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<document id="559BABE1CF9FD14912A07460EC2DF826" ID-CLB-Dataset="305028" ID-DOI="10.3897/zse.100.128211" ID-GBIF-Dataset="99e39b62-b202-488d-bb11-afe8eb6beb71" ID-ZooBank="C47F14AC-1C3E-43AC-9645-D5FBC843AA7A" ID-publisher-id="128211" URI-arpha="F2AFB3D6-98DA-58B3-8D89-91D92CA43597" URI-zoobank="http://zoobank.org/C47F14AC-1C3E-43AC-9645-D5FBC843AA7A" XM.bibliography_approvedBy="admin" XM.materialsCitations_approvedBy="admin" XM.taxonomicNames_approvedBy="admin" XM.treatmentCitations_approvedBy="admin" article-type="research-article" checkinTime="1731000561805" checkinUser="pensoft" docAuthor="Pérez-García, Patricia, Gouveia, Filipa, Calado, Gonçalo, Noreña, Carolina &amp; Cervera, Juan Lucas" docDate="2024" docId="20A780117B1F5DA498B1B523A826DA77" docLanguage="en" docName="Zoosystematics and Evolution 100(4): 1487-1513" docOrigin="Zoosystematics and Evolution 100 (4)" docSource="https://zse.pensoft.net/article/128211/download/xml/" docStyle="DocumentStyle:PensoftTaxPub.0000.journal_article.generic" docStyleName="PensoftTaxPub.0000.journal_article.generic" docTitle="Plehnia cascaisensis Pérez-García, Gouveia, Calado, Noreña &amp; Cervera, 2024, sp. nov." docType="treatment" docVersion="4" dtd-version="3.0" lastPageNumber="1513" masterDocId="F2AFB3D698DA58B38D8991D92CA43597" masterDocTitle="Acotylea (Platyhelminthes, Polycladida) from the southern and western Iberian Peninsula, with the description of five new species" masterLastPageNumber="1513" masterPageNumber="1487" pageNumber="1487" updateTime="1731006017661" updateUser="ExternalLinkService">
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<mods:title id="CC6F193B5703F154775CA02C5F703266">Acotylea (Platyhelminthes, Polycladida) from the southern and western Iberian Peninsula, with the description of five new species</mods:title>
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<mods:namePart id="2023DAEB380006803E4F0D6B040C7E40">Pérez-García, Patricia</mods:namePart>
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<mods:affiliation id="88272C2D9744C1D16FF76E9221BB96F1">Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Campus de Excelencia Internacional del Mar (CEI MAR), Av. República Saharahui, s / n, Ap. 40. 11510, Puerto Real (Cádiz), Spain</mods:affiliation>
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<mods:namePart id="511CE1DE6AA7A38ED4181C00F75FA977">Gouveia, Filipa</mods:namePart>
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<taxonomicName id="6B197A5915209C1DE8B9A6251783428E" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="7FA455959C8FB76C000A0A7E51E25D0B" italics="true">Plehnia cascaisensis</emphasis>
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<taxonomicNameLabel id="A1E44F9C592D6D8C7607586F4BA4246D" rank="species">sp. nov.</taxonomicNameLabel>
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<paragraph id="5567E4A3560B1ED9A42B755511E97C5B">
<figureCitation id="6795933D91FFCBE1134FC029E3DAC854" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Plehnia cascaisensis sp. nov. Histological sections are postero-anteriorly oriented: A. Dorsal view of a living specimen (holotype, MNHNC MB 16-000107); B. Dorsal view of a living specimen (additional material, MB 16-000108); C. Detail of the eyes (additional material); D. Histological section of the tentacle (holotype); E. Histological section of the male copulatory organs (holotype); F. Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands." figureDoi="10.3897/zse.100.128211.figure6" httpUri="https://binary.pensoft.net/fig/1169819">Figs 6</figureCitation>
,
<figureCitation id="01A8EB4238FB5CA982073FA18A65C93B" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Plehnia cascaisensis sp. nov. (holotype, MNHNC MB 16-000107). Histological sections are postero-anteriorly oriented: A. Histological section of the long internal vagina (holotype); B. Histological section of the end of the internal vagina and Langs vesicle (holotype); C. Sagittal reconstruction of the reproductive system (holotype). Abbreviations: cg, cemental glands; ed, ejaculatory duct; el, epithelial lining; ev, external vagina; fp, female pore; i, intestine; iv, internal vagina; lv, Langs vesicle; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; sb, spermiducal bulbs; spv, spermiducal vesicle." figureDoi="10.3897/zse.100.128211.figure7" httpUri="https://binary.pensoft.net/fig/1169820">7</figureCitation>
</paragraph>
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<paragraph id="609BEB6CB6ECA859AC178BAE87245EB7">
<heading id="16684E173ABE605FE71C21B988CB5F8E" reason="title">
<typeStatus id="44CD01587D191F1BC1AF8F11AD33C269" type="holotype">Holotype</typeStatus>
.
</heading>
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<specimenCode id="AF60A5E8D3AC41758C2817D85C15A9B0" collectionCode="MB" country="Portugal" name="Universidade de Lisboa, Museu Bocage">MB 16-000107</specimenCode>
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,
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,
<date id="35D08640C38BF759F72E2464F01A9C73" value="2015-05-29">
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at
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<quantity id="ADAAAF5D3CC8EC0FDC0103B25C758A17" metricMagnitude="1" metricUnit="m" metricValue="2.8" unit="m" value="28.0">28 m</quantity>
depth
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,
<quantity id="120E4F35221E1AB60A40F145EA1082B4" metricMagnitude="-3" metricUnit="m" metricValue="9.0" unit="mm" value="9.0">9 mm</quantity>
long fixed, sagittal sectioned into 8 slides.
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</paragraph>
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<paragraph id="641E328776F49A6196BFE2D00E08CC63">
<heading id="9E5C962A9008BC9A64CAD711A077B617" reason="title">Additional material.</heading>
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<paragraph id="3623857BDD17AC8874D857F1B9D6009F">
<materialsCitation id="2820D0CBAEFF7E9323ED3BCA5820B711" collectingDate="2015-05-26" collectionCode="MNHNC" elevation="0" location="Station 3" specimenCode="MB 16-000108" specimenCount="1">
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<specimenCode id="5598DA4575CD021D13E712445D322BE4" collectionCode="MB" country="Portugal" name="Universidade de Lisboa, Museu Bocage">MB 16-000108</specimenCode>
</specimenCode>
,
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,
<date id="7841468F0361195FDD3E740753E06309" value="2015-05-26">
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, at
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<quantity id="CD4F084A257E90D9DC230FEB73DA54B3" metricMagnitude="0" metricUnit="m" metricValue="9.1" unit="m" value="9.1">9.1 m</quantity>
depth
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,
<quantity id="05B32475BA0A0271F1F57824807C1A8F" metricMagnitude="-3" metricUnit="m" metricValue="4.0" unit="mm" value="4.0">4 mm</quantity>
long, fixed, and sagittally sectioned into 3 slides
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. •
<materialsCitation id="B1F5C9D9193205A7F57E75B337B564DB" collectingDate="2015-05-28" collectionCode="MNHNC" elevation="24" location="Station 3" specimenCode="MB 16-000109" specimenCount="1">
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,
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,
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at
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<quantity id="9C534FFB273060C45E119E4FCB9B0D7F" metricMagnitude="1" metricUnit="m" metricValue="2.4" unit="m" value="24.0">24 m</quantity>
depth
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,
<quantity id="FF2078917BED721A5C25157F41D82871" metricMagnitude="-3" metricUnit="m" metricValue="6.0" unit="mm" value="6.0">6 mm</quantity>
long fixed
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. •
<materialsCitation id="906A14646D104D0D1DBDA46621F5C634" collectingDate="2015-05-28" collectionCode="MNHNC" elevation="24" location="Station 3" specimenCode="MB 16-000110" specimenCount="1">
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<specimenCode id="3D93443306BBAA5CA5E4360852754081" collectionCode="MB" country="Portugal" name="Universidade de Lisboa, Museu Bocage">MB 16-000110</specimenCode>
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,
<location id="9E0C1EAB0B5E991A615F596F41C2863A" LSID="urn:lsid:plazi:treatment:20A780117B1F5DA498B1B523A826DA77:9E0C1EAB0B5E991A615F596F41C2863A" name="Station 3">Station 3</location>
,
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at
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<quantity id="6E8502AE7122E8F42BD11E11C83EB3F1" metricMagnitude="1" metricUnit="m" metricValue="2.4" unit="m" value="24.0">24 m</quantity>
depth
</elevation>
,
<quantity id="5EF345B3CE3A4435DE41AB2B49EE6A79" metricMagnitude="-3" metricUnit="m" metricValue="6.0" unit="mm" value="6.0">6 mm</quantity>
long fixed
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.
</paragraph>
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<paragraph id="77FF886FA913D17E143B81E8E9495DFD">
<heading id="3ABB184CFDC821FF5AC0730E9DC4639D" reason="title">Diagnosis.</heading>
</paragraph>
<paragraph id="37EB4D14F9A4BB53E27540065FDA354B">
<taxonomicName id="0C1E7B11042668C4583A36E0820FDC09" authorityName="Bock" authorityYear="1913" family="Plehniidae" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="family">Plehniidae</taxonomicName>
with a yellowish-brown background colour and multiple brown spots scattered on the dorsal surface; pale yellow ventral body; well-separated gonopores; penis papilla characterised by a cap-shaped connective tissue; wide external vagina; and very long internal vagina.
</paragraph>
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<subSubSection id="SECID0EKDAI" type="description">
<paragraph id="AADAFC126CBB31437F796E4401856867">
<heading id="4E4B226024AE0F9A277A5DE00F6620DB" reason="title">Description.</heading>
</paragraph>
<paragraph id="EADC91830850DF502775250FDC87AD96">
<taxonomicName id="3FF0081F456182C226F9295A62597686" authorityName="Bock" authorityYear="1913" family="Plehniidae" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="family">Plehniidae</taxonomicName>
with fleshy and elongated body shape, rounded anteriorly and posteriorly, with high thickness. Length of voucher specimens varies between 4 and
<quantity id="C8AD00AA754C8F97117D378DEB53E8D6" metricMagnitude="-3" metricUnit="m" metricValue="6.0" unit="mm" value="6.0">6 mm</quantity>
fixed (average of 6.25 ±
<quantity id="11FE63822509572B83F92BFDC8F3BC1A" metricMagnitude="-3" metricUnit="m" metricValue="2.06" unit="mm" value="2.06">2.06 mm</quantity>
). Ground colouration yellowish-brown with numerous brown spots scattered across the dorsal surface (see Fig.
<figureCitation id="7BF24444DEC4D0BACA3E77BCAAAB4037" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Plehnia cascaisensis sp. nov. Histological sections are postero-anteriorly oriented: A. Dorsal view of a living specimen (holotype, MNHNC MB 16-000107); B. Dorsal view of a living specimen (additional material, MB 16-000108); C. Detail of the eyes (additional material); D. Histological section of the tentacle (holotype); E. Histological section of the male copulatory organs (holotype); F. Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands." figureDoi="10.3897/zse.100.128211.figure6" httpUri="https://binary.pensoft.net/fig/1169819">6 A, B</figureCitation>
). Ventral side pale yellow. Nuchal tentacles present (Fig.
<figureCitation id="A6FBF4ED0D876500B6DDDAAF44557FCD" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Plehnia cascaisensis sp. nov. Histological sections are postero-anteriorly oriented: A. Dorsal view of a living specimen (holotype, MNHNC MB 16-000107); B. Dorsal view of a living specimen (additional material, MB 16-000108); C. Detail of the eyes (additional material); D. Histological section of the tentacle (holotype); E. Histological section of the male copulatory organs (holotype); F. Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands." figureDoi="10.3897/zse.100.128211.figure6" httpUri="https://binary.pensoft.net/fig/1169819">6 D</figureCitation>
). Tentacular eyes arranged in two clusters, located just under the tentacles. Small cerebral eyes in two clusters, extending from the tentacle to the anterior margin (Fig.
<figureCitation id="8B89126D4F1919F37B486A455F82B436" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Plehnia cascaisensis sp. nov. Histological sections are postero-anteriorly oriented: A. Dorsal view of a living specimen (holotype, MNHNC MB 16-000107); B. Dorsal view of a living specimen (additional material, MB 16-000108); C. Detail of the eyes (additional material); D. Histological section of the tentacle (holotype); E. Histological section of the male copulatory organs (holotype); F. Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands." figureDoi="10.3897/zse.100.128211.figure6" httpUri="https://binary.pensoft.net/fig/1169819">6 C</figureCitation>
). Frontal eyes scattered at the anterior body margin. Ruffled pharynx positioned between the second and third regions. Genital pores separated and posterior to the pharyngeal pocket. Ovaries dorsal to the testes.
</paragraph>
<caption id="D5E50F094D201C6DC86AC12BEF33960E" ID-DOI="10.3897/zse.100.128211.figure6" ID-arpha="FFD0110A-101E-566F-984E-4A85A080DA81" httpUri="https://binary.pensoft.net/fig/1169819" startId="F6">
<paragraph id="6E1163D3592A5FD65652AE50D45F11B7">
<label id="3B121F0D2E9D1BB902888E0A45158F41">Figure 6.</label>
</paragraph>
<paragraph id="2DD82C38AA690885C8F8374647371223">
<taxonomicName id="D7EFD4E63F5C184F8BA09DBC1CF46354" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="39D27134DF863E8C67A7E30C01406040" italics="true">Plehnia cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="6FA0E3D901A04226E97D3F9F1922C445" rank="species">sp. nov.</taxonomicNameLabel>
Histological sections are postero-anteriorly oriented:
<emphasis id="166E7C11573B2372434B326554A5424C" bold="true">A.</emphasis>
Dorsal view of a living specimen (holotype,
<specimenCode id="CE361814A49B6A14A6D81354BAF6294A">
<abbrev id="ABBRID0EWEAI" xlink_title="Museu Nacional de História Natural e da Ciência of Lisbon">MNHNC</abbrev>
MB 16-000107
</specimenCode>
);
<emphasis id="7F00509C052FF0307F435CB5281994C7" bold="true">B.</emphasis>
Dorsal view of a living specimen (additional material, MB 16-000108);
<emphasis id="EF6CE85BD4325CCBB0132DBA3BAB8179" bold="true">C.</emphasis>
Detail of the eyes (additional material);
<emphasis id="412D7288EBEBCE3F1FF6C9F4ECEFD6F1" bold="true">D.</emphasis>
Histological section of the tentacle (holotype);
<emphasis id="EBAADA0414B0678E3416E7D2D840F714" bold="true">E.</emphasis>
Histological section of the male copulatory organs (holotype);
<emphasis id="93B3A5FE1868A3B4B43F9A09DA705F13" bold="true">F.</emphasis>
Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands.
</paragraph>
</caption>
</subSubSection>
<subSubSection id="SECID0EJFAI" type="Reproductive system">
<paragraph id="74895B4059A0CF844F3161AB8D65D369">
<heading id="8EB74677B84928147DA6F3900F4A8205" reason="title">Reproductive system.</heading>
</paragraph>
<paragraph id="4CBEB6CC006EEC13F31183733EB47CB3">
Male reproductive complex directed backwards, composed of two spermiducal vesicles, a free prostatic vesicle, and an unarmed penis papilla (Fig.
<figureCitation id="72E869802F6F42BEB5DBA6333024B97E" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Plehnia cascaisensis sp. nov. Histological sections are postero-anteriorly oriented: A. Dorsal view of a living specimen (holotype, MNHNC MB 16-000107); B. Dorsal view of a living specimen (additional material, MB 16-000108); C. Detail of the eyes (additional material); D. Histological section of the tentacle (holotype); E. Histological section of the male copulatory organs (holotype); F. Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands." figureDoi="10.3897/zse.100.128211.figure6" httpUri="https://binary.pensoft.net/fig/1169819">6 E</figureCitation>
). Vas deferens run ventrally under the vagina and turn backwards once reached the pharynx. Vas deferens expand and distally form spermiducal vesicles. Spermiducal vesicles reach the prostatic vesicle separately and medially (Fig.
<figureCitation id="285AA60098842E13780D3292FD7AFAB0" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Plehnia cascaisensis sp. nov. (holotype, MNHNC MB 16-000107). Histological sections are postero-anteriorly oriented: A. Histological section of the long internal vagina (holotype); B. Histological section of the end of the internal vagina and Langs vesicle (holotype); C. Sagittal reconstruction of the reproductive system (holotype). Abbreviations: cg, cemental glands; ed, ejaculatory duct; el, epithelial lining; ev, external vagina; fp, female pore; i, intestine; iv, internal vagina; lv, Langs vesicle; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; sb, spermiducal bulbs; spv, spermiducal vesicle." figureDoi="10.3897/zse.100.128211.figure7" httpUri="https://binary.pensoft.net/fig/1169820">7 C</figureCitation>
). Prostatic vesicle large and pear-shaped (
<quantity id="3FF7C2CF16E85EE793BB7DB99D7F31D6" metricMagnitude="-4" metricUnit="m" metricValue="2.7" unit="mm" value="0.27">0.27 mm</quantity>
high and
<quantity id="7D2357E9EC25348D86A81C7D58F055A6" metricMagnitude="-4" metricUnit="m" metricValue="3.2" unit="mm" value="0.32">0.32 mm</quantity>
wide) with a smooth glandular lining and strong muscular wall (
<quantity id="4411AF6D98805BC23076C7EC401FF52C" metricMagnitude="-4" metricUnit="m" metricValue="1.2" unit="mm" value="0.12">0.12 mm</quantity>
thick). Numerous prostatic glands. Distally, a short penis papilla (
<quantity id="CBEDF21886CF59B4F29EF3FC417CD198" metricMagnitude="-4" metricUnit="m" metricValue="1.0" unit="mm" value="0.1">0.1 mm</quantity>
long) is housed in a shallow male atrium. Penis papilla surrounded by cap-shaped connective tissue.
</paragraph>
<caption id="61D5AAC3A3F46A838FEBC98CE9E5674C" ID-DOI="10.3897/zse.100.128211.figure7" ID-arpha="8D7D4458-B784-513C-AE7E-359A79E8F1BA" httpUri="https://binary.pensoft.net/fig/1169820" startId="F7">
<paragraph id="B4636B095AC173A6DA9CFEA8EBD5CC6E">
<label id="019F5C07774FB7C99C64787342F92CDA">Figure 7.</label>
</paragraph>
<paragraph id="11AE54CAB6DCD604B40041E11A873C4B">
<taxonomicName id="B89C2AA48868ED4EA2E68517DC6C1A5F" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="962B16E8544C1CDE849D9FFD2F0F7AE1" italics="true">Plehnia cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="065CDDA32824BA31A80D87467425726C" rank="species">sp. nov.</taxonomicNameLabel>
(holotype,
<specimenCode id="E4808BEBC41A5D5B4A1BBCCF2440345C">
<abbrev id="ABBRID0EKGAI" xlink_title="Museu Nacional de História Natural e da Ciência of Lisbon">MNHNC</abbrev>
MB 16-000107
</specimenCode>
). Histological sections are postero-anteriorly oriented:
<emphasis id="B497B88F714D1D9D6E7766D386EB3008" bold="true">A.</emphasis>
Histological section of the long internal vagina (holotype);
<emphasis id="201A0E9F40C9FF03FEBEDC7EB172EA8A" bold="true">B.</emphasis>
Histological section of the end of the internal vagina and Langs vesicle (holotype);
<emphasis id="0730979A98D94FE279A1AE2F81B3FA1F" bold="true">C.</emphasis>
Sagittal reconstruction of the reproductive system (holotype). Abbreviations: cg, cemental glands; ed, ejaculatory duct; el, epithelial lining; ev, external vagina; fp, female pore; i, intestine; iv, internal vagina; lv, Langs vesicle; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; sb, spermiducal bulbs; spv, spermiducal vesicle.
</paragraph>
</caption>
<paragraph id="73D57D21F9E73FE79E53FDC49858CA6A">
Female reproductive systems were large and completely developed in the studied animals (Figs
<figureCitation id="223282B100310112EE883020C97F02EC" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Plehnia cascaisensis sp. nov. Histological sections are postero-anteriorly oriented: A. Dorsal view of a living specimen (holotype, MNHNC MB 16-000107); B. Dorsal view of a living specimen (additional material, MB 16-000108); C. Detail of the eyes (additional material); D. Histological section of the tentacle (holotype); E. Histological section of the male copulatory organs (holotype); F. Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands." figureDoi="10.3897/zse.100.128211.figure6" httpUri="https://binary.pensoft.net/fig/1169819">6 F</figureCitation>
,
<figureCitation id="C2C136E998A36DAC4B2D44DA49435DE3" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Plehnia cascaisensis sp. nov. (holotype, MNHNC MB 16-000107). Histological sections are postero-anteriorly oriented: A. Histological section of the long internal vagina (holotype); B. Histological section of the end of the internal vagina and Langs vesicle (holotype); C. Sagittal reconstruction of the reproductive system (holotype). Abbreviations: cg, cemental glands; ed, ejaculatory duct; el, epithelial lining; ev, external vagina; fp, female pore; i, intestine; iv, internal vagina; lv, Langs vesicle; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; sb, spermiducal bulbs; spv, spermiducal vesicle." figureDoi="10.3897/zse.100.128211.figure7" httpUri="https://binary.pensoft.net/fig/1169820">7 A C</figureCitation>
). Wide external vagina (
<quantity id="B1FFCB862EEBE048219B2F4A29849F73" metricMagnitude="-5" metricUnit="m" metricValue="8.0" unit="mm" value="0.08">0.08 mm</quantity>
), but not bulbous (Fig.
<figureCitation id="B4A88171A06C258B096B67D46FE59098" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Plehnia cascaisensis sp. nov. Histological sections are postero-anteriorly oriented: A. Dorsal view of a living specimen (holotype, MNHNC MB 16-000107); B. Dorsal view of a living specimen (additional material, MB 16-000108); C. Detail of the eyes (additional material); D. Histological section of the tentacle (holotype); E. Histological section of the male copulatory organs (holotype); F. Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands." figureDoi="10.3897/zse.100.128211.figure6" httpUri="https://binary.pensoft.net/fig/1169819">6 F</figureCitation>
). Narrow, tube-like internal vagina ending in Langs vesicle. Langs vesicle is small (Fig.
<figureCitation id="C4CE77E459CBEAB6775A134C03DE9099" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Plehnia cascaisensis sp. nov. (holotype, MNHNC MB 16-000107). Histological sections are postero-anteriorly oriented: A. Histological section of the long internal vagina (holotype); B. Histological section of the end of the internal vagina and Langs vesicle (holotype); C. Sagittal reconstruction of the reproductive system (holotype). Abbreviations: cg, cemental glands; ed, ejaculatory duct; el, epithelial lining; ev, external vagina; fp, female pore; i, intestine; iv, internal vagina; lv, Langs vesicle; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; sb, spermiducal bulbs; spv, spermiducal vesicle." figureDoi="10.3897/zse.100.128211.figure7" httpUri="https://binary.pensoft.net/fig/1169820">7 B</figureCitation>
) and oval-shaped (
<quantity id="5B16C7AC27DF885D138941A9CB98122B" metricMagnitude="-5" metricUnit="m" metricValue="7" unit="mm" value="0.07">0.07 mm</quantity>
wide). The oviducts open in the distal region of the internal vagina.
</paragraph>
</subSubSection>
<subSubSection id="SECID0ELHAI" type="type locality">
<paragraph id="CED4A6C4112415896AF75953A8A8DE78">
<heading id="22DDE29D2403D2FD09B4295E4F2F6B5D" reason="title">Type locality.</heading>
</paragraph>
<paragraph id="3BC0F67B5E3F347517D0744FDF006748">
Cascais,
<collectingCountry id="66390275CBD5D78240026858043B9558" name="Portugal">Portugal</collectingCountry>
.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EQHAI" type="etymology">
<paragraph id="A1BF548FB813846A884FFB542B4F7289">
<heading id="196FA9ED4E16A10C5510DD43BA8DF296" reason="title">Etymology.</heading>
</paragraph>
<paragraph id="ACB10E312CEF35E7A17DCDFD67E3F46F">
The specific name is dedicated to Cascais, the area where the
<typeStatus id="84F75069995E52BAF88BA93F62E87D08" type="holotype">holotype</typeStatus>
was collected.
</paragraph>
</subSubSection>
<subSubSection id="SECID0EVHAI" type="remarks">
<paragraph id="3F7DE4CCFD2CF7F4E607B4140C873DAA">
<heading id="CFAA08173D1E230B08BD2F71A78FD3AC" reason="title">Remarks.</heading>
</paragraph>
<paragraph id="E58C086CA965E19C0190DC689AFD51CD">
The presence of a separate opening of the vas deferens into the neck of the prostatic vesicle, the smooth glandular lining, the absence of a seminal vesicle, the long female vagina, and the presence of a well-developed Langs vesicle allow the inclusion of the specimens in the genus
<taxonomicName id="7A6B56C15758AD4A8C9E59B59C0010CC" authorityName="Bock" authorityYear="1913" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="genus">
<emphasis id="AA7E71E652CBA4500AEE32165D5D5DFD" italics="true">Plehnia</emphasis>
</taxonomicName>
.
<taxonomicName id="C9013F1C816A181806CF8BC076D1063C" authorityName="Bock" authorityYear="1913" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="genus">
<emphasis id="425F6F4C2EC7362A71FBE8CD1CE00766" italics="true">Plehnia</emphasis>
</taxonomicName>
comprises four recognised species:
<taxonomicName id="14F953EC93EDA0DEC07DEC18DF07FADA" authority="(Plehn, 1896)" baseAuthorityName="Plehn" baseAuthorityYear="1896" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="arctica">
<emphasis id="70225E8FFD5A21703D99B31D7B6C5E2A" italics="true">Plehnia arctica</emphasis>
(
<bibRefCitation id="E437DA1ADF4E5D284DE9324D6C07B384" author="Plehn M" journalOrPublisher="Jenaische Zeitschrift" pagination="137-181" refId="B64" refString="Plehn M (1896) Neue Polycladen, gesammelt von Herrn Kapitan Chierchia bei der Erdumschiffung der Korvett Vettor Pisani, von Herrn Prof. Dr. Kukenthal im nordlichem Eismeer und von Herrn Prof Dr. Semon in Java. Jenaische Zeitschrift 30: 137 - 181." title="Neue Polycladen, gesammelt von Herrn Kapitan Chierchia bei der Erdumschiffung der Korvett Vettor Pisani, von Herrn Prof. Dr. Kukenthal im nordlichem Eismeer und von Herrn Prof Dr. Semon in Java." volume="30" year="1896">Plehn, 1896</bibRefCitation>
)
</taxonomicName>
,
<taxonomicName id="E5ED2FCC4BCFC4D2D29C55F5A86536E2" baseAuthorityName="Girard in Stimpson" baseAuthorityYear="1854" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ellipsoides">
<emphasis id="03947CF0E327B0100CB62F40234C1B80" italics="true">P. ellipsoides</emphasis>
</taxonomicName>
(Girard in
<bibRefCitation id="0A04562BF3C11F9BCDDEFD98E892C3FC" DOI="10.5962/bhl.title.11697" author="Stimpson W" refId="B80" refString="Stimpson W (1854) Synopsis of the marine invertebrate of Grand Manan: or the region about the mouth of the Bay of Fundy, New Brunswick. Smithsonian Contributions to Knowledge 4 or 6 (5): 1 - 67. https: // doi. org / 10.5962 / bhl. title. 11697" year="1854">Stimpson, 1854</bibRefCitation>
),
<taxonomicName id="C571778B98828908C17E3DA5A75B3B81" authority="Hyman, 1953" authorityName="Hyman" authorityYear="1953" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="caeca">
<emphasis id="93941131C88ECADFD2B565873991134A" italics="true">P. caeca</emphasis>
<bibRefCitation id="FEE5BEE949A6D35E4F871000B01E9858" author="Hyman LH" journalOrPublisher="Bulletin of the American Museum of Natural History" pagination="269-391" refId="B35" refString="Hyman LH (1953) The polyclad flatworms of the Pacific coast of North America. Bulletin of the American Museum of Natural History 100: 269 - 391." title="The polyclad flatworms of the Pacific coast of North America." volume="100" year="1953">Hyman, 1953</bibRefCitation>
</taxonomicName>
, and
<taxonomicName id="8C0FE314B7DDBF7A83B00C2179621B62" authority="Kato, 1937" authorityName="Kato" authorityYear="1937" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ovatus">
<emphasis id="10C084F347F7CF729F3E711A58479746" italics="true">P. ovatus</emphasis>
<bibRefCitation id="D0529DBF1B72973D70B3F24AFE6F9427" author="Kato K" journalOrPublisher="Japanese Journal of Zoology" pagination="347-371" refId="B40" refString="Kato K (1937) Thirteen new Polyclads from Misaki. Japanese Journal of Zoology 7: 347 - 371." title="Thirteen new Polyclads from Misaki." volume="7" year="1937">Kato, 1937</bibRefCitation>
</taxonomicName>
.
</paragraph>
<paragraph id="315DF1F0275193E26470ED2323F6FB26">
As shown in Table
<tableCitation id="2876534D271FE60D7843E8A3020403DA" captionStart="Table 3" captionStartId="T3" captionText="Table 3. Comparison among the species of the genus Plehnia." httpUri="http://table.plazi.org/id/2DACD56DE48E5CFB311479A0D1DD5153" tableUuid="2DACD56DE48E5CFB311479A0D1DD5153">3</tableCitation>
,
<taxonomicName id="89D43C6DEB7EAA31B2E4410D142DFB21" baseAuthorityName="Plehn" baseAuthorityYear="1896" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="arctica">
<emphasis id="13BA75574B29A97C970A428DA98D8DE8" italics="true">Plehnia arctica</emphasis>
</taxonomicName>
and
<taxonomicName id="EE294D0C4E3291C27986C915C81924C8" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="55DFBC37AC7DEB0973047A64959E9EB5" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="C5012EC4839976EEBB967B905B039D3D" rank="species">sp. nov.</taxonomicNameLabel>
share only the position of the pharynx. However, many characteristics of
<taxonomicName id="294371D39C9F645395608194634C0F3D" baseAuthorityName="Plehn" baseAuthorityYear="1896" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="arctica">
<emphasis id="42D6F589A8D94BC1305045C2F0139EF1" italics="true">P. arctica</emphasis>
</taxonomicName>
remain unclear due to its insufficient description. Notably, there are differences in size;
<taxonomicName id="96A4816FC9F6A8436569CE001369953A" baseAuthorityName="Plehn" baseAuthorityYear="1896" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="arctica">
<emphasis id="DEB2B62C8B63BF4D3BE2984BDFED5D85" italics="true">P. arctica</emphasis>
</taxonomicName>
is larger and lacks nuchal tentacles, whereas
<taxonomicName id="9863F8F1371E86CD6981A2A46A2657C9" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="E39B4FDAF6039DD639D1C0F72AA5E482" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="84DEB11C7802C0250D8380F6E6FEA795" rank="species">sp. nov.</taxonomicNameLabel>
is smaller and possesses tentacles.
</paragraph>
<caption id="2DACD56DE48E5CFB311479A0D1DD5153" ID-Table-UUID="2DACD56DE48E5CFB311479A0D1DD5153" httpUri="http://table.plazi.org/id/2DACD56DE48E5CFB311479A0D1DD5153" startId="T3" targetIsTable="true">
<paragraph id="CFBBC0690D1AE31AA9CAAACE5C393278">
<label id="9DB0869FCAADFE595DB5761E7E86589E">Table 3.</label>
</paragraph>
<paragraph id="95B58DA38D809CA04C2AAABB5392B2F6">
Comparison among the species of the genus
<taxonomicName id="30CACB7B4EE26A1F7FD825F471784A9F" authorityName="Bock" authorityYear="1913" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="genus">
<emphasis id="FDF1454F3E1E95F4F41CEEA617B7AF56" italics="true">Plehnia</emphasis>
</taxonomicName>
.
</paragraph>
</caption>
<paragraph id="E21299FE2D23A8F8B6F59134A86CAC86">
<table id="TID0ETRDI" rules="all">
<tbody id="B44E7A2A9106588FE6C6BDFC9498D199">
<tr id="541C7DBBE8DDB3022088ABED440B5C0C">
<th id="6E066E5C64FBC8B30606BD2715253374" colspan="1" isEmpty="true" rowspan="1">-</th>
<th id="FC4CAD770C193443BEE7B694E50BA4AF" colspan="1" rowspan="1">
<taxonomicName id="E3823F4B6B13E75B6E74DF068B3AD800" baseAuthorityName="Girard in Stimpson" baseAuthorityYear="1854" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ellipsoides">
<emphasis id="ED5B503F95195280538FD07EEA651CC7" italics="true">Plehnia ellipsoides</emphasis>
</taxonomicName>
(Girard in
<bibRefCitation id="036979C9A0D370F77DE749890E879F5F" DOI="10.5962/bhl.title.11697" author="Stimpson" firstAuthor="Stimpson" refId="B80" refString="Stimpson W (1854) Synopsis of the marine invertebrate of Grand Manan: or the region about the mouth of the Bay of Fundy, New Brunswick. Smithsonian Contributions to Knowledge 4 or 6 (5): 167. https://doi.org/10.5962/bhl.title.11697" year="1854">Stimpson 1854</bibRefCitation>
)
</th>
<th id="5CD0AC22B220972CFDFE5CA8AE8B3776" colspan="1" rowspan="1">
<taxonomicName id="4F8F907B15AEABB3CC34D9FA9F7A4560" authority="(Plehn, 1896)" baseAuthorityName="Plehn" baseAuthorityYear="1896" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="arctica">
<emphasis id="E4CE722C1BADFE0ED3E759B64CC1664C" italics="true">Plehnia arctica</emphasis>
(
<bibRefCitation id="33211737A8A5764657D2119F492D89F3" author="Plehn M" journalOrPublisher="Jenaische Zeitschrift" pagination="137-181" refId="B64" refString="Plehn M (1896) Neue Polycladen, gesammelt von Herrn Kapitan Chierchia bei der Erdumschiffung der Korvett Vettor Pisani, von Herrn Prof. Dr. Kukenthal im nordlichem Eismeer und von Herrn Prof Dr. Semon in Java. Jenaische Zeitschrift 30: 137 - 181." title="Neue Polycladen, gesammelt von Herrn Kapitan Chierchia bei der Erdumschiffung der Korvett Vettor Pisani, von Herrn Prof. Dr. Kukenthal im nordlichem Eismeer und von Herrn Prof Dr. Semon in Java." volume="30" year="1896">Plehn, 1896</bibRefCitation>
)
</taxonomicName>
</th>
<th id="983F5CE21B108728E15B3A4C81B5086A" colspan="1" rowspan="1">
<taxonomicName id="19278DF97057E67E67407B1C96B8113F" authority="Hyman, 1953" authorityName="Hyman" authorityYear="1953" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="caeca">
<emphasis id="A4637647CD1A75A9473863BBFA1AD7FD" italics="true">Plehnia caeca</emphasis>
<bibRefCitation id="F7FE6D5349E9EEC33A558DB5ADF62AFF" author="Hyman LH" journalOrPublisher="Bulletin of the American Museum of Natural History" pagination="269-391" refId="B35" refString="Hyman LH (1953) The polyclad flatworms of the Pacific coast of North America. Bulletin of the American Museum of Natural History 100: 269 - 391." title="The polyclad flatworms of the Pacific coast of North America." volume="100" year="1953">Hyman, 1953</bibRefCitation>
</taxonomicName>
</th>
<th id="E295DC48AAAEC968DAAB5B799A93C919" colspan="1" rowspan="1">
<taxonomicName id="671743F01B621A2FC26D86F3C7789612" authority="(Kato, 1937)" baseAuthorityName="Kato" baseAuthorityYear="1937" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ovatus">
<emphasis id="29C3AEB834CA6FA328ADB6A5C67F7635" italics="true">Plehnia ovatus</emphasis>
(
<bibRefCitation id="084906B626EA69FF8CC95E7FC174EA75" author="Kato K" journalOrPublisher="Japanese Journal of Zoology" pagination="347-371" refId="B40" refString="Kato K (1937) Thirteen new Polyclads from Misaki. Japanese Journal of Zoology 7: 347 - 371." title="Thirteen new Polyclads from Misaki." volume="7" year="1937">Kato, 1937</bibRefCitation>
)
</taxonomicName>
</th>
<th id="4ED4C2BD6393A72E12A086FAF462653F" colspan="1" rowspan="1">
<taxonomicName id="C83BC0EB42F26719B7C674B7FDE094B2" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="45B6E8D7C72D7132C3B89C0F9BDB288D" italics="true">Plehnia cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="EE492ECE7C8FE4A55170AED01759A300" rank="species">sp. nov.</taxonomicNameLabel>
</th>
</tr>
<tr id="C32CE7336B0EFDF5A822745246C9A120">
<td id="9E4595F180E6BB6B860CA8EC7ED873A9" colspan="1" rowspan="1">
<emphasis id="BE52335807FFE2378E7DF23E3A4E942F" bold="true">Shape of the body</emphasis>
</td>
<td id="92B0CD99FB28F64D38168761B8511F15" colspan="1" rowspan="1">Elliptical</td>
<td id="32A6BF426C66574560AC2D6B801AA1FA" colspan="1" rowspan="1">Oval</td>
<td id="53D792A070C591A65A4E6505A94F3941" colspan="1" rowspan="1">Elliptical</td>
<td id="C749CA148D7C62333FC8D1BE83EED01F" colspan="1" rowspan="1">Oval</td>
<td id="1400FBE33883D92A991EA0BC3B072C4F" colspan="1" rowspan="1">Elongated</td>
</tr>
<tr id="D8AA66C9F41FC1FE4B6D33B35362FD43">
<td id="81A6358E5B017C23C704B98F2C80DA36" colspan="1" rowspan="1">
<emphasis id="D13078D434CB6AF66E533B06748B8E2E" bold="true">Body length</emphasis>
</td>
<td id="AAE4A754642C62C3C00D4D9B6BB58B19" colspan="1" rowspan="1">25.4 mm</td>
<td id="D70F8B7466600043173F3EC7B8194575" colspan="1" rowspan="1">60 mm</td>
<td id="57A65D881F95E99BE670D06CE2736A05" colspan="1" rowspan="1">10-14 mm</td>
<td id="1F6EA68591B1990FA18C8397ED96E7F4" colspan="1" rowspan="1">4.5 mm long (fixed)</td>
<td id="8D59E1BCE788820D08B9FA268E4F9908" colspan="1" rowspan="1">9 mm (fixed)</td>
</tr>
<tr id="FAF0D6F1863D15D47AFC5579AA563B34">
<td id="8CB54956F306A6901FB7D7F57DBE603C" colspan="1" rowspan="1">
<emphasis id="FC17E3FA2E4F0581B8CE95CCEFBA7C83" bold="true">Dorsal colour</emphasis>
</td>
<td id="80CB4A781F8001F1964A3FB30F4A7B70" colspan="1" rowspan="1">Yellowish-brown</td>
<td id="B7CA32BDFB22E1DBE533AE2F511A88F4" colspan="1" rowspan="1">-</td>
<td id="EBAF86054613A95165860EF23B6BA3F2" colspan="1" rowspan="1">Whitish-greyish</td>
<td id="FEBFFD5D92E1ECF9E1F0647E9C1E7AFB" colspan="1" rowspan="1">Darkish brown</td>
<td id="92110251B228652E6F602F08ADA36ED0" colspan="1" rowspan="1">Yellowish-brown. Several brown spots scattered</td>
</tr>
<tr id="B3E89EF65FC5EB1836E5E1ADD9D7FD50">
<td id="1F3EA38D2D5F4421D057F0F9E9271283" colspan="1" rowspan="1">
<emphasis id="1CB4FAFDC94ACE5D15E651525B186797" bold="true">Ventral colour</emphasis>
</td>
<td id="4B3138A7883E41D31DF53D7D750005A3" colspan="1" rowspan="1">Grey</td>
<td id="27CEF1879AF6B3959F69CBA31ED8EB8F" colspan="1" rowspan="1">-</td>
<td id="AE3B4EAFE3D12445ABF890824B6F3A4F" colspan="1" rowspan="1">-</td>
<td id="38E85681964A37744AC7E6F3B74261AF" colspan="1" rowspan="1">-</td>
<td id="6C16A95F6BDCF447E5CBFCA43FD11CD8" colspan="1" rowspan="1">Pale yellow</td>
</tr>
<tr id="9385008944DC8AC42316B7B12C1377F0">
<td id="B3A0DB6282145E8E3B8BD0B07372BB6E" colspan="1" rowspan="1">
<emphasis id="F21E4D5AF75898A1B7B801E34B3E275A" bold="true">Nuchal tentacles</emphasis>
</td>
<td id="619B6B5C30DA44ECF204385E1063EDD2" colspan="1" rowspan="1">Absent</td>
<td id="9B8868F843FC2642CCEB4E89A0F29F15" colspan="1" rowspan="1">Absent</td>
<td id="4EB6FF989698D7EA07FD3E271E984F1C" colspan="1" rowspan="1">Absent</td>
<td id="5E987E8844281DB80D57B462592B4283" colspan="1" rowspan="1">Present</td>
<td id="D85075C2A787A3CBB5843204CD02727B" colspan="1" rowspan="1">Present</td>
</tr>
<tr id="44DAF763C7F43ECDAACF970188AB811C">
<td id="8BFA5D57442F00687EB7958255997515" colspan="1" rowspan="1">
<emphasis id="3A5CCDD6B6171E2EBE70CC0914BFA7D0" bold="true">Tentacular eyes</emphasis>
</td>
<td id="5E5806556F4C8A50946122B118F5E114" colspan="1" rowspan="1">Present</td>
<td id="D5E93EF203B6214C7FC9DA3B75F5FE3A" colspan="1" rowspan="1">Not seen</td>
<td id="C758BF906708168318D80CC4E2122163" colspan="1" rowspan="1">Absent</td>
<td id="ADE7D18EA05CB682DA920CB2A43FC363" colspan="1" rowspan="1">Present</td>
<td id="878E52EF3F889219259150618D19B640" colspan="1" rowspan="1">Present</td>
</tr>
<tr id="F7EA34ADE7346A3E23FC991CD26A902F">
<td id="7C05D6F38D8EA1C5CDF53ACC698D47E3" colspan="1" rowspan="1">
<emphasis id="0BF91181F63D7A55EDDFD4B74AE2398D" bold="true">Cerebral eyes</emphasis>
</td>
<td id="53DBCDD72173148D1527A2EFD4A0D598" colspan="1" rowspan="1">Present</td>
<td id="2027185720F87433610EC6F22F564A4E" colspan="1" rowspan="1">Not seen</td>
<td id="904E0A8DAE43B186540AAA4C2AEB7260" colspan="1" rowspan="1">Absent</td>
<td id="B478EABB0C2A51CB4BC878F5F0BBB1B5" colspan="1" rowspan="1">Present</td>
<td id="65A982104D43658BFAC479A04A84942B" colspan="1" rowspan="1">Present</td>
</tr>
<tr id="DF07101F3851932C77E3D5710CED703D">
<td id="835A825AD4E4E1456C8D8F9DD04EFDCC" colspan="1" rowspan="1">
<emphasis id="6C5409088761DEF536BA1FB2B5FCEBF9" bold="true">Marginal eyes</emphasis>
</td>
<td id="2E7F7399CCBD9A5E347BBE6FA8E919F9" colspan="1" rowspan="1">Present</td>
<td id="4C4883BCC26668C26ED94BCDCA6012D0" colspan="1" rowspan="1">Not seen</td>
<td id="3B90CB546A9DFA49168A150FA05BE633" colspan="1" rowspan="1">Absent</td>
<td id="8FA248A567AFD1DA7AD06BBE98F7E2A3" colspan="1" rowspan="1">Present</td>
<td id="65C76D559854A7B7A2443A5CCAAE3277" colspan="1" rowspan="1">Present</td>
</tr>
<tr id="43EB3A1A4EC0A21FBA3690A4D8B62BF4">
<td id="040895DB87DB02D51F05B6E526C34000" colspan="1" rowspan="1">
<emphasis id="3AD41C0CB079727C75FAA7A1858117B7" bold="true">Pharynx</emphasis>
</td>
<td id="1E0A1AB0BFA65F6A5C29C9B0736ACE7D" colspan="1" rowspan="1">Central</td>
<td id="812C6EC3AA17B41C07EF959622F8786A" colspan="1" rowspan="1">Behind the centre of the body</td>
<td id="F7787E76C28379DEA8080A0E4BA4942F" colspan="1" rowspan="1">“ … slightly posterior to the central area of the body ”</td>
<td id="AC1F195047CCFBAFDD0AA45DD88B90BA" colspan="1" rowspan="1">Central</td>
<td id="BFB541F624B404EB8BDDE85F24B6DC70" colspan="1" rowspan="1">Behind the centre of the body</td>
</tr>
<tr id="17D01D0C67DCF53BB7B5BA003CD67C57">
<td id="2743DCFB94C81C1A570CEDB04FBC60FE" colspan="1" rowspan="1">
<emphasis id="8D1F4060144D40AB5ADABB5FDD365C70" bold="true">Genital pores</emphasis>
</td>
<td id="0A87067838E732F45ED5E0B5EA67BB19" colspan="1" rowspan="1">Separated</td>
<td id="8D6F502A12CEBE398C7A29C9838BDDBF" colspan="1" rowspan="1">Separated</td>
<td id="B20BE975D184AF0622CADFF2A1A22CF5" colspan="1" rowspan="1">Separated</td>
<td id="E599B8C1BBA358B2B5E2E18044802B41" colspan="1" rowspan="1">Separated</td>
<td id="CEF334717C7F0D48F357265D1B239EB1" colspan="1" rowspan="1">Separated</td>
</tr>
<tr id="B4060DCE8520AB83D2CCBF647EB9954D">
<td id="DBEF7A57CDE6793B0779195B9F2FB187" colspan="1" rowspan="1">
<emphasis id="A427180126A8950003FED77E9C32B0BC" bold="true">Connection of the spermiducal vesicles with the prostatic vesicle</emphasis>
</td>
<td id="FE24E2B4A043C4524583D4D531205458" colspan="1" rowspan="1">Distal</td>
<td id="0DD75059232CFF36FCDF21F312F00282" colspan="1" rowspan="1">Distal</td>
<td id="72CA5CEAD583C2C629E2269F6AF903AD" colspan="1" rowspan="1">Medial</td>
<td id="30A788004A7F06875CA991925916AEE7" colspan="1" rowspan="1">Medial</td>
<td id="C297322DD581D2EE370520D447C8D6E7" colspan="1" rowspan="1">Medial</td>
</tr>
<tr id="DB320A7A25E7E3F13067EDEC4F44E1DB">
<td id="0ECE6FB0D14DE7174EB8958756109EC4" colspan="1" rowspan="1">
<emphasis id="034A0C0208BD6C871EF43CB046F4DE62" bold="true">Prostatic vesicle</emphasis>
</td>
<td id="C2ED309C508A64F7E5634AC8B93F1D38" colspan="1" rowspan="1">Large, bulbous</td>
<td id="9F0BE12D0B87D08E6855B37420746DCD" colspan="1" rowspan="1">-</td>
<td id="B607D64D47CD6B61E9A9BCA76E8799B4" colspan="1" rowspan="1">Pear-shaped</td>
<td id="7AE7A956FABFA4ADB553C8B498190B66" colspan="1" rowspan="1">Large</td>
<td id="BEBCDDC66C930601B5223E110A616FDD" colspan="1" rowspan="1">Pear-shaped</td>
</tr>
<tr id="59C1D68BBA1E590420BC5A9791EC1186">
<td id="65E1E4C308EC5DA722F1428E8BC43D2E" colspan="1" rowspan="1">
<emphasis id="935B18ACE4D6D40D4F6F6966D8626185" bold="true">External vagina</emphasis>
</td>
<td id="1692833E37F8C09B4AE19E11C4559016" colspan="1" rowspan="1">Strong</td>
<td id="7E7C54D3FC034E3638A1077925C506EE" colspan="1" rowspan="1">-</td>
<td id="A4D9547ABDFC0F2B5A2BF3B0D015EEE8" colspan="1" rowspan="1">Long and vertical</td>
<td id="ACFDE3CE22D38E20562C8A9B9823E0CD" colspan="1" rowspan="1">Strong</td>
<td id="45C3ECD35E524B794F25529953902C1E" colspan="1" rowspan="1">Wide</td>
</tr>
<tr id="B59FA2B5F7D243A185812321C35DCFE9">
<td id="F05AFD5AB4970ED110EF0A70969A0891" colspan="1" rowspan="1">
<emphasis id="D9FB2830556EBCEB20D0728B1BDDEC02" bold="true">Internal vagina</emphasis>
</td>
<td id="0D623E5BF28125637C248C4D764586EC" colspan="1" rowspan="1">Narrow and long</td>
<td id="0AF082527DF0B2B9617A08B404B40B58" colspan="1" rowspan="1">-</td>
<td id="6162794C74E03545AE49623FC0C75EC8" colspan="1" rowspan="1">Short and horizontal</td>
<td id="D56663C25E385794FD8AA00BF013BB2B" colspan="1" rowspan="1">Wide</td>
<td id="EF747F16C8BE709949D38A2678400F83" colspan="1" rowspan="1">Narrow and very long</td>
</tr>
<tr id="0767A0F803311F6F53707C1DD70EE8D7">
<td id="B900E24B8E08FE2DDC7B7C82F134E03A" colspan="1" rowspan="1">
<emphasis id="762EF457736D19F450DE564F9C17C292" bold="true">Langs vesicle</emphasis>
</td>
<td id="98D87A7D47044E117FC60FF310840225" colspan="1" rowspan="1">Elongated</td>
<td id="CD52341CA9CA893ED595E0F3073C6CB7" colspan="1" rowspan="1">-</td>
<td id="C5D9AB6C86171E70C34BA370E64E2E5A" colspan="1" rowspan="1">Absent</td>
<td id="B0856FBAC53A934F1B6A189A8A9F5CA2" colspan="1" rowspan="1">Large</td>
<td id="63545FC09C909620E9A80F8D13E11357" colspan="1" rowspan="1">Small and oval shaped</td>
</tr>
<tr id="25470D2740306F71FF5BCB0D423D59AE">
<td id="99A23260DF8E3328B281AFF4944C88E0" colspan="1" rowspan="1">
<emphasis id="4AAE57D4271A558C75BF1978D82FF69E" bold="true">Distribution</emphasis>
</td>
<td id="7F6EAC2E0BC3C5F32D0304C9526CDC4E" colspan="1" rowspan="1">USA, Canada</td>
<td id="BFF9460016944CD1E2DCEF1FABE9778A" colspan="1" rowspan="1">Norway, Greenland</td>
<td id="8441B6484E6B3914FA1983842FDCDA16" colspan="1" rowspan="1">California (USA)</td>
<td id="919136B2D1C13256F015D76F8C0BF41E" colspan="1" rowspan="1">Japan</td>
<td id="EE0BE4554A3D8A928AB07DCF8DBF7263" colspan="1" rowspan="1">Spain</td>
</tr>
<tr id="84CA938E691264521370716818BED84C">
<td id="E690C06EA1362CDF098B559C54B70854" colspan="1" rowspan="1">
<emphasis id="78AAB64ABA3946FC68096E712E9640CB" bold="true">References</emphasis>
</td>
<td id="91ABA132913C246FEEF987EE757580B7" colspan="1" rowspan="1">
<bibRefCitation id="0432BB2561C9F11D88C8E7DA3CE0D76B" DOI="10.5962/bhl.title.11697" author="Stimpson W" firstAuthor="Stimpson" refId="B80" refString="Stimpson W (1854) Synopsis of the marine invertebrate of Grand Manan: or the region about the mouth of the Bay of Fundy, New Brunswick. Smithsonian Contributions to Knowledge 4 or 6 (5): 167. https://doi.org/10.5962/bhl.title.11697" year="1854">Stimpson (1854)</bibRefCitation>
;
<bibRefCitation id="704606A14490352F338BA84F6472D1A6" author="Verrill AE" firstAuthor="Verrill" refId="B83" refString="Verrill AE (1893) Marine planarians of New England. Transactions of the Connecticut Academy of Arts and Sciences 8: 459520 [+ 5 plates (4044)]." year="1893">Verrill (1893)</bibRefCitation>
;
<bibRefCitation id="B1216044C8795ED714508AB13D4272DD" DOI="10.5479/si.00963801.89-3101.449" author="Hyman LH" firstAuthor="Hyman" journalOrPublisher="Proceedings of the United States National Museum" pagination="449-492" refId="B34" refString="Hyman LH (1940) The polyclad flatworms of the Atlantic Coast of the United States and Canada. Proceedings of the United States National Museum 89: 449492. https://doi.org/10.5479/si.00963801.89-3101.449" title="The polyclad flatworms of the Atlantic Coast of the United States and Canada." volume="89" year="1940">Hyman (1940)</bibRefCitation>
</td>
<td id="59ADFA017C38136FB01A8CE0B6169770" colspan="1" rowspan="1">
<bibRefCitation id="A1653B42D498E7C0722DD2C70A41D735" author="Plehn M" firstAuthor="Plehn" journalOrPublisher="Jenaische Zeitschrift" pagination="137-181" refId="B64" refString="Plehn M (1896) Neue Polycladen, gesammelt von Herrn Kapitan Chierchia bei der Erdumschiffung der Korvett Vettor Pisani, von Herrn Prof. Dr. Kukenthal im nordlichem Eismeer und von Herrn Prof Dr. Semon in Java. Jenaische Zeitschrift 30: 137181." title="Neue Polycladen, gesammelt von Herrn Kapitan Chierchia bei der Erdumschiffung der Korvett Vettor Pisani, von Herrn Prof. Dr. Kukenthal im nordlichem Eismeer und von Herrn Prof Dr. Semon in Java." volume="30" year="1896">Plehn (1896)</bibRefCitation>
;
<bibRefCitation id="8AD6DDD99C5FF08EC3D6C67B2AF03E38" author="Steinböck O" firstAuthor="Steinbock" journalOrPublisher="Fauna Arctica, Jena" pagination="295-342" refId="B77" refString="Steinböck O (1932) Die Turbellarien des arktischen Gebietes. In: Römer &amp; Schaudinn. Fauna Arctica, Jena 6: 295342." title="Die Turbellarien des arktischen Gebietes. In: Römer &amp; Schaudinn." volume="6" year="1932">Steinböck (1932)</bibRefCitation>
</td>
<td id="7C8A84C22CE687F0CE4E614E0E93B5AC" colspan="1" rowspan="1">
<bibRefCitation id="2D284D46AC6B25CD39DF7074D050DC77" author="Hyman" firstAuthor="Hyman" journalOrPublisher="Bulletin of the American Museum of Natural History" pagination="269-391" refId="B35" refString="Hyman LH (1953) The polyclad flatworms of the Pacific coast of North America. Bulletin of the American Museum of Natural History 100: 269391." title="The polyclad flatworms of the Pacific coast of North America." volume="100" year="1953">Hyman 1953</bibRefCitation>
</td>
<td id="ECBCD44DB9F09AD17F4B688153D09F98" colspan="1" rowspan="1">
<bibRefCitation id="2ADCFD6B5F4A453683CEC199390BF93D" author="Kato K" firstAuthor="Kato" journalOrPublisher="Japanese Journal of Zoology" pagination="347-371" refId="B40" refString="Kato K (1937) Thirteen new Polyclads from Misaki. Japanese Journal of Zoology 7: 347371." title="Thirteen new Polyclads from Misaki." volume="7" year="1937">Kato (1937)</bibRefCitation>
</td>
<td id="ADCAA5FEFC7C2B0C26A58567C677D133" colspan="1" rowspan="1">This study</td>
</tr>
</tbody>
</table>
</paragraph>
<paragraph id="9F4A44875673C86CFAD7F84387FE2103">
On the other hand, the new species exhibits certain similarities with
<taxonomicName id="398A97EC8FAEFAD9825410736E6EE457" baseAuthorityName="Girard in Stimpson" baseAuthorityYear="1854" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ellipsoides">
<emphasis id="C8991D9677AD941F08BF537E0E8F92B9" italics="true">P. ellipsoides</emphasis>
</taxonomicName>
(see Table
<tableCitation id="23719909723F55F30A12957EF458F800" captionStart="Table 3" captionStartId="T3" captionText="Table 3. Comparison among the species of the genus Plehnia." httpUri="http://table.plazi.org/id/2DACD56DE48E5CFB311479A0D1DD5153" tableUuid="2DACD56DE48E5CFB311479A0D1DD5153">3</tableCitation>
), including the presence of tentacular, cerebral, and marginal eyespots, as well as similar background colouration. Substantial differences emerge, such as the absence of tentacles in
<taxonomicName id="7A33C2AF2EA0BA598779712773A0B376" baseAuthorityName="Girard in Stimpson" baseAuthorityYear="1854" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ellipsoides">
<emphasis id="8723BCFE3646D920408A891400563F94" italics="true">P. ellipsoides</emphasis>
</taxonomicName>
and the position of the spermiducal vesicles opening into the prostatic vesicle, which is distally positioned in
<taxonomicName id="70EC3FF9094BB15976C56E50272D9BF8" baseAuthorityName="Girard in Stimpson" baseAuthorityYear="1854" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ellipsoides">
<emphasis id="A8084DC56533DA5E967C9B9A29DD8E99" italics="true">P. ellipsoides</emphasis>
</taxonomicName>
and medially positioned in
<taxonomicName id="1054B7D4634058524D3B16A02256D32E" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="5041E3EB1BF1821863DF91809AD00A61" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="3955F46C686A30810B2B8BBB2BFDD2CD" rank="species">sp. nov.</taxonomicNameLabel>
Additionally, differences in the female reproductive system exist;
<taxonomicName id="D2D06DAE054DC72D5CED2A1422E214A8" baseAuthorityName="Girard in Stimpson" baseAuthorityYear="1854" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ellipsoides">
<emphasis id="89A268C5CCBF48E79DED60382B27842C" italics="true">P. ellipsoides</emphasis>
</taxonomicName>
has a strong external vagina and an elongated Langs vesicle, whereas the new species from Cascais has a wide external vagina and a small, rounded Langs vesicle.
</paragraph>
<paragraph id="95D1E21300E35E899A8D0E1979723831">
<taxonomicName id="1514B5C5982C1981F989E83645007837" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="3D06F8C46EFDECC37553A9454CF7E357" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="32F7DA94B05BF8F1F961F494E637C8FE" rank="species">sp. nov.</taxonomicNameLabel>
and
<taxonomicName id="B73AC1A7A1300C0CCD664ECC49286651" baseAuthorityName="Kato" baseAuthorityYear="1937" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ovatus">
<emphasis id="313A629690D924AFDAD320BA787E551D" italics="true">P. ovatus</emphasis>
</taxonomicName>
are the only
<taxonomicName id="46D12A249F7FC9FDA613F4498285234B">
<emphasis id="05BF25D5297AE7DAE82E0F3DA5962BDB" italics="true">Plehnia</emphasis>
species
</taxonomicName>
that share the presence of tentacles and the position of the opening of the spermiducal vesicles into the prostatic vesicle (see Table
<tableCitation id="7D514E2D446758BE900B4B9B8C910111" captionStart="Table 3" captionStartId="T3" captionText="Table 3. Comparison among the species of the genus Plehnia." httpUri="http://table.plazi.org/id/2DACD56DE48E5CFB311479A0D1DD5153" tableUuid="2DACD56DE48E5CFB311479A0D1DD5153">3</tableCitation>
). Nonetheless,
<taxonomicName id="66D9F285DE546F4E08B550FC1CB99A3C" baseAuthorityName="Kato" baseAuthorityYear="1937" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ovatus">
<emphasis id="6C44CF8AB186DABF27472DEF281762E4" italics="true">P. ovatus</emphasis>
</taxonomicName>
is smaller and possesses an oval body shape, resembling that of
<taxonomicName id="B2F14AF7086BA133668145E8037F42F9" authorityName="Stimpson" authorityYear="1857" family="Stylochidae" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="family">Stylochidae</taxonomicName>
species (see fig.
<quantity id="0846286532F6C5411AC6A8F037B36199" metricMagnitude="-1" metricUnit="m" metricValue="1.016" unit="in" value="4.0">4 in</quantity>
<bibRefCitation id="E967BBD7EC051DE3114F646E91C69238" author="Kato" firstAuthor="Kato" journalOrPublisher="Japanese Journal of Zoology" pagination="347-371" refId="B40" refString="Kato K (1937) Thirteen new Polyclads from Misaki. Japanese Journal of Zoology 7: 347371." title="Thirteen new Polyclads from Misaki." volume="7" year="1937">Kato 1937</bibRefCitation>
). In contrast,
<taxonomicName id="9A663CA0FCD9750B0B38916508D6587A" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="DF49DCFEFC72976D001407B796AAAB19" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="BAA4910F9AC301A21F96D507C0B1DD1B" rank="species">sp. nov.</taxonomicNameLabel>
is elongated and narrower (Fig.
<figureCitation id="6F1B5BD0188B73B15AA7768F7D3F5982" captionStart="Figure 6" captionStartId="F6" captionText="Figure 6. Plehnia cascaisensis sp. nov. Histological sections are postero-anteriorly oriented: A. Dorsal view of a living specimen (holotype, MNHNC MB 16-000107); B. Dorsal view of a living specimen (additional material, MB 16-000108); C. Detail of the eyes (additional material); D. Histological section of the tentacle (holotype); E. Histological section of the male copulatory organs (holotype); F. Histological section of the male and female organs (holotype). Abbreviations: cg, cemental glands; el, epithelial lining; ev, external vagina; fp, female pore; iv, internal vagina; ma, male atrium; mp, male pore; mw, muscular wall; ov, oviduct; ph, pharynx; pp, penis papilla; pv, prostatic vesicle; t, tentacle; vg, vesicular glands." figureDoi="10.3897/zse.100.128211.figure6" httpUri="https://binary.pensoft.net/fig/1169819">6 A</figureCitation>
). The dorsal pigmentation also differs, with
<taxonomicName id="D50C06F49D4D36A74265AD0C5D271391" baseAuthorityName="Kato" baseAuthorityYear="1937" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ovatus">
<emphasis id="98B1B4EBA84EFD9E4C419050799A771D" italics="true">P. ovatus</emphasis>
</taxonomicName>
being darkish brown and
<taxonomicName id="97933D46196E09A29031AD659E433816" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="FA4700CFB75476B69A664898E31DBAE0" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="AFAA51FF6A7BE6AC369429C68D2F7B71" rank="species">sp. nov.</taxonomicNameLabel>
being yellowish brown, displaying a spotted pattern. In
<taxonomicName id="1328CE92DD17F2AD6620313A1D46091E" baseAuthorityName="Kato" baseAuthorityYear="1937" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="ovatus">
<emphasis id="89F19ABE11B9F1AB544608BD96F0F7BA" italics="true">P. ovatus</emphasis>
</taxonomicName>
, the prostatic vesicle is elongated, and the penis papilla opens into a large male atrium lined with ciliated cells. In
<taxonomicName id="3126B9D317B298EAD69D205257E3ED46" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis">
<emphasis id="2198CA1E2D09D4C8592F78B7AB141965" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
, the vesicles are rounder and wider, and the penis papilla is contained within a shallow male atrium. The Langs vesicle in the Japanese species is larger than that in the Iberian species.
</paragraph>
<paragraph id="BAD20D46555EC99615F5801F982B1334">
<taxonomicName id="B39A6B3EC2F7D9B57409CEABC6B64E4E" authorityName="Hyman" authorityYear="1953" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="caeca">
<emphasis id="1F7E8EF9B83031BBBE5768EC8883A84D" italics="true">P. caeca</emphasis>
</taxonomicName>
and
<taxonomicName id="F4C410F89CA42F9DF6460A6D8E88C532" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis">
<emphasis id="1B7A85F2CB331F6BB9B833B7B823F865" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
differ externally and within the reproductive system, mainly in the female system.
<taxonomicName id="BB861520D1492796B7C8A9665B8385EB" authorityName="Hyman" authorityYear="1953" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="caeca">
<emphasis id="62E5012174447F138849F48C561DCC5C" italics="true">P. caeca</emphasis>
</taxonomicName>
lacks eyes and tentacles and has an elongated and less muscular prostatic vesicle.
<taxonomicName id="6F268482EF53E3B86CBE0853ECD50F86" authorityName="Hyman" authorityYear="1953" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="caeca">
<emphasis id="03014D95CFB2422E294257DEAD4F1AB9" italics="true">P. caeca</emphasis>
</taxonomicName>
also lacks a Langs vesicle, and the oviducts empty into the proximal region of the internal vagina. In contrast,
<taxonomicName id="51294FB02C3A8BDFE1EF639D0674E234" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis">
<emphasis id="5561EBC90DE8B436EB3A77A26620AE4C" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
has a well-developed Lang vesicle and oviducts that empty into the distal region of the internal vagina.
</paragraph>
<paragraph id="FE2772C262825E53C78E687019E0B898">
All of these differences, as well as the unique characteristics of
<taxonomicName id="FDE37C0767111D1229B09EEF329A90D5" authorityName="Pérez-García &amp; Gouveia &amp; Calado &amp; Noreña &amp; Cervera" authorityYear="2024" class="Trematoda" family="Plehniidae" genus="Plehnia" kingdom="Animalia" order="Polycladida" phylum="Platyhelminthes" rank="species" species="cascaisensis" status="sp. nov.">
<emphasis id="ACF273B0767FA253046C8AD29DC6C08A" italics="true">P. cascaisensis</emphasis>
</taxonomicName>
<taxonomicNameLabel id="8C168D057885FBF88C39521FAAA4CCA5" rank="species">sp. nov.</taxonomicNameLabel>
, such as its spotted dorsal pattern, wide external vagina, and long internal vagina, led us to consider the specimens from Cascais as a distinct species.
</paragraph>
</subSubSection>
<subSubSection id="SECID0ECDBI" type="biology">
<paragraph id="130D8BE3B555612B1AF746ACF71FA367">
<heading id="95141031DF635F9710B7E21BF2EE3601" reason="title">Biology.</heading>
</paragraph>
<paragraph id="061F12AAF03B30648BB2F347CEA2117C">
collected in a rocky area covered by a reef of
<taxonomicName id="C99D48B5FB764C89B9C720BA36CC10B2" authority="Lamarck 1818" authorityName="Lamarck" authorityYear="1818" class="Polychaeta" family="Sabellariidae" genus="Sabellaria" kingdom="Animalia" order="Terebellida" phylum="Annelida" rank="genus">
<emphasis id="23414CC36D606A5F193626CA7C43DC24" italics="true">Sabellaria</emphasis>
Lamarck 1818
</taxonomicName>
(Annelida,
<taxonomicName id="3AF2E98BB6F3E48CA864B53991D45F77" authorityName="Grube" authorityYear="1850" class="Polychaeta" kingdom="Animalia" phylum="Annelida" rank="class">Polychaeta</taxonomicName>
).
</paragraph>
</subSubSection>
<subSubSection id="SECID0EZDBI" type="distribution">
<paragraph id="AA1082C95F324588BDB6A7AA01620882">
<heading id="BEA2707A2245EC54726AD0302A40A22D" reason="title">Distribution.</heading>
</paragraph>
<paragraph id="C0357A8AC2EA33E2807006C8F64E98AD">
only known from Cascais,
<collectingCountry id="CFB276EA2D3F6E7B76D165A39456D57D" name="Portugal">Portugal</collectingCountry>
.
</paragraph>
</subSubSection>
</treatment>
</document>