 (n=4, µ= 28, SD= 16) tentacular eyes (
<figureCitation id="D3B1AF837647C321CFDFFBEAFBCDFBB0" box="[1000,1126,1051,1077]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Figs 3B–C</figureCitation>
, 
<figureCitation id="D3B1AF837647C321C844FBEAFB3DFBB3" box="[1139,1174,1051,1078]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A</figureCitation>
) mostly located within the nuchal tentacles and one or two pairs of these located in the marginal-posterior region of the tentacles; between 26–59 (n=4, µ= 35, SD= 13) cerebral eyes arranged in two lines (
<figureCitation id="D3B1AF837647C321CF42FB92FC59FBF8" box="[885,1010,1123,1149]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Figs 3B–C</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CFCAFB92FB89FBFB" box="[1021,1058,1123,1150]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A</figureCitation>
), located anterior to the brain and oriented towards the anterior region of the body; few frontal eyes (
<figureCitation id="D3B1AF837647C321CFADFB76FC5FFB24" box="[922,1012,1159,1185]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Fig. 3B</figureCitation>
, 
<figureCitation id="D3B1AF837647C321C835FB76FB8EFB27" box="[1026,1061,1159,1186]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A</figureCitation>
) distributed towards the anterior region of the body, arranged slightly in a fan-like manner.
</paragraph>
<paragraph id="4B35B3067647C321CCF0FB3EFD2AFA88" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FB3EFEB8FB6C" bold="true" box="[199,275,1231,1257]" pageId="3" pageNumber="304">Brain.</emphasis>
Oval, measuring 
<quantity id="8C721EE37647C321CDE3FB3EFD83FB6F" box="[468,552,1231,1258]" metricMagnitude="-4" metricUnit="m" metricValue="3.0" pageId="3" pageNumber="304" unit="mm" value="0.3">0.3 mm</quantity>
in length and 
<quantity id="8C721EE37647C321CE88FB3EFCB8FB6F" box="[703,787,1231,1258]" metricMagnitude="-4" metricUnit="m" metricValue="2.0" pageId="3" pageNumber="304" unit="mm" value="0.2">0.2 mm</quantity>
width, with scarcely visible globuli cell masses, positioned in the anterior region of the brain (
<figureCitation id="D3B1AF837647C321CE2DFB02FDDFFA88" box="[538,628,1267,1293]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Fig. 3D</figureCitation>
).
</paragraph>
<paragraph id="4B35B3067647C321CCF0FAE6FAADFAFC" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FAE6FE39FAB4" bold="true" box="[199,402,1303,1329]" pageId="3" pageNumber="304">Digestive system.</emphasis>
Folded pharynx (
<figureCitation id="D3B1AF837647C321CE61FAE6FD1BFAB4" box="[598,688,1303,1329]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Figs 3E</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CE8CFAE6FD74FAB7" box="[699,735,1303,1330]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A</figureCitation>
), 
<quantity id="8C721EE37647C321CEC3FAE6FCCEFAB7" box="[756,869,1303,1330]" metricMagnitude="-3" metricUnit="m" metricValue="2.8" metricValueMax="3.6" metricValueMin="2.0" pageId="3" pageNumber="304" unit="mm" value="2.8" valueMax="3.6" valueMin="2.0">2–3.6 mm</quantity>
long (n=4, µ= 
<quantity id="8C721EE37647C321C83CFAE6FBC9FAB7" box="[1035,1122,1303,1330]" metricMagnitude="-3" metricUnit="m" metricValue="2.9" pageId="3" pageNumber="304" unit="mm" value="2.9">2.9 mm</quantity>
, SD= 0.76) and 
<quantity id="8C721EE37647C321C921FAE6FA36FAB7" box="[1302,1437,1303,1330]" metricMagnitude="-3" metricUnit="m" metricValue="1.7" metricValueMax="2.2" metricValueMin="1.2" pageId="3" pageNumber="304" unit="mm" value="1.7" valueMax="2.2" valueMin="1.2">1.2–2.2 mm</quantity>
(n=4, µ= 
<quantity id="8C721EE37647C321CD36FACAFEF2FAD3" box="[257,345,1339,1366]" metricMagnitude="-3" metricUnit="m" metricValue="1.5" pageId="3" pageNumber="304" unit="mm" value="1.5">1.5 mm</quantity>
, SD= 0.42) wide, located at 
<quantity id="8C721EE37647C321CEAFFACAFD44FAD3" box="[664,751,1339,1366]" metricMagnitude="-3" metricUnit="m" metricValue="2.2" pageId="3" pageNumber="304" unit="mm" value="2.2">2.2 mm</quantity>
from the anterior margin of the body; with 6–7 (n=4, µ= 6.8, SD= 0.4) pharyngeal lobes. The mouth is located at the end of the first third of the pharynx (
<figureCitation id="D3B1AF837647C321C895FAAEFB52FAFC" box="[1186,1273,1375,1401]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Fig. 3E</figureCitation>
).
</paragraph>
<paragraph id="4B35B3067647C321CCF0FA72FDC6FA63" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FA72FEFBFA18" bold="true" box="[199,336,1411,1437]" pageId="3" pageNumber="304">Gonopores.</emphasis>
Separated gonopores, positioned at the end of the last third of the body; the male gonopore is at a distance of 
<quantity id="8C721EE37647C321CD18FA56FE09FA47" box="[303,418,1447,1474]" metricMagnitude="-3" metricUnit="m" metricValue="5.85" metricValueMax="6.0" metricValueMin="5.7" pageId="3" pageNumber="304" unit="mm" value="5.85" valueMax="6.0" valueMin="5.7">5.7–6 mm</quantity>
from the anterior margin of the body, at 
<quantity id="8C721EE37647C321CF44FA56FC61FA47" box="[883,970,1447,1474]" metricMagnitude="-3" metricUnit="m" metricValue="1.4" pageId="3" pageNumber="304" unit="mm" value="1.4">1.4 mm</quantity>
from the pharynx and 
<quantity id="8C721EE37647C321C8F8FA56FA9FFA47" box="[1231,1332,1447,1474]" metricMagnitude="-5" metricUnit="m" metricValue="5.0" pageId="3" pageNumber="304" unit="mm" value="0.05">0.05 mm</quantity>
from the female gonopore (
<figureCitation id="D3B1AF837647C321CD54FA3AFE75FA60" box="[355,478,1483,1509]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Figs 3F–G</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CDDEFA3AFDA5FA60" box="[489,526,1483,1509]" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">4A</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CE2DFA3AFDCAFA63" box="[538,609,1483,1510]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5A–C</figureCitation>
).
</paragraph>
<paragraph id="4B35B3067647C321CCF0FA1EFDDCF98C" blockId="3.[151,1437,259,2016]" box="[199,631,1519,1545]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0FA1EFDDCF98C" bold="true" box="[199,631,1519,1545]" pageId="3" pageNumber="304">Description of reproductive features</emphasis>
</paragraph>
<paragraph id="4B35B3067647C321CCF0F9E2FC5DF880" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0F9E2FDA2F9A8" bold="true" box="[199,521,1555,1581]" pageId="3" pageNumber="304">Male reproductive system.</emphasis>
Male gonopore almost terminal; the rest of male reproductive system oriented towards anteriorly from male gonopore; it presents spermiducal ducts which are oriented towards the anterior region of the body and extend to the second third of the pharynx, to descend later to the posterior region of the body. Prostatic vesicle prominent, oval and polyglandular (
<figureCitation id="D3B1AF837647C321CEC5F98EFC90F91C" box="[754,827,1663,1689]" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">Figs 4</figureCitation>
A-B, E, 5B–C), located dorsal to the seminal vesicle. Seminal vesicle elongated and prominent (
<figureCitation id="D3B1AF837647C321CE4FF952FD44F938" box="[632,751,1699,1725]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Figs 3E–F</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CECCF952FCEAF938" box="[763,833,1699,1725]" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">4A–B</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CF7AF952FCDBF93B" box="[845,880,1699,1726]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5C</figureCitation>
), connected through the spermiducal ducts to the spermiducal vesicles (
<figureCitation id="D3B1AF837647C321CDA7F936FE45F964" box="[400,494,1735,1761]" captionStart="FIGURE 3" captionStartId="5.[151,250,1772,1796]" captionTargetBox="[155,1432,181,1748]" captionTargetId="figure-17@5.[155,1432,181,1748]" captionTargetPageId="5" captionText="FIGURE 3. Stylochus mistus sp. nov. A–G (paratype UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm." figureDoi="http://doi.org/10.5281/zenodo.4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="3" pageNumber="304">Figs 3G</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CDCDF936FDB4F967" box="[506,543,1735,1762]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5C</figureCitation>
). Penis papilla short (
<figureCitation id="D3B1AF837647C321CF23F936FCC7F964" box="[788,876,1735,1761]" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">Fig. 4C</figureCitation>
), 
<quantity id="8C721EE37647C321CFB5F936FC68F967" box="[898,963,1735,1762]" metricMagnitude="-3" metricUnit="m" metricValue="1.0" pageId="3" pageNumber="304" unit="mm" value="1.0">1 mm</quantity>
long, unarmed; narrow male atrium (
<figureCitation id="D3B1AF837647C321C95DF936FF6FF880" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">Figs 4–F</figureCitation>
) with a glandular epithelium lining (
<figureCitation id="D3B1AF837647C321CE68F91AFD72F880" box="[607,729,1771,1797]" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">Figs 4D–F</figureCitation>
) in the peripheral region.
</paragraph>
<paragraph id="4B35B3067647C321CCF0F8FEFD3AF810" blockId="3.[151,1437,259,2016]" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0F8FEFD89F8AC" bold="true" box="[199,546,1807,1833]" pageId="3" pageNumber="304">Female reproductive system.</emphasis>
Oviducts (
<figureCitation id="D3B1AF837647C321CE95F8FEFCAAF8AC" box="[674,769,1807,1833]" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">Figs 4C</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CF38F8FEFC9BF8AF" box="[783,816,1807,1834]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5C</figureCitation>
) run from the anterior region of the body, around the pharynx, and connect directly with the proximal end of the vagina. Scarcely developed, narrow and short vagina, oriented towards the anterior region of the body (
<figureCitation id="D3B1AF837647C321CE80F8A6FC9EF8F4" box="[695,821,1879,1905]" captionStart="FIGURE 4" captionStartId="6.[151,250,1772,1796]" captionTargetBox="[157,1431,181,1748]" captionTargetId="figure-23@6.[157,1431,181,1748]" captionTargetPageId="6" captionText="FIGURE 4. Stylochus mistus sp. nov. A. (paratype UMAR-PLAT 41), B–G. (holotype UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular.Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="3" pageNumber="304">Figs 4C–D</figureCitation>
, 
<figureCitation id="D3B1AF837647C321CF08F8A6FCCFF8F7" box="[831,868,1879,1906]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">5C</figureCitation>
). Cement glands (
<figureCitation id="D3B1AF837647C321C81BF8A6FB2AF8F7" box="[1068,1153,1879,1906]" captionStart="FIGURE 5" captionStartId="7.[151,250,1758,1782]" captionTargetBox="[192,1405,214,1714]" captionTargetId="figure-17@7.[152,1435,181,1722]" captionTargetPageId="7" captionText="FIGURE 5. Stylochus mistus sp. nov. A–B. (paratype UMAR-PLAT 41), C. (holotype UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina." figureDoi="http://doi.org/10.5281/zenodo.4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="3" pageNumber="304">Fig. 5C</figureCitation>
) are scarce and are found surrounding the vagina; lacks Lang’s vesicle.
</paragraph>
<paragraph id="4B35B3067647C326CCF0F86EFE69FF50" blockId="3.[151,1437,259,2016]" lastBlockId="4.[151,1436,151,249]" lastPageId="4" lastPageNumber="305" pageId="3" pageNumber="304">
<emphasis id="79FE6F147647C321CCF0F86EFE81F83C" bold="true" box="[199,298,1951,1977]" pageId="3" pageNumber="304">Habitat.</emphasis>
The polyclads were found inside the shells of 
<taxonomicName id="8C8AC8857647C321CF7AF851FBF7F83C" authorityName="Hurley" authorityYear="1975" baseAuthorityName="Pilsbry" baseAuthorityYear="1916" box="[845,1116,1951,1977]" class="Maxillopoda" family="Balanidae" genus="Paraconcavus" kingdom="Animalia" order="Sessilia" pageId="3" pageNumber="304" phylum="Arthropoda" rank="species" species="pacificus">
<emphasis id="79FE6F147647C321CF7AF851FBF7F83C" box="[845,1116,1951,1977]" italics="true" pageId="3" pageNumber="304">Paraconcavus pacificus</emphasis>
</taxonomicName>
(
<figureCitation id="D3B1AF837647C321C859F86EFB67F83C" box="[1134,1228,1951,1977]" captionStart="FIGURE 2" captionStartId="4.[151,250,1911,1935]" captionTargetBox="[152,1436,273,1887]" captionTargetId="figure-57@4.[152,1436,273,1887]" captionTargetPageId="4" captionText="FIGURE 2. Stylochus mistus sp. nov. A–F (paratype UMAR-PLAT 41). A–C. specimens in vivo; D. specimen preserved in ethanol; E–F. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; G. Paraconcavus pacificus. Scaling bar of the figure A, B, D–F= 1 mm, G= 1 cm." figureDoi="http://doi.org/10.5281/zenodo.4750211" httpUri="https://zenodo.org/record/4750211/files/figure.png" pageId="3" pageNumber="304">Fig. 2G</figureCitation>
), which were part of the fouling of a marine sensor (SeapHOx®), at a depth of approximately 
<quantity id="8C721EE37647C321C83BF832FBDEF85B" box="[1036,1141,1987,2014]" metricMagnitude="1" metricUnit="m" metricValue="2.25" metricValueMax="2.5" metricValueMin="2.0" pageId="3" pageNumber="304" unit="m" value="22.5" valueMax="25.0" valueMin="20.0">
20– 
<specimenCount id="5D8C788F7647C321C800F832FBDEF85B" box="[1079,1141,1987,2014]" pageId="3" pageNumber="304" type="generic">25 m</specimenCount>
</quantity>
. The sensor was installed on 
<date id="3F3495C67640C326CC8CFF66FE25FF34" box="[187,398,151,177]" pageId="4" pageNumber="305" value="2016-12-06">December 6, 2016</date>
, and extracted on 
<date id="3F3495C67640C326CE6BFF66FCAEFF34" box="[604,773,151,177]" pageId="4" pageNumber="305" value="2017-03-07">March 7, 2017</date>
; the dominant fouling fauna was represented by barnacles, decapods and polychaetes.
</paragraph>
</subSubSection>
<subSubSection id="0390E08D7640C326CCF0FF2FFAEEFF7C" box="[199,1349,222,249]" pageId="4" pageNumber="305" type="distribution">
<paragraph id="4B35B3067640C326CCF0FF2FFAEEFF7C" blockId="4.[151,1436,151,249]" box="[199,1349,222,249]" pageId="4" pageNumber="305">
<emphasis id="79FE6F147640C326CCF0FF2FFECAFF7D" bold="true" box="[199,353,222,248]" pageId="4" pageNumber="305">Distribution.</emphasis>
Tropical Eastern Pacific. Central coast of 
<collectingRegion id="894E7DE47640C326CF0CFF2EFC38FF7C" box="[827,915,223,249]" country="Mexico" name="Oaxaca" pageId="4" pageNumber="305">Oaxaca</collectingRegion>
: Tangolunda Bay, Bahías de Huatulco.
</paragraph>
</subSubSection>
<caption id="1FF5E38E7640C326CCA0F886FD94F852" ID-DOI="http://doi.org/10.5281/zenodo.4750211" ID-Zenodo-Dep="4750211" httpUri="https://zenodo.org/record/4750211/files/figure.png" pageId="4" pageNumber="305" startId="4.[151,250,1911,1935]" targetBox="[152,1436,273,1887]" targetPageId="4">
<paragraph id="4B35B3067640C326CCA0F886FD94F852" blockId="4.[151,1437,1911,2008]" pageId="4" pageNumber="305">
<emphasis id="79FE6F147640C326CCA0F886FEBFF815" bold="true" box="[151,276,1911,1936]" pageId="4" pageNumber="305">FIGURE 2.</emphasis>
<taxonomicName id="8C8AC8857640C326CD2BF889FE6DF80A" authority="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala, 2021" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[284,454,1912,1936]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="4" pageNumber="305" phylum="Platyhelminthes" rank="species" species="mistus" status="sp. nov.">
<emphasis id="79FE6F147640C326CD2BF889FE6DF80A" box="[284,454,1912,1936]" italics="true" pageId="4" pageNumber="305">Stylochus mistus</emphasis>
</taxonomicName>
<emphasis id="79FE6F147640C326CDFAF889FDB4F815" bold="true" box="[461,543,1912,1936]" pageId="4" pageNumber="305">
<taxonomicNameLabel id="62CDD26F7640C326CDFAF889FDB4F815" box="[461,543,1912,1936]" pageId="4" pageNumber="305" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
A–F 
<emphasis id="79FE6F147640C326CE6BF886FD6DF80A" bold="true" box="[604,710,1911,1935]" pageId="4" pageNumber="305">(paratype</emphasis>
UMAR-PLAT 41). A–C. specimens 
<emphasis id="79FE6F147640C326C874F889FB23F80A" box="[1091,1160,1912,1935]" italics="true" pageId="4" pageNumber="305">in vivo</emphasis>
; D. specimen preserved in ethanol; E–F. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; G. 
<taxonomicName id="8C8AC8857640C326C81EF86DFAB7F831" authorityName="Hurley" authorityYear="1975" baseAuthorityName="Pilsbry" baseAuthorityYear="1916" box="[1065,1308,1948,1972]" class="Maxillopoda" family="Balanidae" genus="Paraconcavus" kingdom="Animalia" order="Sessilia" pageId="4" pageNumber="305" phylum="Arthropoda" rank="species" species="pacificus">
<emphasis id="79FE6F147640C326C81EF86DFAB7F831" box="[1065,1308,1948,1972]" italics="true" pageId="4" pageNumber="305">Paraconcavus pacificus</emphasis>
</taxonomicName>
. Scaling bar of the figure A, B, D–F= 1 mm, G= 1 cm.
</paragraph>
</caption>
<caption id="1FF5E38E7641C327CCA0F91DFCB2F811" ID-DOI="http://doi.org/10.5281/zenodo.4750213" ID-Zenodo-Dep="4750213" httpUri="https://zenodo.org/record/4750213/files/figure.png" pageId="5" pageNumber="306" startId="5.[151,250,1772,1796]" targetBox="[155,1432,181,1748]" targetPageId="5">
<paragraph id="4B35B3067641C327CCA0F91DFCB2F811" blockId="5.[151,1437,1772,1941]" pageId="5" pageNumber="306">
<emphasis id="79FE6F147641C327CCA0F91DFEBEF881" bold="true" box="[151,277,1772,1796]" pageId="5" pageNumber="306">FIGURE 3.</emphasis>
<taxonomicName id="8C8AC8857641C327CD2AF91DFE6CF881" authority="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala, 2021" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[285,455,1772,1796]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="5" pageNumber="306" phylum="Platyhelminthes" rank="species" species="mistus" status="sp. nov.">
<emphasis id="79FE6F147641C327CD2AF91DFE6CF881" box="[285,455,1772,1796]" italics="true" pageId="5" pageNumber="306">Stylochus mistus</emphasis>
</taxonomicName>
<emphasis id="79FE6F147641C327CDF8F91DFD8AF881" bold="true" box="[463,545,1772,1796]" pageId="5" pageNumber="306">
<taxonomicNameLabel id="62CDD26F7641C327CDF8F91DFD8AF881" box="[463,545,1772,1796]" pageId="5" pageNumber="306" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
A–G (
<emphasis id="79FE6F147641C327CE5CF91DFD67F881" bold="true" box="[619,716,1772,1796]" pageId="5" pageNumber="306">paratype</emphasis>
UMAR-PLAT 41). A–G. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; B–G. details of A, in whole mount; B–C. anterior region of the body, D. brain; E. pharynx; F–G. male and female reproductive system. Structures: b= brain, ce= cerebral eyes, fe= frontal eyes, fg= female gonopore, m= mouth, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes. Scaling bar of the figure A= 1 mm.
</paragraph>
</caption>
<caption id="1FF5E38E7642C324CCA0F91DFBD4F8F5" ID-DOI="http://doi.org/10.5281/zenodo.4750215" ID-Zenodo-Dep="4750215" httpUri="https://zenodo.org/record/4750215/files/figure.png" pageId="6" pageNumber="307" startId="6.[151,250,1772,1796]" targetBox="[157,1431,181,1748]" targetPageId="6">
<paragraph id="4B35B3067642C324CCA0F91DFBD4F8F5" blockId="6.[151,1437,1772,1904]" pageId="6" pageNumber="307">
<emphasis id="79FE6F147642C324CCA0F91DFEB9F881" bold="true" box="[151,274,1772,1796]" pageId="6" pageNumber="307">FIGURE 4.</emphasis>
<taxonomicName id="8C8AC8857642C324CD2FF91DFE6BF881" authority="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala, 2021" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[280,448,1772,1796]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="6" pageNumber="307" phylum="Platyhelminthes" rank="species" species="mistus" status="sp. nov.">
<emphasis id="79FE6F147642C324CD2FF91DFE6BF881" box="[280,448,1772,1796]" italics="true" pageId="6" pageNumber="307">Stylochus mistus</emphasis>
</taxonomicName>
<emphasis id="79FE6F147642C324CDF1F91DFDBDF881" bold="true" box="[454,534,1772,1796]" pageId="6" pageNumber="307">
<taxonomicNameLabel id="62CDD26F7642C324CDF1F91DFDBDF881" box="[454,534,1772,1796]" pageId="6" pageNumber="307" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
A. (
<emphasis id="79FE6F147642C324CE74F91DFD0FF881" bold="true" box="[579,676,1772,1796]" pageId="6" pageNumber="307">paratype</emphasis>
UMAR-PLAT 41), B–G. (
<emphasis id="79FE6F147642C324CF85F91DFBA4F881" bold="true" box="[946,1039,1772,1796]" pageId="6" pageNumber="307">holotype</emphasis>
UMAR-PLAT 40). A. male and female reproductive system, in frontal histological sections; B–G. male and female reproductive system, in sagittal sections; E. prostatic vesicle of type polyglandular. Structures: fg= female gonopore, gp= glandular epithelium, ma= male atrium, mg= male gonopore, ovi= oviducts, pp= penis papilla, pv= prostatic vesicle, sv= seminal vesicle, u= uterus, va= vagina.
</paragraph>
</caption>
<caption id="1FF5E38E7643C325CCA0F92FFC19F82F" ID-DOI="http://doi.org/10.5281/zenodo.4750217" ID-Zenodo-Dep="4750217" httpUri="https://zenodo.org/record/4750217/files/figure.png" pageId="7" pageNumber="308" startId="7.[151,250,1758,1782]" targetBox="[192,1405,214,1714]" targetPageId="7">
<paragraph id="4B35B3067643C325CCA0F92FFC19F82F" blockId="7.[151,1437,1758,1963]" pageId="7" pageNumber="308">
<emphasis id="79FE6F147643C325CCA0F92FFEBFF973" bold="true" box="[151,276,1758,1782]" pageId="7" pageNumber="308">FIGURE 5.</emphasis>
<taxonomicName id="8C8AC8857643C325CD2BF92FFE6DF973" authority="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala, 2021" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[284,454,1758,1782]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="7" pageNumber="308" phylum="Platyhelminthes" rank="species" species="mistus" status="sp. nov.">
<emphasis id="79FE6F147643C325CD2BF92FFE6DF973" box="[284,454,1758,1782]" italics="true" pageId="7" pageNumber="308">Stylochus mistus</emphasis>
</taxonomicName>
<emphasis id="79FE6F147643C325CDFAF92FFDB4F973" bold="true" box="[461,543,1758,1782]" pageId="7" pageNumber="308">
<taxonomicNameLabel id="62CDD26F7643C325CDFAF92FFDB4F973" box="[461,543,1758,1782]" pageId="7" pageNumber="308" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
A–B. (
<emphasis id="79FE6F147643C325CE5AF92FFD65F973" bold="true" box="[621,718,1758,1782]" pageId="7" pageNumber="308">paratype</emphasis>
UMAR-PLAT 41), C. (
<emphasis id="79FE6F147643C325CFF1F92FFB88F973" bold="true" box="[966,1059,1758,1782]" pageId="7" pageNumber="308">holotype</emphasis>
UMAR-PLAT 40). A. diagrammatic representation of complete specimen; B. diagrammatic representation of the male and female reproductive systems, in whole mount; C. diagrammatic representation of the male and female reproductive systems, in sagittal section. Structures: ce= cerebral eyes, cg=cement gland, ed=ejaculatory duct, fe= frontal eyes, fg= female gonopore, gp= glandular epithelium, me= marginal eyes, mg= male gonopore, nt= nuchal tentacle, ovi= oviducts p= pharynx, pv= prostatic vesicle, sv= seminal vesicle, spv= spermiducal vesicle, te= tentacular eyes, ovi= oviducts, u= uterus, va= vagina.
</paragraph>
</caption>
<subSubSection id="0390E08D764CC32ACCF0FF66FC25FA18" pageId="8" pageNumber="309" type="etymology">
<paragraph id="4B35B306764CC32ACCF0FF66FCC9FF7C" blockId="8.[151,1437,151,1437]" pageId="8" pageNumber="309">
<emphasis id="79FE6F14764CC32ACCF0FF66FEE5FF34" bold="true" box="[199,334,151,177]" pageId="8" pageNumber="309">Etymology.</emphasis>
The specific epithet, 
<taxonomicName id="8C8AC885764CC32ACE08FF66FD2CFF35" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[575,647,151,176]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="mistus">
<emphasis id="79FE6F14764CC32ACE08FF66FD2CFF35" box="[575,647,151,176]" italics="true" pageId="8" pageNumber="309">mistus</emphasis>
</taxonomicName>
, derives from the Zapotec subdialect word 
<emphasis id="79FE6F14764CC32AC859FF66FB1FFF34" box="[1134,1204,151,177]" italics="true" pageId="8" pageNumber="309">mistu’</emphasis>
, which means “cat”, in reference to the color and dorsal color pattern of the specimens (
<figureCitation id="D3B1AF83764CC32ACFAAFF4AFBB5FF50" box="[925,1054,187,213]" captionStart="FIGURE 2" captionStartId="4.[151,250,1911,1935]" captionTargetBox="[152,1436,273,1887]" captionTargetId="figure-57@4.[152,1436,273,1887]" captionTargetPageId="4" captionText="FIGURE 2. Stylochus mistus sp. nov. A–F (paratype UMAR-PLAT 41). A–C. specimens in vivo; D. specimen preserved in ethanol; E–F. specimen stained in Mayer´s carmalum and cleared in methyl salicylate; G. Paraconcavus pacificus. Scaling bar of the figure A, B, D–F= 1 mm, G= 1 cm." figureDoi="http://doi.org/10.5281/zenodo.4750211" httpUri="https://zenodo.org/record/4750211/files/figure.png" pageId="8" pageNumber="309">Figs 2A–C</figureCitation>
), a pattern similar to the wild cat 
<taxonomicName id="8C8AC885764CC32ACCA0FF2EFE04FF7C" authority="Schinz" authorityName="Schinz" box="[151,431,223,249]" class="Mammalia" family="Felidae" genus="Leopardus" kingdom="Animalia" order="Carnivora" pageId="8" pageNumber="309" phylum="Chordata" rank="species" species="wiedii">
<emphasis id="79FE6F14764CC32ACCA0FF2EFEF2FF7C" box="[151,345,223,249]" italics="true" pageId="8" pageNumber="309">Leopardus wiedii</emphasis>
Schinz
</taxonomicName>
, distributed along the coast of 
<collectingRegion id="894E7DE4764CC32ACF30FF2EFCF4FF7C" box="[775,863,223,249]" country="Mexico" name="Oaxaca" pageId="8" pageNumber="309">Oaxaca</collectingRegion>
.
</paragraph>
<paragraph id="4B35B306764CC32ACCF0FEF3FEF9FE28" blockId="8.[151,1437,151,1437]" pageId="8" pageNumber="309">
<emphasis id="79FE6F14764CC32ACCF0FEF3FE16FE98" bold="true" box="[199,445,258,285]" pageId="8" pageNumber="309">Taxonomic remarks:</emphasis>
<bibRefCitation id="2F1BCEF7764CC32ACDF5FEF2FC1BFE9B" author="Du Bois-Reymond Marcus, E. &amp; Marcus, E." box="[450,944,259,286]" pageId="8" pageNumber="309" pagination="1 - 134" refId="ref8658" refString="Du Bois-Reymond Marcus, E. &amp; Marcus, E. (1968) Polycladida from Curacao and faunistically related regions. Studies on the Fauna Curacao and other Caribbean Islands, 26, 1 - 134. https: // repository. naturalis. nl / pub / 506072" type="journal article" year="1968">Du Bois-Reymond Marcus &amp; Marcus (1968)</bibRefCitation>
established two subgenera within 
<taxonomicName id="8C8AC885764CC32AC91EFEF2FA3FFE98" authorityName="Ehrenberg" authorityYear="1831" box="[1321,1428,259,285]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32AC91EFEF2FA3FFE98" box="[1321,1428,259,285]" italics="true" pageId="8" pageNumber="309">Stylochus</emphasis>
</taxonomicName>
: 
<emphasis id="79FE6F14764CC32ACCA0FED6FF0EFEC4" box="[151,165,295,321]" italics="true" pageId="8" pageNumber="309">S</emphasis>
. (
<taxonomicName id="8C8AC885764CC32ACC89FED6FE82FEC4" authorityName="Ehrenberg" authorityYear="1831" box="[190,297,295,321]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32ACC89FED6FE82FEC4" box="[190,297,295,321]" italics="true" pageId="8" pageNumber="309">Stylochus</emphasis>
</taxonomicName>
) and 
<emphasis id="79FE6F14764CC32ACD5AFED6FE28FEC4" box="[365,387,295,321]" italics="true" pageId="8" pageNumber="309">S.</emphasis>
(
<taxonomicName id="8C8AC885764CC32ACDA2FED6FE5AFEC5" box="[405,497,295,320]" class="Rhabditophora" family="Stylochidae" genus="Imogine" higherTaxonomySource="GBIF" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32ACDA2FED6FE5AFEC5" box="[405,497,295,320]" italics="true" pageId="8" pageNumber="309">Imogine</emphasis>
</taxonomicName>
), based on the shape of the seminal vesicle. The first subgenus has a simple thinwalled seminal vesicle, while 
<emphasis id="79FE6F14764CC32ACDDCFEBAFDABFEE0" box="[491,512,331,357]" italics="true" pageId="8" pageNumber="309">S.</emphasis>
(
<taxonomicName id="8C8AC885764CC32ACE26FEBAFDC6FEE1" box="[529,621,331,356]" class="Rhabditophora" family="Stylochidae" genus="Imogine" higherTaxonomySource="GBIF" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32ACE26FEBAFDC6FEE1" box="[529,621,331,356]" italics="true" pageId="8" pageNumber="309">Imogine</emphasis>
</taxonomicName>
) has on anchor-shaped (tripartite) seminal vesicle. 
<bibRefCitation id="2F1BCEF7764CC32AC887FEBAFF49FE0F" author="Jennings, K. A. &amp; Newman, L. J." pageId="8" pageNumber="309" pagination="493 - 508" refId="ref10049" refString="Jennings, K. A. &amp; Newman, L. J. (1996) Four new Stylochid flatworms (Platyhelminthes: Polycladida) associated with commercial oysters from Moreton Bay, southeast Queensland, Australia. The Raffles Bulletin of Zoology, 44, 493 - 508. [https: // lkcnhm. nus. edu. sg / app / uploads / 2017 / 06 / 44 rbz 493 - 508. pdf]" type="journal article" year="1996">Jennings &amp; Newman (1996)</bibRefCitation>
raised subgenus 
<taxonomicName id="8C8AC885764CC32ACD96FE9EFE56FE0D" box="[417,509,367,392]" class="Rhabditophora" family="Stylochidae" genus="Imogine" higherTaxonomySource="GBIF" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32ACD96FE9EFE56FE0D" box="[417,509,367,392]" italics="true" pageId="8" pageNumber="309">Imogine</emphasis>
</taxonomicName>
to the genus level. Based on this separation, the new species was placed within the genus 
<taxonomicName id="8C8AC885764CC32ACCD7FE62FEE0FE28" authorityName="Ehrenberg" authorityYear="1831" box="[224,331,403,429]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32ACCD7FE62FEE0FE28" box="[224,331,403,429]" italics="true" pageId="8" pageNumber="309">Stylochus</emphasis>
</taxonomicName>
.
</paragraph>
<paragraph id="4B35B306764CC32ACCF0FE46FD3CFDE4" blockId="8.[151,1437,151,1437]" pageId="8" pageNumber="309">
In this way, the genus 
<taxonomicName id="8C8AC885764CC32ACDE6FE46FD97FE54" authorityName="Ehrenberg" authorityYear="1831" box="[465,572,439,465]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32ACDE6FE46FD97FE54" box="[465,572,439,465]" italics="true" pageId="8" pageNumber="309">Stylochus</emphasis>
</taxonomicName>
is represented by 34 species (
<bibRefCitation id="2F1BCEF7764CC32ACFAAFE46FBCFFE57" author="Tyler, S &amp; Schilling, S. &amp; Hooge, M. &amp; Bush, L." box="[925,1124,439,466]" pageId="8" pageNumber="309" refId="ref12405" refString="Tyler, S, Schilling, S., Hooge, M. &amp; Bush, L. F (Comp.) (2006 - 2020) Turbellarian taxonomic database. Version 1.7. Availabel from: http: // turbellaria. umaine. edu (accessed 12 March 2021)" type="url" year="2006">
Tyler 
<emphasis id="79FE6F14764CC32ACFD3FE46FBB4FE54" box="[996,1055,439,465]" italics="true" pageId="8" pageNumber="309">et al.</emphasis>
2006
</bibRefCitation>
-2020), of which four were described from the Eastern Pacific: 
<taxonomicName id="8C8AC885764CC32ACE07FE2AFC4AFE70" authority="Hyman, 1953" authorityName="Hyman" authorityYear="1953" box="[560,993,474,501]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="atentaculatus">
<emphasis id="79FE6F14764CC32ACE07FE2AFC90FE70" box="[560,827,475,501]" italics="true" pageId="8" pageNumber="309">Stylochus atentaculatus</emphasis>
Hyman, 1953
</taxonomicName>
, from San Mateo Beach, California; 
<taxonomicName id="8C8AC885764CC32AC9B0FE2AFE14FD9C" authority="Hyman, 1953" authorityName="Hyman" authorityYear="1953" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="californicus">
<emphasis id="79FE6F14764CC32AC9B0FE2AFEB6FD9C" italics="true" pageId="8" pageNumber="309">S. californicus</emphasis>
Hyman, 1953
</taxonomicName>
, from California; 
<taxonomicName id="8C8AC885764CC32ACEBEFE0EFC7DFD9C" authority="Hyman, 1953" authorityName="Hyman" authorityYear="1953" box="[649,982,510,537]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="franciscanus">
<emphasis id="79FE6F14764CC32ACEBEFE0EFC9FFD9C" box="[649,820,511,537]" italics="true" pageId="8" pageNumber="309">S. franciscanus</emphasis>
Hyman, 1953
</taxonomicName>
, from San Francisco Bay, California and 
<taxonomicName id="8C8AC885764CC32ACCA0FDD2FE1CFDB8" authority="Hyman, 1953" authorityName="Hyman" authorityYear="1953" box="[151,439,546,573]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="insolitus">
<emphasis id="79FE6F14764CC32ACCA0FDD2FEB8FDB8" box="[151,275,547,573]" italics="true" pageId="8" pageNumber="309">S. insolitus</emphasis>
Hyman, 1953
</taxonomicName>
, from 
<collectingCountry id="339DF396764CC32ACE36FDD2FDDFFDB8" box="[513,628,547,573]" name="Saint Pierre and Miquelon" pageId="8" pageNumber="309">San Pedro</collectingCountry>
Breakwater, California. Prior to this study, the genus 
<taxonomicName id="8C8AC885764CC32AC8E2FDD2FAEBFDB8" authorityName="Ehrenberg" authorityYear="1831" box="[1237,1344,547,573]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32AC8E2FDD2FAEBFDB8" box="[1237,1344,547,573]" italics="true" pageId="8" pageNumber="309">Stylochus</emphasis>
</taxonomicName>
had not been recorded in the Tropical Eastern Pacific.
</paragraph>
<paragraph id="4B35B306764CC32ACCF0FD9AFCE2FCBF" blockId="8.[151,1437,151,1437]" pageId="8" pageNumber="309">
Seven of the species described in this genus are associated with barnacles: 
<taxonomicName id="8C8AC885764CC32AC82FFD9AFF79FD2C" authority="Steinbock, 1937" authorityName="Steinbock" authorityYear="1937" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="alexandrinus">
<emphasis id="79FE6F14764CC32AC82FFD9AFAB6FD00" box="[1048,1309,619,645]" italics="true" pageId="8" pageNumber="309">Stylochus alexandrinus</emphasis>
<bibRefCitation id="2F1BCEF7764CC32AC912FD9AFF79FD2C" author="Steinbock, O." pageId="8" pageNumber="309" pagination="1 - 15" refId="ref12272" refString="Steinbock, O. (1937) The Fishery Grounds near Alexandria. 14 - Turbellaria - Ministry of Commerce and Industry, Egypt. Hydrobiology and Fisheries directorate, Notes and memoirs, 25, 1 - 15." type="journal article" year="1937">Steinböck, 1937</bibRefCitation>
</taxonomicName>
, from 
<collectingRegion id="894E7DE4764CC32ACD2AFD7EFE37FD2C" box="[285,412,655,681]" country="Egypt" name="Al Iskandariyah" pageId="8" pageNumber="309">Alexandria</collectingRegion>
, 
<collectingCountry id="339DF396764CC32ACD9DFD7EFE46FD2C" box="[426,493,655,681]" name="Egypt" pageId="8" pageNumber="309">Egypt</collectingCountry>
(
<bibRefCitation id="2F1BCEF7764CC32ACDC9FD7EFD3CFD2F" author="Galleni, L." box="[510,663,655,682]" pageId="8" pageNumber="309" pagination="15 - 25" refId="ref8980" refString="Galleni, L. (1976) Polyclads of the Tuscan Coasts. II. Stylochus alexandrinus Steinbock and Stylochus mediterraneus n. sp. from the rocky shores near Pisa and Livorno. Italian Journal of Zoology, 43, 15 - 25. https: // doi. org / 10.1080 / 11250007609434882" type="journal article" year="1976">Galleni 1976</bibRefCitation>
); 
<taxonomicName id="8C8AC885764CC32ACE9AFD7EFC49FD2C" authority="(Girard, 1850)" baseAuthorityName="Girard" baseAuthorityYear="1850" box="[685,994,654,681]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="ellipticus">
<emphasis id="79FE6F14764CC32ACE9AFD7EFC98FD2C" box="[685,819,655,681]" italics="true" pageId="8" pageNumber="309">S. ellipticus</emphasis>
(
<bibRefCitation id="2F1BCEF7764CC32ACF74FD7EFC71FD2C" author="Girard, C. F." box="[835,986,654,681]" pageId="8" pageNumber="309" pagination="251 - 256" refId="ref9114" refString="Girard, C. F. (1850) Descriptions of several new species of marine planariae from the coast of Massachusetts. Proceedings of the Boston Society of Natural History, 1848 - 1851, 3, 251 - 256." type="journal article" year="1850">Girard, 1850</bibRefCitation>
)
</taxonomicName>
, from south of Massachusetts (
<bibRefCitation id="2F1BCEF7764CC32AC97FFD7EFF78FD48" author="Hyman, L. H." pageId="8" pageNumber="309" pagination="449 - 495" refId="ref9835" refString="Hyman, L. H. (1940) The polyclad flatworms of the Atlantic coast of the United States and Canada. Proceedings of the United States National Museum, 89 (3101), 449 - 495. [https: // repository. si. edu / bitstream / handle / 10088 / 16366 / USNMP- 89 _ 3101 _ 1941. pdf? sequence = 1 &amp; isAllowed = y] https: // doi. org / 10.5479 / si. 00963801.89 - 3101.449" type="journal article" year="1940">Hyman 1940</bibRefCitation>
); 
<taxonomicName id="8C8AC885764CC32ACCDDFD42FE31FD48" baseAuthorityName="Delle Chiaje, 1841-" baseAuthorityYear="1844" box="[234,410,691,717]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="neapolitanus">
<emphasis id="79FE6F14764CC32ACCDDFD42FE31FD48" box="[234,410,691,717]" italics="true" pageId="8" pageNumber="309">S. neapolitanus</emphasis>
</taxonomicName>
(
<bibRefCitation id="2F1BCEF7764CC32ACD9BFD42FD2CFD48" author="Delle Chiaje, S." box="[428,647,691,717]" pageId="8" pageNumber="309" refId="ref8604" refString="Delle Chiaje, S. (1841) Descrizione e notomia degli animali invertebrati della Sicilia citeriore osservati vivi negli anni 1822 - 1830. Stabilimento tipografico di C. Batteli &amp; Comp., Naples, 145 pp. https: // doi. org / 10.5962 / bhl. title. 10031" type="book" year="1841">Delle Chiaje, 1841</bibRefCitation>
-1844), from Sicilia (Barnes 2002); 
<taxonomicName id="8C8AC885764CC32AC81FFD42FAFCFD48" authority="(Goette, 1881)" baseAuthorityName="Goette" baseAuthorityYear="1881" box="[1064,1367,691,717]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="pilidium">
<emphasis id="79FE6F14764CC32AC81FFD42FB0FFD48" box="[1064,1188,691,717]" italics="true" pageId="8" pageNumber="309">S. pilidium</emphasis>
(
<bibRefCitation id="2F1BCEF7764CC32AC881FD42FAE5FD48" author="Goette, A." box="[1206,1358,691,717]" pageId="8" pageNumber="309" pagination="189 - 191" refId="ref9199" refString="Goette, A. (1881) Zur Entwicklungsgeschichte der Wurmer. Zoologischer Anzeiger, 4, 189 - 191." type="journal article" year="1881">Goette, 1881</bibRefCitation>
)
</taxonomicName>
, from Sevastopol Bay, Black Sea (
<bibRefCitation id="2F1BCEF7764CC32ACDF8FD26FD14FD74" author="Rzhepishevskii, J. K." box="[463,703,727,753]" pageId="8" pageNumber="309" pagination="23 - 28" refId="ref12123" refString="Rzhepishevskii, J. K. (1979). Acorn barnacles eating away by Stylochus pilidium. Biologiya Morya, 48, 23 - 28." type="journal article" year="1979">Rzhepishevskii 1979</bibRefCitation>
); 
<taxonomicName id="8C8AC885764CC32ACEE5FD26FB22FD74" authority="Merory &amp; Newman, 2005" authorityName="Merory &amp; Newman" authorityYear="2005" box="[722,1161,726,753]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="pygmaeus">
<emphasis id="79FE6F14764CC32ACEE5FD26FCF5FD75" box="[722,862,727,753]" italics="true" pageId="8" pageNumber="309">S. pygmaeus</emphasis>
<bibRefCitation id="2F1BCEF7764CC32ACF53FD26FB22FD74" author="Merory, M. &amp; Newman, L. J." box="[868,1161,726,753]" pageId="8" pageNumber="309" pagination="2581 - 2589" refId="ref10650" refString="Merory, M. &amp; Newman, L. J. (2005) A new stylochid flatworm (Platyhelminthes, Polycladida) from Victoria, Australia and observations on its biology. Journal of Natural History, 39, 28, 2581 - 2589. https: // doi. org / 10.1080 / 00222930500082045" type="journal article" year="2005">Merory &amp; Newman, 2005</bibRefCitation>
</taxonomicName>
, from 
<collectingRegion id="894E7DE4764CC32AC8E7FD26FA86FD74" box="[1232,1325,727,753]" country="Australia" name="Victoria" pageId="8" pageNumber="309">Victoria</collectingRegion>
, 
<collectingCountry id="339DF396764CC32AC902FD26FA37FD74" box="[1333,1436,727,753]" name="Australia" pageId="8" pageNumber="309">Australia</collectingCountry>
(
<bibRefCitation id="2F1BCEF7764CC32ACCA8FD0AFE17FC90" author="Merory, M. &amp; Newman, L. J." box="[159,444,762,789]" pageId="8" pageNumber="309" pagination="2581 - 2589" refId="ref10650" refString="Merory, M. &amp; Newman, L. J. (2005) A new stylochid flatworm (Platyhelminthes, Polycladida) from Victoria, Australia and observations on its biology. Journal of Natural History, 39, 28, 2581 - 2589. https: // doi. org / 10.1080 / 00222930500082045" type="journal article" year="2005">Merory &amp; Newman 2005</bibRefCitation>
); 
<taxonomicName id="8C8AC885764CC32ACDFAFD0AFD56FC90" authority="Jacubowa, 1909" authorityName="Jacubowa" authorityYear="1909" box="[461,765,763,789]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="tauricus">
<emphasis id="79FE6F14764CC32ACDFAFD0AFDE8FC91" box="[461,579,763,789]" italics="true" pageId="8" pageNumber="309">S. tauricus</emphasis>
<bibRefCitation id="2F1BCEF7764CC32ACE7FFD0AFD56FC90" author="Jacubowa, L." box="[584,765,763,789]" pageId="8" pageNumber="309" pagination="1 - 32" refId="ref10007" refString="Jacubowa, L. (1909). [Die Polycladida der Bucht von Sevastopol.] [In Russian]. Memoires presentes a l'Academie imperiales des sciences de St. Petersbourg, 8, 24, 1 - 32." type="journal article" year="1909">Jacubowa, 1909</bibRefCitation>
</taxonomicName>
, from the Black Sea (
<bibRefCitation id="2F1BCEF7764CC32ACFD2FD0AFB1EFC90" author="Murina, G. &amp; Grintson, V. &amp; Solonchenko, A." box="[997,1205,762,789]" pageId="8" pageNumber="309" pagination="101 - 104" refId="ref10754" refString="Murina, G., Grintson, V. &amp; Solonchenko, A. (1995) Stylochus tauricus, a predator of the barnacle Balanus improvisus in the Black Sea. Hydrobiologia, 305, 101 - 104. [https: // link. springer. com / content / pdf / 10.1007 % 2 FBF 00036369. pdf] https: // doi. org / 10.1007 / BF 00036369" type="journal article" year="1995">
Murina 
<emphasis id="79FE6F14764CC32AC809FD0AFBDEFC90" box="[1086,1141,763,789]" italics="true" pageId="8" pageNumber="309">et al.</emphasis>
1995
</bibRefCitation>
), and 
<taxonomicName id="8C8AC885764CC32AC8C2FD0AFE91FCBC" authority="Laidlaw, 1903" authorityName="Laidlaw" authorityYear="1903" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="zanzibaricus">
<emphasis id="79FE6F14764CC32AC8C2FD0AFAA8FC90" box="[1269,1283,763,789]" italics="true" pageId="8" pageNumber="309">S</emphasis>
. 
<emphasis id="79FE6F14764CC32AC938FD0AFA36FC90" box="[1295,1437,763,789]" italics="true" pageId="8" pageNumber="309">zanzibaricus</emphasis>
<bibRefCitation id="2F1BCEF7764CC32ACCA0FCEEFE91FCBC" author="Laidlaw, F. F." box="[151,314,799,825]" pageId="8" pageNumber="309" pagination="99 - 113" refId="ref10189" refString="Laidlaw, F. F. (1903) On the marine fauna of Zanzibar and British East Africa, from collections made by Cyril Crossland in the Years 1901 and 1902. Turbellaria Polycladida. I. The Acotylea. Proceedings of the Zoological Society, 2 (8), 99 - 113." type="journal article" year="1903">Laidlaw, 1903</bibRefCitation>
</taxonomicName>
, from 
<collectingCountry id="339DF396764CC32ACDB4FCEEFD9FFCBC" box="[387,564,799,825]" name="Zanzibar Island" pageId="8" pageNumber="309">Zanzibar Island</collectingCountry>
, Africa (
<bibRefCitation id="2F1BCEF7764CC32ACEA3FCEEFC97FCBF" author="Skerman, T. M." box="[660,828,799,826]" pageId="8" pageNumber="309" pagination="610 - 614" refId="ref12150" refString="Skerman, T. M. (1960) Note on Stylochus zanzibaricus Laidlaw (Turbellaria, Polycladida), a suspected predator of barnacles in the Port of Auckland, New Zealand. New Zealand, Journal of Science, 3, 610 - 614." type="journal article" year="1960">Skerman 1960</bibRefCitation>
).
</paragraph>
<paragraph id="4B35B306764CC32ACCF0FCB2FA8FFC04" blockId="8.[151,1437,151,1437]" pageId="8" pageNumber="309">
The comparison of 
<taxonomicName id="8C8AC885764CC32ACD9AFCB2FDC1FCD9" authority="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala, 2021" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[429,618,835,861]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="mistus" status="sp. nov.">
<emphasis id="79FE6F14764CC32ACD9AFCB2FDC1FCD9" box="[429,618,835,861]" italics="true" pageId="8" pageNumber="309">Stylochus mistus</emphasis>
</taxonomicName>
<emphasis id="79FE6F14764CC32ACE42FCB2FD79FCD8" bold="true" box="[629,722,835,861]" pageId="8" pageNumber="309">
<taxonomicNameLabel id="62CDD26F764CC32ACE42FCB2FD79FCD8" box="[629,722,835,861]" pageId="8" pageNumber="309" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
was made taking into consideration the external and internal characters of the four species from 
<collectingRegion id="894E7DE4764CC32ACE15FC96FD3FFC04" box="[546,660,871,897]" country="United States of America" name="California" pageId="8" pageNumber="309">California</collectingRegion>
as well as the seven species associated with the barnacles.
</paragraph>
<paragraph id="4B35B306764CC32ACCF0FC7AFF4BFBB0" blockId="8.[151,1437,151,1437]" pageId="8" pageNumber="309">
<taxonomicName id="8C8AC885764CC32ACCF0FC7AFE29FC21" authority="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala, 2021" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[199,386,907,933]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="mistus" status="sp. nov.">
<emphasis id="79FE6F14764CC32ACCF0FC7AFE29FC21" box="[199,386,907,933]" italics="true" pageId="8" pageNumber="309">Stylochus mistus</emphasis>
</taxonomicName>
<emphasis id="79FE6F14764CC32ACDBEFC7AFE48FC20" bold="true" box="[393,483,907,933]" pageId="8" pageNumber="309">
<taxonomicNameLabel id="62CDD26F764CC32ACDBEFC7AFE48FC20" box="[393,483,907,933]" pageId="8" pageNumber="309" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
has frontal eyes and marginal eyes distributed in the first third of the body; it differs from 
<taxonomicName id="8C8AC885764CC32ACCE0FC5EFE2DFC4C" baseAuthorityName="Delle Chiaje, 1841-" baseAuthorityYear="1844" box="[215,390,943,969]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="neapolitanus">
<emphasis id="79FE6F14764CC32ACCE0FC5EFE2DFC4C" box="[215,390,943,969]" italics="true" pageId="8" pageNumber="309">S. neapolitanus</emphasis>
</taxonomicName>
, 
<taxonomicName id="8C8AC885764CC32ACDA1FC5EFD8FFC4D" authorityName="Merory &amp; Newman" authorityYear="2005" box="[406,548,943,969]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="pygmaeus">
<emphasis id="79FE6F14764CC32ACDA1FC5EFD8FFC4D" box="[406,548,943,969]" italics="true" pageId="8" pageNumber="309">S. pygmaeus</emphasis>
</taxonomicName>
and 
<taxonomicName id="8C8AC885764CC32ACE68FC5EFCA7FC4C" authorityName="Laidlaw" authorityYear="1903" box="[607,780,943,969]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="zanzibaricus">
<emphasis id="79FE6F14764CC32ACE68FC5EFDC6FC4C" box="[607,621,943,969]" italics="true" pageId="8" pageNumber="309">S</emphasis>
. 
<emphasis id="79FE6F14764CC32ACE49FC5EFCA7FC4C" box="[638,780,943,969]" italics="true" pageId="8" pageNumber="309">zanzibaricus</emphasis>
</taxonomicName>
in that those lack frontal eyes (
<bibRefCitation id="2F1BCEF7764CC32AC84EFC5EFAB0FC4C" author="Laidlaw, F. F." box="[1145,1307,943,969]" pageId="8" pageNumber="309" pagination="99 - 113" refId="ref10189" refString="Laidlaw, F. F. (1903) On the marine fauna of Zanzibar and British East Africa, from collections made by Cyril Crossland in the Years 1901 and 1902. Turbellaria Polycladida. I. The Acotylea. Proceedings of the Zoological Society, 2 (8), 99 - 113." type="journal article" year="1903">Laidlaw 1903</bibRefCitation>
; 
<bibRefCitation id="2F1BCEF7764CC32AC91EFC5EFE94FC68" author="Merory, M. &amp; Newman, L. J." pageId="8" pageNumber="309" pagination="2581 - 2589" refId="ref10650" refString="Merory, M. &amp; Newman, L. J. (2005) A new stylochid flatworm (Platyhelminthes, Polycladida) from Victoria, Australia and observations on its biology. Journal of Natural History, 39, 28, 2581 - 2589. https: // doi. org / 10.1080 / 00222930500082045" type="journal article" year="2005">Merory &amp; Newman 2005</bibRefCitation>
; 
<bibRefCitation id="2F1BCEF7764CC32ACD7BFC22FD95FC68" author="Marquina, D. &amp; Osca, D. &amp; Rodriguez, J. &amp; Fernandez-Despiau, E. &amp; Norena, C." box="[332,574,979,1005]" pageId="8" pageNumber="309" pagination="108 - 134" refId="ref10521" refString="Marquina, D., Osca, D., Rodriguez, J., Fernandez-Despiau, E. &amp; Norena, C. (2014) State of knowledge of the Acotylea (Polycladida, Platyhelminthes) from the Mediterranean coasts of Spain: new records and new species. Zootaxa, 3780 (1), 108 - 134. https: // doi. org / 10.11646 / zootaxa. 3780.1.4" type="journal article" year="2014">
Marquina 
<emphasis id="79FE6F14764CC32ACDF6FC22FE51FC68" box="[449,506,979,1005]" italics="true" pageId="8" pageNumber="309">et al.</emphasis>
2014
</bibRefCitation>
; 
<bibRefCitation id="2F1BCEF7764CC32ACE7DFC22FC8AFC68" author="Norena, C. &amp; Rodriguez, J. &amp; Perez, J. &amp; Almon, B." box="[586,801,978,1005]" pageId="8" pageNumber="309" pagination="157 - 172" refId="ref11258" refString="Norena, C., Rodriguez, J., Perez, J. &amp; Almon, B. (2015) New Acotylea (Polycladida, Platyhelminthes) from the east coast of the North Atlantic Ocean with special mention of the Iberian littoral. Zootaxa, 4039 (1), 157 - 172. https: // doi. org / 10.11646 / zootaxa. 4039.1.7" type="journal article" year="2015">
Noreña 
<emphasis id="79FE6F14764CC32ACE93FC22FD75FC68" box="[676,734,979,1005]" italics="true" pageId="8" pageNumber="309">et al.</emphasis>
2015
</bibRefCitation>
), and from 
<emphasis id="79FE6F14764CC32ACF92FC22FAA0FC68" box="[933,1291,979,1005]" italics="true" pageId="8" pageNumber="309">
<taxonomicName id="8C8AC885764CC32ACF92FC22FBF7FC68" authorityName="Hyman" authorityYear="1953" box="[933,1116,979,1005]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="atentaculatus">S. atentaculatus</taxonomicName>
, 
<taxonomicName id="8C8AC885764CC32AC850FC22FAA0FC68" authorityName="Hyman" authorityYear="1953" box="[1127,1291,979,1005]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="californicus">S. californicus</taxonomicName>
</emphasis>
, 
<taxonomicName id="8C8AC885764CC32AC92EFC22FA3EFC68" authorityName="Hyman" authorityYear="1953" box="[1305,1429,979,1005]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="insolitus">
<emphasis id="79FE6F14764CC32AC92EFC22FA3EFC68" box="[1305,1429,979,1005]" italics="true" pageId="8" pageNumber="309">S. insolitus</emphasis>
</taxonomicName>
, and 
<taxonomicName id="8C8AC885764CC32ACCF0FC06FE95FB95" authorityName="Jacubowa" authorityYear="1909" box="[199,318,1015,1041]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="tauricus">
<emphasis id="79FE6F14764CC32ACCF0FC06FE95FB95" box="[199,318,1015,1041]" italics="true" pageId="8" pageNumber="309">S. tauricus</emphasis>
</taxonomicName>
because the marginal eyes are distributed over the entire body margin (
<bibRefCitation id="2F1BCEF7764CC32AC86AFC06FAABFB94" author="Hyman, L. H." box="[1117,1280,1014,1041]" pageId="8" pageNumber="309" pagination="265 - 392" refId="ref9924" refString="Hyman, L. H. (1953 a) The polyclad flatworms of the Pacific coast of North America. Bulletin of the American Museum of Natural History, 100 (2), 265 - 392. http: // hdl. handle. net / 2246 / 1028" type="journal article" year="1953">Hyman 1953a</bibRefCitation>
; 
<bibRefCitation id="2F1BCEF7764CC32AC93CFC06FF78FBB0" author="Murina, G. &amp; Grintson, V. &amp; Solonchenko, A." pageId="8" pageNumber="309" pagination="101 - 104" refId="ref10754" refString="Murina, G., Grintson, V. &amp; Solonchenko, A. (1995) Stylochus tauricus, a predator of the barnacle Balanus improvisus in the Black Sea. Hydrobiologia, 305, 101 - 104. [https: // link. springer. com / content / pdf / 10.1007 % 2 FBF 00036369. pdf] https: // doi. org / 10.1007 / BF 00036369" type="journal article" year="1995">
Murina 
<emphasis id="79FE6F14764CC32AC953FC06FA36FB94" box="[1380,1437,1015,1041]" italics="true" pageId="8" pageNumber="309">et al.</emphasis>
1995
</bibRefCitation>
).
</paragraph>
<paragraph id="4B35B306764CC32ACCF0FBCEFB83FB24" blockId="8.[151,1437,151,1437]" pageId="8" pageNumber="309">
<taxonomicName id="8C8AC885764CC32ACCF0FBCEFE2BFBDD" authority="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala, 2021" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[199,384,1087,1113]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="mistus" status="sp. nov.">
<emphasis id="79FE6F14764CC32ACCF0FBCEFE2BFBDD" box="[199,384,1087,1113]" italics="true" pageId="8" pageNumber="309">Stylochus mistus</emphasis>
</taxonomicName>
<emphasis id="79FE6F14764CC32ACDB2FBCEFE77FBDC" bold="true" box="[389,476,1087,1113]" pageId="8" pageNumber="309">
<taxonomicNameLabel id="62CDD26F764CC32ACDB2FBCEFE77FBDC" box="[389,476,1087,1113]" pageId="8" pageNumber="309" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
has separate gonopores and an unarmed penis papilla, and differs from 
<taxonomicName id="8C8AC885764CC32AC8DBFBCEFA3EFBDC" authorityName="Hyman" authorityYear="1953" box="[1260,1429,1087,1113]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="franciscanus">
<emphasis id="79FE6F14764CC32AC8DBFBCEFA3EFBDC" box="[1260,1429,1087,1113]" italics="true" pageId="8" pageNumber="309">S. franciscanus</emphasis>
</taxonomicName>
, 
<taxonomicName id="8C8AC885764CC32ACCA0FB92FEE3FBF8" authorityName="Steinbock" authorityYear="1937" box="[151,328,1123,1149]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="alexandrinus">
<emphasis id="79FE6F14764CC32ACCA0FB92FEE3FBF8" box="[151,328,1123,1149]" italics="true" pageId="8" pageNumber="309">S. alexandrinus</emphasis>
</taxonomicName>
, species which have a common gonopore (
<bibRefCitation id="2F1BCEF7764CC32ACF08FB92FC4EFBF8" author="Hyman, L. H." box="[831,997,1122,1149]" pageId="8" pageNumber="309" pagination="265 - 392" refId="ref9924" refString="Hyman, L. H. (1953 a) The polyclad flatworms of the Pacific coast of North America. Bulletin of the American Museum of Natural History, 100 (2), 265 - 392. http: // hdl. handle. net / 2246 / 1028" type="journal article" year="1953">Hyman 1953a</bibRefCitation>
; 
<bibRefCitation id="2F1BCEF7764CC32ACFC3FB92FB27FBFB" author="Galleni, L." box="[1012,1164,1123,1150]" pageId="8" pageNumber="309" pagination="15 - 25" refId="ref8980" refString="Galleni, L. (1976) Polyclads of the Tuscan Coasts. II. Stylochus alexandrinus Steinbock and Stylochus mediterraneus n. sp. from the rocky shores near Pisa and Livorno. Italian Journal of Zoology, 43, 15 - 25. https: // doi. org / 10.1080 / 11250007609434882" type="journal article" year="1976">Galleni 1976</bibRefCitation>
); and from 
<taxonomicName id="8C8AC885764CC32AC920FB92FA36FBF8" baseAuthorityName="Girard" baseAuthorityYear="1850" box="[1303,1437,1123,1149]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="ellipticus">
<emphasis id="79FE6F14764CC32AC920FB92FA36FBF8" box="[1303,1437,1123,1149]" italics="true" pageId="8" pageNumber="309">S. ellipticus</emphasis>
</taxonomicName>
(
<bibRefCitation id="2F1BCEF7764CC32ACCA8FB76FEE9FB24" author="Hyman, L. H." box="[159,322,1159,1185]" pageId="8" pageNumber="309" pagination="127 - 152" refId="ref9679" refString="Hyman, L. H. (1939 a) Some polyclads of the New England coast, especially of the Woods Hole region. Biological Bulletin, 76 (2), 127 - 152. [https: // www. journals. uchicago. edu / doi / pdfplus / 10.2307 / 1537854] https: // doi. org / 10.2307 / 1537854" type="journal article" year="1939">Hyman 1939a</bibRefCitation>
; 
<bibRefCitation id="2F1BCEF7764CC32ACD7AFB76FE4BFB24" author="Hyman, L. H." box="[333,480,1159,1185]" pageId="8" pageNumber="309" pagination="449 - 495" refId="ref9835" refString="Hyman, L. H. (1940) The polyclad flatworms of the Atlantic coast of the United States and Canada. Proceedings of the United States National Museum, 89 (3101), 449 - 495. [https: // repository. si. edu / bitstream / handle / 10088 / 16366 / USNMP- 89 _ 3101 _ 1941. pdf? sequence = 1 &amp; isAllowed = y] https: // doi. org / 10.5479 / si. 00963801.89 - 3101.449" type="journal article" year="1940">Hyman 1940</bibRefCitation>
) because this species has a penis papilla with stylet.
</paragraph>
<paragraph id="4B35B306764CC32ACCF0FB5AFC25FA18" blockId="8.[151,1437,151,1437]" pageId="8" pageNumber="309">
The species of the genus 
<taxonomicName id="8C8AC885764CC32ACDD7FB5AFDE0FB40" authorityName="Ehrenberg" authorityYear="1831" box="[480,587,1195,1221]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="genus">
<emphasis id="79FE6F14764CC32ACDD7FB5AFDE0FB40" box="[480,587,1195,1221]" italics="true" pageId="8" pageNumber="309">Stylochus</emphasis>
</taxonomicName>
can be differentiated based on the color and pattern of coloration, presence/ absence of frontal eyes, the distribution of marginal eyes, the morphology of the hermaphroditic reproductive system, the presence/absence of armament of the penis papilla and the shape of the vagina (
<tableCitation id="060886BD764CC32AC8B8FB02FB74FA88" box="[1167,1247,1267,1293]" captionStart="TABLE I" captionStartId="9.[151,239,605,631]" captionTargetBox="[168,2018,646,1605]" captionText="TABLE I. Comparison of the characters of Stylochus mistus sp. nov. with other species of the genus recorded from the Eastern Pacific" httpUri="http://table.plazi.org/id/1FF5E38E764DC32BCCA0FDACF991FDF2" pageId="8" pageNumber="309" tableUuid="1FF5E38E764DC32BCCA0FDACF991FDF2">Table I</tableCitation>
) (
<bibRefCitation id="2F1BCEF7764CC32AC8C2FB02FA33FA88" author="Hyman, L. H." box="[1269,1432,1267,1293]" pageId="8" pageNumber="309" pagination="127 - 152" refId="ref9679" refString="Hyman, L. H. (1939 a) Some polyclads of the New England coast, especially of the Woods Hole region. Biological Bulletin, 76 (2), 127 - 152. [https: // www. journals. uchicago. edu / doi / pdfplus / 10.2307 / 1537854] https: // doi. org / 10.2307 / 1537854" type="journal article" year="1939">Hyman 1939a</bibRefCitation>
; 
<bibRefCitation id="2F1BCEF7764CC32ACCA0FAE6FF79FAB4" author="Hyman, L. H." box="[151,210,1303,1329]" pageId="8" pageNumber="309" pagination="449 - 495" refId="ref9835" refString="Hyman, L. H. (1940) The polyclad flatworms of the Atlantic coast of the United States and Canada. Proceedings of the United States National Museum, 89 (3101), 449 - 495. [https: // repository. si. edu / bitstream / handle / 10088 / 16366 / USNMP- 89 _ 3101 _ 1941. pdf? sequence = 1 &amp; isAllowed = y] https: // doi. org / 10.5479 / si. 00963801.89 - 3101.449" type="journal article" year="1940">1940</bibRefCitation>
; 
<bibRefCitation id="2F1BCEF7764CC32ACCD7FAE7FE82FAB4" author="Hyman, L. H." box="[224,297,1302,1329]" pageId="8" pageNumber="309" pagination="265 - 392" refId="ref9924" refString="Hyman, L. H. (1953 a) The polyclad flatworms of the Pacific coast of North America. Bulletin of the American Museum of Natural History, 100 (2), 265 - 392. http: // hdl. handle. net / 2246 / 1028" type="journal article" year="1953">1953a</bibRefCitation>
). Other taxonomic characters for the specific definition, suggested by the present study, are: 1) the internal arrangement of the prostatic vesicle, which may be of the polyglandular or monoglandular 
<typeStatus id="94310DA4764CC32AC8C2FACAFA8EFAD0" box="[1269,1317,1339,1365]" pageId="8" pageNumber="309">type</typeStatus>
(reviewed in 
<bibRefCitation id="2F1BCEF7764CC32ACC84FAAEFE2AFAFC" author="Bulnes, V. N. &amp; Faubel, A." box="[179,385,1374,1401]" pageId="8" pageNumber="309" pagination="2089 - 2107" refId="ref8402" refString="Bulnes, V. N., Faubel, A. &amp; Park. J. K. (2005) Two new marine species from South Korea with remarks on the family Stylochidae (Acotylea, Polycladida, Plathelminthes). Journal of Natural History, 39 (23), 2089 - 2107. https: // doi. org / 10.1080 / 00222930500081997" type="journal article" year="2005">
Bulnes 
<emphasis id="79FE6F14764CC32ACD30FAAEFE9CFAFC" box="[263,311,1375,1401]" italics="true" pageId="8" pageNumber="309">et al</emphasis>
. 2005
</bibRefCitation>
); 2) presence of a glandular lining of the male atrium, described previously only in 
<taxonomicName id="8C8AC885764CC32AC92DFAAEFA36FAFC" baseAuthorityName="Girard" baseAuthorityYear="1850" box="[1306,1437,1375,1401]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="ellipticus">
<emphasis id="79FE6F14764CC32AC92DFAAEFA36FAFC" box="[1306,1437,1375,1401]" italics="true" pageId="8" pageNumber="309">S. ellipticus</emphasis>
</taxonomicName>
(
<bibRefCitation id="2F1BCEF7764CC32ACCA8FA72FEEAFA18" author="Hyman, L. H." box="[159,321,1411,1437]" pageId="8" pageNumber="309" pagination="127 - 152" refId="ref9679" refString="Hyman, L. H. (1939 a) Some polyclads of the New England coast, especially of the Woods Hole region. Biological Bulletin, 76 (2), 127 - 152. [https: // www. journals. uchicago. edu / doi / pdfplus / 10.2307 / 1537854] https: // doi. org / 10.2307 / 1537854" type="journal article" year="1939">Hyman 1939a</bibRefCitation>
, 
<bibRefCitation id="2F1BCEF7764CC32ACD7BFA72FE23FA18" author="Hyman, L. H." box="[332,392,1411,1437]" pageId="8" pageNumber="309" pagination="449 - 495" refId="ref9835" refString="Hyman, L. H. (1940) The polyclad flatworms of the Atlantic coast of the United States and Canada. Proceedings of the United States National Museum, 89 (3101), 449 - 495. [https: // repository. si. edu / bitstream / handle / 10088 / 16366 / USNMP- 89 _ 3101 _ 1941. pdf? sequence = 1 &amp; isAllowed = y] https: // doi. org / 10.5479 / si. 00963801.89 - 3101.449" type="journal article" year="1940">1940</bibRefCitation>
), and also present in 
<taxonomicName id="8C8AC885764CC32ACE43FA72FC85FA19" authority="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala, 2021" authorityName="Ramos-Sánchez &amp; Carrasco-Rodríguez &amp; García-Madrigal &amp; Bastida-Zavala" authorityYear="2021" box="[628,814,1411,1437]" class="Rhabditophora" family="Stylochidae" genus="Stylochus" kingdom="Animalia" order="Polycladida" pageId="8" pageNumber="309" phylum="Platyhelminthes" rank="species" species="mistus" status="sp. nov.">
<emphasis id="79FE6F14764CC32ACE43FA72FC85FA19" box="[628,814,1411,1437]" italics="true" pageId="8" pageNumber="309">Stylochus mistus</emphasis>
</taxonomicName>
<emphasis id="79FE6F14764CC32ACF02FA72FC25FA18" bold="true" box="[821,910,1411,1437]" pageId="8" pageNumber="309">
<taxonomicNameLabel id="62CDD26F764CC32ACF02FA72FC25FA18" box="[821,910,1411,1437]" pageId="8" pageNumber="309" rank="species">sp. nov.</taxonomicNameLabel>
</emphasis>
</paragraph>
</subSubSection>
</treatment>
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