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<document ID-DOI="http://dx.doi.org/10.3897/zse.100.117956" ID-Pensoft-Pub="1860-0743-2-357" ID-Pensoft-UUID="2E99466826035DE19518BCE1FB6606CC" ID-ZooBank="9ED1E92303F74EA2906B76A828481099" ModsDocID="1860-0743-100-2-357" checkinTime="1712193101765" checkinUser="pensoft" docAuthor="Garcia Facal, Guillermina, Ivanov, Veronica A. &amp; Menoret, Adriana" docDate="2024" docId="5D4BFD62D22E5D348C6F602ACF3C6187" docLanguage="en" docName="ZoosystEvol 100(2): 357-372" docOrigin="Zoosystematics and Evolution 100 (2)" docPubDate="2024-04-03" docSource="http://dx.doi.org/10.3897/zse.100.117956" docTitle="Rockacestus blasi García Facal &amp; Ivanov &amp; Menoret 2024, sp. nov." docType="treatment" docUuid="E014EFBD-32EB-489A-9449-B1E5B4D45A9D" docUuidSource="ZooBank" docVersion="1" id="2E99466826035DE19518BCE1FB6606CC" lastPageNumber="357" masterDocId="2E99466826035DE19518BCE1FB6606CC" masterDocTitle="New species of Rockacestus (Cestoda, Phyllobothriidea) from skates of the genus Bathyraja (Rajiformes, Arhynchobatidae) in the Southwestern Atlantic Ocean with comments on the distribution of the genus" masterLastPageNumber="372" masterPageNumber="357" pageNumber="357" updateTime="1712193101765" updateUser="pensoft">
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<mods:title id="F5838FFBABDF18E16FF1A2244601820A">New species of Rockacestus (Cestoda, Phyllobothriidea) from skates of the genus Bathyraja (Rajiformes, Arhynchobatidae) in the Southwestern Atlantic Ocean with comments on the distribution of the genus</mods:title>
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<mods:namePart id="27547D31DEF043F92709606E243F4D52">Garcia Facal, Guillermina</mods:namePart>
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<mods:affiliation id="6A3CD0D188E204AB41ED77BEA04B9A1E">Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biologia Experimental, Laboratorio de Sistematica y Biologia de Parasitos de Organismos Acuaticos (SIBIPOA), Buenos Aires, Argentina &amp; CONICET-Universidad de Buenos Aires, Instituto de Biodiversidad y Biologia Experimental (IBBEA), Buenos Aires, Argentina</mods:affiliation>
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<mods:namePart id="5017EF329F1F861FE1BF49B3837240A4">Ivanov, Veronica A.</mods:namePart>
<mods:affiliation id="2C718D2ABE7859ED6B0FB25E2763B35E">Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biologia Experimental, Laboratorio de Sistematica y Biologia de Parasitos de Organismos Acuaticos (SIBIPOA), Buenos Aires, Argentina &amp; CONICET-Universidad de Buenos Aires, Instituto de Biodiversidad y Biologia Experimental (IBBEA), Buenos Aires, Argentina</mods:affiliation>
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<mods:namePart id="409F4E6D267E7D637414AE3850C5A561">Menoret, Adriana</mods:namePart>
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<mods:affiliation id="D0AFFD613D1E41E05063C9932D52B877">Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Biodiversidad y Biologia Experimental, Laboratorio de Sistematica y Biologia de Parasitos de Organismos Acuaticos (SIBIPOA), Buenos Aires, Argentina &amp; CONICET-Universidad de Buenos Aires, Instituto de Biodiversidad y Biologia Experimental (IBBEA), Buenos Aires, Argentina</mods:affiliation>
<mods:nameIdentifier id="7E2F1F453E2453ED169932623DA34308" type="email">menoret.a@gmail.com</mods:nameIdentifier>
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<treatment id="5D4BFD62D22E5D348C6F602ACF3C6187" LSID="urn:lsid:zoobank.org:act:E014EFBD-32EB-489A-9449-B1E5B4D45A9D" httpUri="http://treatment.plazi.org/id/5D4BFD62D22E5D348C6F602ACF3C6187" lastPageNumber="357" pageId="0" pageNumber="357">
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<paragraph id="36721BB5B12B9ACFB45A8D66DD322B71" pageId="0" pageNumber="357">
<taxonomicName id="4C426C5CA8FD7570E68E5D7FBD3A4775" LSID="https://zoobank.org/E014EFBD-32EB-489A-9449-B1E5B4D45A9D" authority="García Facal &amp; Ivanov &amp; Menoret, 2024" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi" status="sp. nov.">Rockacestus blasi</taxonomicName>
<taxonomicNameLabel id="8434DB555A4D233FCC69CA0819E52532" pageId="0" pageNumber="357">sp. nov.</taxonomicNameLabel>
</paragraph>
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<subSubSection id="756E2C8C96733FF80A22208296CCA6D9" pageId="0" pageNumber="357" type="description">
<paragraph id="259CB5E8DFA0EE9BBA869C430A1C9A0F" pageId="0" pageNumber="357">
<figureCitation id="244AC446E62164B58E5C0A27B4993348" captionStart="Figure 1" captionStartId="F1" captionText="Figure 1. Light micrographs of whole worms of Rockacestus from the Southwestern Atlantic Ocean. A. Rockacestus blasi sp. nov. (holotype MACN-Pa No. 783) from Bathyraja macloviana; B. Rockacestus magellanicus sp. nov. (holotype MACN-Pa No. 789) from Bathyraja magellanica; C. Rockacestus ottavianoi sp. nov. (holotype MACN-Pa 793) from Bathyraja magellanica." figureDoi="10.3897/zse.100.117956.figure1" httpUri="https://binary.pensoft.net/fig/1014939" pageId="0" pageNumber="357">Figs 1A</figureCitation>
<figureCitation id="A473548D4494B00187F6A8101180FF28" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">, 2</figureCitation>
<figureCitation id="21F8AAE9FB0413B0BB1436EB46F16386" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">, 3</figureCitation>
<figureCitation id="50064676028909EEE7D8B44A0A4EFBFE" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Light micrographs of cross-sections of mature proglottids of species of Rockacestus off Argentina. A-C. Rockacestus blasi sp. nov.; A. At the level of the testes, anterior to the cirrus sac; B. At the level of the cirrus sac; C. At the level of ovarian isthmus; D-F. Rockacestus magellanicus sp. nov.; D. At the level of the testes, anterior to the cirrus sac; E. At the level of the cirrus sac; F. At the level of ovarian isthmus; G-I. Rockacestus ottavianoi sp. nov; G. At the level of the testes, anterior to the cirrus sac; H. At the level of the cirrus sac; I. At the level of ovarian isthmus; cs - cirrus sac; oc - ovicapt; ov - ovary; sr - seminal receptacle; t - testes; u - uterus; ut - uteroduct; vd - vas deferens; vf - vitelline follicle; vg - vagina; vod - ventral osmoregulatory duct." figureDoi="10.3897/zse.100.117956.figure7" httpUri="https://binary.pensoft.net/fig/1014945" pageId="0" pageNumber="357">, 7A-C</figureCitation>
<figureCitation id="65FCFB5BB30D821F6FE69DBA39672DC5" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Light micrographs of scoleces of Rockacestus blasi sp. nov. A. Bothridia fixed while still attached to the host tissue (paratype MACN-Pa No. 787); B. Bothridia properly relaxed and fixed (paratype MACN-Pa No. 784 / 2)." figureDoi="10.3897/zse.100.117956.figure8" httpUri="https://binary.pensoft.net/fig/1014946" pageId="0" pageNumber="357">, 8</figureCitation>
</paragraph>
</subSubSection>
<subSubSection id="85927A041307C7CED603642668178AEA" pageId="0" pageNumber="357" type="type material">
<paragraph id="4FF83AC018FD7A0412593C491594DD5C" pageId="0" pageNumber="357">Type material.</paragraph>
<paragraph id="831400A3950145D4BD328B2A295CC58D" pageId="0" pageNumber="357">
<emphasis id="B34CE0D245ADFAF4C11D4BEDB8C8C0BD" bold="true" italics="true" pageId="0" pageNumber="357">Holotype</emphasis>
whole mature worm, off Villa Gesell, Buenos Aires Province, Argentina (
<geoCoordinate id="C7526CFAD869E6F61C9360DA582000E2" degrees="37" direction="south" minutes="33.10" orientation="latitude" precision="9" value="-37.551666">37°33.10'S</geoCoordinate>
,
<geoCoordinate id="9C578A4732652BFA99DB91B5EA393CC8" degrees="55" direction="west" minutes="19.20" orientation="longitude" precision="9" value="-55.32">55°19.20'W</geoCoordinate>
), 98.7 m, 06 Aug. 2012, A. Menoret leg., MACN-Pa No. 783.
</paragraph>
<paragraph id="CE66A3EF6224147A19B019CE1247718D" pageId="0" pageNumber="357">
<emphasis id="676464E9BBDDB61B9CFF10325EAAC2FE" bold="true" italics="true" pageId="0" pageNumber="357">Paratypes</emphasis>
1 whole mature worm, 1 whole gravid worm, 1 detached gravid proglottid, same data as holotype, MACN-Pa Nos. 784/1-3. One detached gravid proglottid, same data as for preceding, MLP-He No. 8097. One whole mature worm, 1 detached gravid proglottid, off
<normalizedToken id="F2FB964B110BD25B3FB284949CEED9D3" originalValue="Río">Rio</normalizedToken>
Grande, Tierra del Fuego Province, Argentina (
<geoCoordinate id="BB788034A4D24C9E9C4B747AC9641382" degrees="54" direction="south" minutes="29.50" orientation="latitude" precision="9" value="-54.491665">54°29.50'S</geoCoordinate>
,
<geoCoordinate id="BAF28E37A409F29B0296F34CB4663CF8" degrees="65" direction="west" minutes="3.16" orientation="longitude" precision="9" value="-65.052666">65°3.16'W</geoCoordinate>
), 133 m, 16 Mar. 2011, V. A. Ivanov &amp; A. Menoret leg., MACN-Pa Nos. 786/1-2. Nine whole gravid worms, cross-section of 2 attached mature proglottid, off Necochea, Buenos Aires Province, Argentina (
<geoCoordinate id="A4BEA7EFD6C9AEBB20C8AA4C3925278A" degrees="39" direction="south" minutes="52.64" orientation="latitude" precision="9" value="-39.877335">39°52.64'S</geoCoordinate>
,
<geoCoordinate id="1D0F9EA8C1DB517AF5128025FDDA1148" degrees="56" direction="west" minutes="38.72" orientation="longitude" precision="9" value="-56.645332">56°38.72'W</geoCoordinate>
), 91.3 m, 27 Mar. 2011, V. A. Ivanov &amp; A. Menoret leg., MACN-Pa Nos. 785/1-9, 785/11-24. Three whole gravid worms, same data as for preceding, MLP-He No. 8096. One whole gravid worm, off Necochea, Buenos Aires Province, Argentina (
<geoCoordinate id="A22186BBF38F646469047299098EA4B0" degrees="39" direction="south" minutes="53.99" orientation="latitude" precision="9" value="-39.899834">39°53.99'S</geoCoordinate>
,
<geoCoordinate id="B18002A9105445C4C41BBD1206C3C3B9" degrees="57" direction="west" minutes="0.64" orientation="longitude" precision="9" value="-57.010666">57°0.64'W</geoCoordinate>
), 94 m, same data as for preceding, MACN-Pa No. 785/10. One whole immature worm, off the Marine Protected Area
<normalizedToken id="9F1E7DD47AB23117C0B023904570703F" originalValue="Namuncurá">Namuncura</normalizedToken>
/Burdwood Bank, Argentina (
<geoCoordinate id="3A36B8194EDC2CB0839A7D843C69F445" degrees="53" direction="south" minutes="55.92" orientation="latitude" precision="9" value="-53.932">53°55.92'S</geoCoordinate>
,
<geoCoordinate id="8685D5148790679382FA820EA2677140" degrees="61" direction="west" minutes="31.93" orientation="longitude" precision="9" value="-61.532166">61°31.93'W</geoCoordinate>
), 184 m, 19 Apr. 2016, A. Menoret leg., MACN-Pa No. 787.
</paragraph>
</subSubSection>
<subSubSection id="3CE6FE843F65E84A9D2B3B68685BF579" pageId="0" pageNumber="357" type="description">
<paragraph id="76733AC1BC0D0D7A694CB3623BFCED3A" pageId="0" pageNumber="357">Description.</paragraph>
<paragraph id="8E8F83BF009D9F20C6ED5828B1FC9DB9" pageId="0" pageNumber="357">
Based on 18 specimens (14 whole gravid worms, 3 whole mature worms, 1 immature worm), 3 detached gravid proglottids, cross-sections of 1 mature proglottid, and 3 scoleces examined with SEM. Worms apolytic, proglottids craspedote. Specimens possessing mature proglottids, 26.8-45.2 (35.7
<normalizedToken id="F95FD8AB8D44A7CA825BD7A58FC8078C" originalValue="±">+/-</normalizedToken>
9.2, n = 3) mm long, 140-204 (163
<normalizedToken id="7C97E620ABDAF86C5524298A27198C39" originalValue="±">+/-</normalizedToken>
36, n = 3) proglottids per worm. Specimens possessing gravid proglottids, 22.3-50.9 (36.1
<normalizedToken id="A6640EAC1DDF626041DC7029974518E2" originalValue="±">+/-</normalizedToken>
7.6, n = 14) mm long, 106-162 (128
<normalizedToken id="B09710ED8B5862D22478DD611B71B904" originalValue="±">+/-</normalizedToken>
18, n = 14) proglottids per worm (Fig.
<figureCitation id="B68F05A13D7E241A4E116734C7BBF39E" captionStart="Figure 1" captionStartId="F1" captionText="Figure 1. Light micrographs of whole worms of Rockacestus from the Southwestern Atlantic Ocean. A. Rockacestus blasi sp. nov. (holotype MACN-Pa No. 783) from Bathyraja macloviana; B. Rockacestus magellanicus sp. nov. (holotype MACN-Pa No. 789) from Bathyraja magellanica; C. Rockacestus ottavianoi sp. nov. (holotype MACN-Pa 793) from Bathyraja magellanica." figureDoi="10.3897/zse.100.117956.figure1" httpUri="https://binary.pensoft.net/fig/1014939" pageId="0" pageNumber="357">1A</figureCitation>
). Maximum width at level of scolex or immature proglottid. Scolex composed of 4 bothridia, 400-830 (621
<normalizedToken id="B644233588A2E2A1821159ED6BD9E2A6" originalValue="±">+/-</normalizedToken>
127, n = 17) long, 580-1,220 (891
<normalizedToken id="118C206CFBBF0898CFF3937B7EE556BC" originalValue="±">+/-</normalizedToken>
193, n = 17) wide. Bothridia folded, 375-685 (506
<normalizedToken id="7A95118C72C84ADF90C83E32127A8050" originalValue="±">+/-</normalizedToken>
100, n = 8) long, 425-750 (571
<normalizedToken id="5356A6F8382906D88427B1309C029ACF" originalValue="±">+/-</normalizedToken>
113, n = 8) wide when folded, sessile anteriorly, free posteriorly; with apical sucker and marginal loculi (Figs
<figureCitation id="139DF885155B4FC184E882DA8D93700E" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2A</figureCitation>
,
<figureCitation id="3868EBCE3157097920BB64B924C5346B" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3A</figureCitation>
,
<figureCitation id="FBFBD9F9C258FF8978FBEFA741B098E5" captionStart="Figure 8" captionStartId="F8" captionText="Figure 8. Light micrographs of scoleces of Rockacestus blasi sp. nov. A. Bothridia fixed while still attached to the host tissue (paratype MACN-Pa No. 787); B. Bothridia properly relaxed and fixed (paratype MACN-Pa No. 784 / 2)." figureDoi="10.3897/zse.100.117956.figure8" httpUri="https://binary.pensoft.net/fig/1014946" pageId="0" pageNumber="357">8B</figureCitation>
). Posterior part of each bothridium with weak depression surrounded by circular band of muscle (Fig.
<figureCitation id="996B18583C278C54E8A9488A50B7161D" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2A</figureCitation>
). Apical sucker, 80-123 (107
<normalizedToken id="972B7F680EAADADAA409B3B8EEADE001" originalValue="±">+/-</normalizedToken>
14, n = 13) long, 85-135 (113
<normalizedToken id="18476C3C0484397CD2FF871380CDBE83" originalValue="±">+/-</normalizedToken>
13, n = 13) wide (Figs
<figureCitation id="0F46805DB459A97459B34BE70D614286" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2A</figureCitation>
,
<figureCitation id="E8EA824ED443E8675D03EC29F4986438" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3A, B</figureCitation>
). Cephalic peduncle, absent. Neck 8.8-18.5 (14.0
<normalizedToken id="10803D63B9F13262ED1FF777BA6EA1D3" originalValue="±">+/-</normalizedToken>
3.0, n = 17) mm long.
</paragraph>
<caption id="01138CC37D27AFF211F8656962882199" doi="10.3897/zse.100.117956.figure1" httpUri="https://binary.pensoft.net/fig/1014939" pageId="0" pageNumber="357" start="Figure 1" startId="F1">
<paragraph id="F72F2B8A3A68ECBC014FC2DC7C1CA062" pageId="0" pageNumber="357">
<emphasis id="204A56C5BD9BEB858677DC09BC78A6A3" bold="true" pageId="0" pageNumber="357">Figure 1.</emphasis>
Light micrographs of whole worms of
<taxonomicName id="B658F4FD0377628633A9E43056B40701" authorityName="Caira, Bueno &amp; Jensen" authorityYear="2021" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="genus">
<emphasis id="50E0F6B9DEE961C5B230EFF99CC0CB89" italics="true" pageId="0" pageNumber="357">Rockacestus</emphasis>
</taxonomicName>
from the Southwestern Atlantic Ocean.
<emphasis id="8101767007E642BB725CD1F6E01D4BD7" bold="true" pageId="0" pageNumber="357">A.</emphasis>
<taxonomicName id="A606B8AA7BBA5615FECED72888422A86" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="7573C7A55DC1E20C65898D5682D4EE0F" italics="true" pageId="0" pageNumber="357">Rockacestus blasi</emphasis>
</taxonomicName>
sp. nov. (holotype MACN-Pa No. 783) from
<taxonomicName id="A7DA691D1CA62C24ABCFFEEA624ADAFE" baseAuthorityName="Norman" baseAuthorityYear="1937" class="Chondrichthyes" family="Arhynchobatidae" genus="Bathyraja" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Bathyraja macloviana" order="Rajiformes" pageId="0" pageNumber="357" phylum="Chordata" rank="species" species="macloviana">
<emphasis id="937941E8722374A37597C09230D4DB59" italics="true" pageId="0" pageNumber="357">Bathyraja macloviana</emphasis>
</taxonomicName>
;
<emphasis id="17E081BD59BF8ECC6F3316691A3D76E1" bold="true" pageId="0" pageNumber="357">B.</emphasis>
<taxonomicName id="EBAD2F9806218B92FA3F8B6EB379BA70" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus magellanicus" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="magellanicus">
<emphasis id="EE2CAC7237B530308A5775BC5F5DD312" italics="true" pageId="0" pageNumber="357">Rockacestus magellanicus</emphasis>
</taxonomicName>
sp. nov. (holotype MACN-Pa No. 789) from
<taxonomicName id="1529CD5165CB466BD5A68D2A8724D595" baseAuthorityName="Philippi" baseAuthorityYear="1902" class="Chondrichthyes" family="Arhynchobatidae" genus="Bathyraja" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Bathyraja magellanica" order="Rajiformes" pageId="0" pageNumber="357" phylum="Chordata" rank="species" species="magellanica">
<emphasis id="F4BA78BB98128CAC89F5CD87E678C153" italics="true" pageId="0" pageNumber="357">Bathyraja magellanica</emphasis>
</taxonomicName>
;
<emphasis id="164C89648961442E4062395CC3586293" bold="true" pageId="0" pageNumber="357">C.</emphasis>
<taxonomicName id="1AA34B49E36425D88C145105992F5F19" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus ottavianoi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="ottavianoi">
<emphasis id="365EECBF4913C6BE38ACDE997F04ABF7" italics="true" pageId="0" pageNumber="357">Rockacestus ottavianoi</emphasis>
</taxonomicName>
sp. nov. (holotype MACN-Pa 793) from
<taxonomicName id="6A144640B1BB27E830618EE9EB31D632" baseAuthorityName="Philippi" baseAuthorityYear="1902" class="Chondrichthyes" family="Arhynchobatidae" genus="Bathyraja" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Bathyraja magellanica" order="Rajiformes" pageId="0" pageNumber="357" phylum="Chordata" rank="species" species="magellanica">
<emphasis id="247D52D286ED05F6769712BE0E3CB8CE" italics="true" pageId="0" pageNumber="357">Bathyraja magellanica</emphasis>
</taxonomicName>
.
</paragraph>
</caption>
<caption id="0BB51965A90BCEFCC52442DADBBBF445" doi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357" start="Figure 2" startId="F2">
<paragraph id="A5887252822A60FC608AFA0F54419DF1" pageId="0" pageNumber="357">
<emphasis id="865235F8B72E72D92E4DA5970515EDCF" bold="true" pageId="0" pageNumber="357">Figure 2.</emphasis>
Line drawings of
<taxonomicName id="083E56899C7028AA320D5532857A0966" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="2DB594DBD72FDE14B2754883E4ECB2D5" italics="true" pageId="0" pageNumber="357">Rockacestus blasi</emphasis>
</taxonomicName>
sp. nov. from
<taxonomicName id="F90A86DCAE37533A8A9610C8A8D6CBF8" baseAuthorityName="Norman" baseAuthorityYear="1937" class="Chondrichthyes" family="Arhynchobatidae" genus="Bathyraja" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Bathyraja macloviana" order="Rajiformes" pageId="0" pageNumber="357" phylum="Chordata" rank="species" species="macloviana">
<emphasis id="8280F8540CE74861CCFA3EC6F9F2EE4C" italics="true" pageId="0" pageNumber="357">Bathyraja macloviana</emphasis>
</taxonomicName>
.
<emphasis id="2E433BBD5DD51CB5F1A81C55393CA1AF" bold="true" pageId="0" pageNumber="357">A.</emphasis>
Scolex (holotype MACN-Pa No. 783);
<emphasis id="13E4637603C2CEBDF4158A252A6AA0C3" bold="true" pageId="0" pageNumber="357">B.</emphasis>
Terminal mature proglottid (holotype MACN-Pa No. 783);
<emphasis id="058E71C6138914156036E35E8F43BB33" bold="true" pageId="0" pageNumber="357">C.</emphasis>
Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783).
</paragraph>
</caption>
<caption id="6509D396BD8B17A3F7563ACA4282BFFF" doi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357" start="Figure 3" startId="F3">
<paragraph id="18F26E176381EFAEC4A37A8071291166" pageId="0" pageNumber="357">
<emphasis id="B3437AE35F18F489767C5D1CC30A25CE" bold="true" pageId="0" pageNumber="357">Figure 3.</emphasis>
<taxonomicName id="1AFD00732C73B73577C416116F37D3A1" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="C6818EBCB64FA248A1BDF9733C29C39B" italics="true" pageId="0" pageNumber="357">Rockacestus blasi</emphasis>
</taxonomicName>
sp. nov. from
<taxonomicName id="33A2AD07EC2E2C68CB3A91D55FBFB967" baseAuthorityName="Norman" baseAuthorityYear="1937" class="Chondrichthyes" family="Arhynchobatidae" genus="Bathyraja" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Bathyraja macloviana" order="Rajiformes" pageId="0" pageNumber="357" phylum="Chordata" rank="species" species="macloviana">
<emphasis id="7B3ADF3ED7FD474107DA222403326CA7" italics="true" pageId="0" pageNumber="357">Bathyraja macloviana</emphasis>
</taxonomicName>
, scanning electron micrographs.
<emphasis id="8A34AB3D2F27C86A34BD7EED245F5036" bold="true" pageId="0" pageNumber="357">A.</emphasis>
Scolex, small letters indicate the location of details shown in Fig.
<figureCitation id="121DF2109B9C8170DBCB700F8580140C" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3B</figureCitation>
,
<figureCitation id="6B59A543B35B59BA5A77E91B86D8FEA4" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3F-G</figureCitation>
,
<figureCitation id="0383ADBBC4383E74CB158BC21A260E10" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3I</figureCitation>
,
<figureCitation id="F5235A08F818CC8E60E0E9A6F7289850" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3K</figureCitation>
;
<emphasis id="50B688C1AFB463ACC7015081AFF3D7A9" bold="true" pageId="0" pageNumber="357">B.</emphasis>
Apical sucker, small letters indicate location of detail shown in Fig.
<figureCitation id="178F96EE13643F13A8D121C938F5611D" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3C-D</figureCitation>
;
<emphasis id="C1340EE15B97ECD2DCACD6498811EE3D" bold="true" pageId="0" pageNumber="357">C.</emphasis>
Distal surface of apical sucker, acicular filitriches and lingulate spinitriches;
<emphasis id="CF257E28100E8F8DC9D59C7F3F5DFBF7" bold="true" pageId="0" pageNumber="357">D.</emphasis>
Surface of the external apical sucker rim, lanceolate spinitriches;
<emphasis id="C6304B6DA1FCB3A06938D6B19163A02F" bold="true" pageId="0" pageNumber="357">E.</emphasis>
Detail of distal surface of the apical sucker, acicular filitriches;
<emphasis id="DFC7DF75528E248AB0199C07AE05A02B" bold="true" pageId="0" pageNumber="357">F.</emphasis>
Distal bothridial surface, lingulate spinitriches;
<emphasis id="E8F3F6964C9E1BDB4AF1C62310554236" bold="true" pageId="0" pageNumber="357">G.</emphasis>
Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches;
<emphasis id="0FE57A44357857094E0A0304F6F98CFD" bold="true" pageId="0" pageNumber="357">H.</emphasis>
Detail of distal surface of marginal loculi;
<emphasis id="D430D4A43DF91DE9E8A6D9292A09A778" bold="true" pageId="0" pageNumber="357">I.</emphasis>
Proximal bothridial surface, acicular filitriches;
<emphasis id="E9344A35EA8207B736AB8A42F260D484" bold="true" pageId="0" pageNumber="357">J.</emphasis>
Distal bothridial surface, detail of lingulate spinitriches;
<emphasis id="9D4F88065D7458E4043A46E8CFD91564" bold="true" pageId="0" pageNumber="357">K.</emphasis>
Scutes on surface of neck.
</paragraph>
</caption>
<paragraph id="43CA3F05ED27281DB59A34220D04D6CF" pageId="0" pageNumber="357">
Apex of scolex proper covered with acicular filitriches. Proximal bothridial surface covered with acicular filitriches (Fig.
<figureCitation id="32A7575633B015338D6359BBC8262C5A" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3I</figureCitation>
). Distal bothridial surface covered with acicular filitriches interspersed with lingulate spinitriches, lingulate spinitriches increasing in density posteriorly (Fig.
<figureCitation id="20BA00DA93CE40E339D1AEA56AB10645" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3F, J</figureCitation>
). Distal surface of apical sucker covered with acicular filitriches interspersed with lingulate spinitriches; posterior half of external rim of apical sucker with small lanceolate spinitriches (Fig.
<figureCitation id="13B6A83063D960A8E9A51EF4D17D7E0E" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3B-E</figureCitation>
). Distal surface of marginal loculi covered with papilliform to acicular filitriches interspersed with short coniform spinitriches (Fig.
<figureCitation id="991EA1F48C933E0C281195239964CE4F" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3G, H</figureCitation>
). Capilliform filitriches on neck and strobila arranged in scutes (Fig.
<figureCitation id="B83E2FF96F1DAD246678C6C01D19CAB7" captionStart="Figure 3" captionStartId="F3" captionText="Figure 3. Rockacestus blasi sp. nov. from Bathyraja macloviana, scanning electron micrographs. A. Scolex, small letters indicate the location of details shown in Fig. 3 B, 3 F-G, 3 I, 3 K; B. Apical sucker, small letters indicate location of detail shown in Fig. 3 C-D; C. Distal surface of apical sucker, acicular filitriches and lingulate spinitriches; D. Surface of the external apical sucker rim, lanceolate spinitriches; E. Detail of distal surface of the apical sucker, acicular filitriches; F. Distal bothridial surface, lingulate spinitriches; G. Distal surface of marginal loculi, acicular filitriches and short coniform spinitriches; H. Detail of distal surface of marginal loculi; I. Proximal bothridial surface, acicular filitriches; J. Distal bothridial surface, detail of lingulate spinitriches; K. Scutes on surface of neck." figureDoi="10.3897/zse.100.117956.figure3" httpUri="https://binary.pensoft.net/fig/1014941" pageId="0" pageNumber="357">3K</figureCitation>
). Cilia not observed.
</paragraph>
<paragraph id="E6955EC3529C0A386A0DC29DB252B545" pageId="0" pageNumber="357">
Specimens possessing mature proglottids with 133-202 (158
<normalizedToken id="8E1C0135CCF738C16500845520742545" originalValue="±">+/-</normalizedToken>
38, n = 3) immature proglottids and 2-7 (5
<normalizedToken id="F0800ED7D968C402B54D7EF980E9A36A" originalValue="±">+/-</normalizedToken>
3, n = 3) mature proglottid per worm. Mature proglottids becoming longer than wide posteriorly (Fig.
<figureCitation id="4B641B866F259AB7CAA6052E9DAA1DF7" captionStart="Figure 1" captionStartId="F1" captionText="Figure 1. Light micrographs of whole worms of Rockacestus from the Southwestern Atlantic Ocean. A. Rockacestus blasi sp. nov. (holotype MACN-Pa No. 783) from Bathyraja macloviana; B. Rockacestus magellanicus sp. nov. (holotype MACN-Pa No. 789) from Bathyraja magellanica; C. Rockacestus ottavianoi sp. nov. (holotype MACN-Pa 793) from Bathyraja magellanica." figureDoi="10.3897/zse.100.117956.figure1" httpUri="https://binary.pensoft.net/fig/1014939" pageId="0" pageNumber="357">1A</figureCitation>
). Terminal mature proglottid, 940-1,360 (1,180
<normalizedToken id="7BF0A422A1520343B6B654547E4EF3C0" originalValue="±">+/-</normalizedToken>
216, n = 3) long, 600-800 (727
<normalizedToken id="06D35A167F5580A459411558F905D0C5" originalValue="±">+/-</normalizedToken>
110, n = 3) wide, length-to-width ratio, 1.6-1.7 (1.6
<normalizedToken id="E616354F399D7D87575DB74BDF36D0AC" originalValue="±">+/-</normalizedToken>
0.1): 1. Specimens possessing gravid proglottids with 99-146 (120
<normalizedToken id="899CA210A9740549382973E1DCC5135A" originalValue="±">+/-</normalizedToken>
17, n = 14) immature proglottids, 4-8 (7
<normalizedToken id="ACF33DCD70B430115DBF27243E32C870" originalValue="±">+/-</normalizedToken>
1.5, n = 14) mature proglottids, and 1-2 (1
<normalizedToken id="9BA2EA57237AD3B9EB9487581A7E7874" originalValue="±">+/-</normalizedToken>
0.4, n = 14) gravid proglottids per worm. Gravid proglottids longer than wide. Terminal gravid proglottid, 1,180-1,820 (1,591
<normalizedToken id="CBC74904E1F7ECF60839997381728C7A" originalValue="±">+/-</normalizedToken>
203, n = 14) long, 620-970 (783
<normalizedToken id="FCF666845B315F395CF1D2E1FCDEE7CC" originalValue="±">+/-</normalizedToken>
97, n = 14) wide, length-to-width ratio, 1.4-2.9 (2.1
<normalizedToken id="1C691230971345F6BD06EF902CA88769" originalValue="±">+/-</normalizedToken>
0.4): 1 (Fig.
<figureCitation id="CA3ACD5FE90AC1F24F3A25B705BF129F" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2B</figureCitation>
).
</paragraph>
<paragraph id="9FBCAEA4B4B0D6513BE2055DE77E4493" pageId="0" pageNumber="357">
Testes spherical to slightly oblong, 75-96 (86
<normalizedToken id="6B0D160AB32AF6488DCEA193A6CC0377" originalValue="±">+/-</normalizedToken>
9, n = 4) in total number, 55-88 (78
<normalizedToken id="C4F846C1F2DAFC1DDFB3E5D78DA67EEC" originalValue="±">+/-</normalizedToken>
10, n = 17) long, 54-93 (77
<normalizedToken id="75462D6320FFD26127CCF7A680150A08" originalValue="±">+/-</normalizedToken>
10, n = 17) wide, extending from anterior margin of proglottid to anterior quarter of the ovary; arranged in 6-8 columns anteroposteriorly and 3-4 layers deep in cross-section observed in anterior portion of proglottid (Figs
<figureCitation id="D7061D66687187F39463C759AEAAF268" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2B</figureCitation>
,
<figureCitation id="814A1C8E773C35E9ED8BBFCA9EF453E8" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Light micrographs of cross-sections of mature proglottids of species of Rockacestus off Argentina. A-C. Rockacestus blasi sp. nov.; A. At the level of the testes, anterior to the cirrus sac; B. At the level of the cirrus sac; C. At the level of ovarian isthmus; D-F. Rockacestus magellanicus sp. nov.; D. At the level of the testes, anterior to the cirrus sac; E. At the level of the cirrus sac; F. At the level of ovarian isthmus; G-I. Rockacestus ottavianoi sp. nov; G. At the level of the testes, anterior to the cirrus sac; H. At the level of the cirrus sac; I. At the level of ovarian isthmus; cs - cirrus sac; oc - ovicapt; ov - ovary; sr - seminal receptacle; t - testes; u - uterus; ut - uteroduct; vd - vas deferens; vf - vitelline follicle; vg - vagina; vod - ventral osmoregulatory duct." figureDoi="10.3897/zse.100.117956.figure7" httpUri="https://binary.pensoft.net/fig/1014945" pageId="0" pageNumber="357">7A</figureCitation>
). Postvaginal testes present. Cirrus sac oval, curved anteriorly, 276-450 (379
<normalizedToken id="B480DE9D4631D1DE30C7930DA062BC71" originalValue="±">+/-</normalizedToken>
42, n = 16) long, 115-175 (148
<normalizedToken id="CAF06DA7242DD6B9293C744B6FF4D400" originalValue="±">+/-</normalizedToken>
19, n = 16) wide. Cirrus coiled, armed with minute spinitriches. Vas deferens highly coiled, anterior and adjacent to medial margin of cirrus sac, entering cirrus sac through anterior margin (Figs
<figureCitation id="64AF493B2BF3437AA6E6F4EFAB50FEF8" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2B, C</figureCitation>
,
<figureCitation id="CA779A3602C27B324DA4C4C6B2473C23" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Light micrographs of cross-sections of mature proglottids of species of Rockacestus off Argentina. A-C. Rockacestus blasi sp. nov.; A. At the level of the testes, anterior to the cirrus sac; B. At the level of the cirrus sac; C. At the level of ovarian isthmus; D-F. Rockacestus magellanicus sp. nov.; D. At the level of the testes, anterior to the cirrus sac; E. At the level of the cirrus sac; F. At the level of ovarian isthmus; G-I. Rockacestus ottavianoi sp. nov; G. At the level of the testes, anterior to the cirrus sac; H. At the level of the cirrus sac; I. At the level of ovarian isthmus; cs - cirrus sac; oc - ovicapt; ov - ovary; sr - seminal receptacle; t - testes; u - uterus; ut - uteroduct; vd - vas deferens; vf - vitelline follicle; vg - vagina; vod - ventral osmoregulatory duct." figureDoi="10.3897/zse.100.117956.figure7" httpUri="https://binary.pensoft.net/fig/1014945" pageId="0" pageNumber="357">7B</figureCitation>
).
</paragraph>
<paragraph id="2FF859AEAAE3D19878A6BF50577F89EF" pageId="0" pageNumber="357">
Ovary lobulated, H-shaped in frontal view, X-shaped in cross-section at level of isthmus, 230-580 (350
<normalizedToken id="D3984B47BC1268C1ACA2C8E9273DF593" originalValue="±">+/-</normalizedToken>
79, n = 17) long, 250-610 (456
<normalizedToken id="47B5CB84627CC70C437F95240268457C" originalValue="±">+/-</normalizedToken>
83, n = 17) wide (Figs
<figureCitation id="E0FAEB87108B65D0A509CC0ADBB09E43" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2B</figureCitation>
,
<figureCitation id="ED701D034C03728D79B83F4565C20D78" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Light micrographs of cross-sections of mature proglottids of species of Rockacestus off Argentina. A-C. Rockacestus blasi sp. nov.; A. At the level of the testes, anterior to the cirrus sac; B. At the level of the cirrus sac; C. At the level of ovarian isthmus; D-F. Rockacestus magellanicus sp. nov.; D. At the level of the testes, anterior to the cirrus sac; E. At the level of the cirrus sac; F. At the level of ovarian isthmus; G-I. Rockacestus ottavianoi sp. nov; G. At the level of the testes, anterior to the cirrus sac; H. At the level of the cirrus sac; I. At the level of ovarian isthmus; cs - cirrus sac; oc - ovicapt; ov - ovary; sr - seminal receptacle; t - testes; u - uterus; ut - uteroduct; vd - vas deferens; vf - vitelline follicle; vg - vagina; vod - ventral osmoregulatory duct." figureDoi="10.3897/zse.100.117956.figure7" httpUri="https://binary.pensoft.net/fig/1014945" pageId="0" pageNumber="357">7C</figureCitation>
). Vagina thick-walled, extending anteriorly from ootype region forming a seminal receptacle, then running laterally along vas deferens bulk to anterior quarter of proglottid, recurving posteriorly to enter genital atrium anterior to cirrus sac (Figs
<figureCitation id="7FB6EC783814FE125FCA9A7928D55EDD" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2B, C</figureCitation>
,
<figureCitation id="53AFF260BF547C228CBC50BEB459BECC" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Light micrographs of cross-sections of mature proglottids of species of Rockacestus off Argentina. A-C. Rockacestus blasi sp. nov.; A. At the level of the testes, anterior to the cirrus sac; B. At the level of the cirrus sac; C. At the level of ovarian isthmus; D-F. Rockacestus magellanicus sp. nov.; D. At the level of the testes, anterior to the cirrus sac; E. At the level of the cirrus sac; F. At the level of ovarian isthmus; G-I. Rockacestus ottavianoi sp. nov; G. At the level of the testes, anterior to the cirrus sac; H. At the level of the cirrus sac; I. At the level of ovarian isthmus; cs - cirrus sac; oc - ovicapt; ov - ovary; sr - seminal receptacle; t - testes; u - uterus; ut - uteroduct; vd - vas deferens; vf - vitelline follicle; vg - vagina; vod - ventral osmoregulatory duct." figureDoi="10.3897/zse.100.117956.figure7" httpUri="https://binary.pensoft.net/fig/1014945" pageId="0" pageNumber="357">7C</figureCitation>
). Vagina and cirrus open into a small common genital atrium, 40-85 (66
<normalizedToken id="CDE9FEEC89A213851E92E6BDB4AD6D4C" originalValue="±">+/-</normalizedToken>
14, n = 16) deep. Genital pores alternate irregularly, 54-73% (61
<normalizedToken id="4389069A7703FF66C00C0C64D563CD2B" originalValue="±">+/-</normalizedToken>
5, n = 17) of proglottid length from posterior margin of proglottid. Vitellarium follicular, follicles irregular in shape, 31-52 (41
<normalizedToken id="99B10C4E8F59C5D2DD16EF49A32C06EC" originalValue="±">+/-</normalizedToken>
9, n = 17) long, 50-80 (70
<normalizedToken id="EB021242C0BAF5F301361A90EACBC989" originalValue="±">+/-</normalizedToken>
10, n = 17) wide, arranged in 2 lateral bands almost reaching midline in anterior third of proglottid, each band consisting of multiple columns (5 columns of follicles anterior to cirrus sac), extending throughout the length of proglottid, uninterrupted by ovary, partially interrupted by genital atrium (Figs
<figureCitation id="F28CD70CA505412C72C80EFD8490AE9B" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2B</figureCitation>
,
<figureCitation id="61FD8A9EAB799A060AEFB59B9B0D0AF9" captionStart="Figure 7" captionStartId="F7" captionText="Figure 7. Light micrographs of cross-sections of mature proglottids of species of Rockacestus off Argentina. A-C. Rockacestus blasi sp. nov.; A. At the level of the testes, anterior to the cirrus sac; B. At the level of the cirrus sac; C. At the level of ovarian isthmus; D-F. Rockacestus magellanicus sp. nov.; D. At the level of the testes, anterior to the cirrus sac; E. At the level of the cirrus sac; F. At the level of ovarian isthmus; G-I. Rockacestus ottavianoi sp. nov; G. At the level of the testes, anterior to the cirrus sac; H. At the level of the cirrus sac; I. At the level of ovarian isthmus; cs - cirrus sac; oc - ovicapt; ov - ovary; sr - seminal receptacle; t - testes; u - uterus; ut - uteroduct; vd - vas deferens; vf - vitelline follicle; vg - vagina; vod - ventral osmoregulatory duct." figureDoi="10.3897/zse.100.117956.figure7" httpUri="https://binary.pensoft.net/fig/1014945" pageId="0" pageNumber="357">7A-C</figureCitation>
). Uterus saccate, restricted to region between ovary and cirrus sac, running anteriorly up to genital pore level; uterine duct not observed (Fig.
<figureCitation id="291F473A7F4498009378678A800F818E" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2B</figureCitation>
).
<normalizedToken id="223CE09CD8438A68645BF2AD388A43D1" originalValue="Mehlis´">Mehlis'</normalizedToken>
gland, 80-115 (101
<normalizedToken id="A52570A83DA10FD2F39B1CE6BC4BED55" originalValue="±">+/-</normalizedToken>
8, n = 15) long, 60-110 (94
<normalizedToken id="BA4A5825A45028D7C3E91D83718964EB" originalValue="±">+/-</normalizedToken>
13, n = 15) wide, posterior to the ovarian isthmus (Fig.
<figureCitation id="E872BF7DBBAE25362CEED1298ED416F1" captionStart="Figure 2" captionStartId="F2" captionText="Figure 2. Line drawings of Rockacestus blasi sp. nov. from Bathyraja macloviana. A. Scolex (holotype MACN-Pa No. 783); B. Terminal mature proglottid (holotype MACN-Pa No. 783); C. Detail of terminal genitalia, terminal mature proglottid (holotype MACN-Pa No. 783)." figureDoi="10.3897/zse.100.117956.figure2" httpUri="https://binary.pensoft.net/fig/1014940" pageId="0" pageNumber="357">2B</figureCitation>
).
</paragraph>
<paragraph id="458F3DAFB215C15A36E90F48D83BAE3C" pageId="0" pageNumber="357">
Detached gravid proglottids, 2,300-2,525 (2,392
<normalizedToken id="CBAEE161BF7C91ED0550C1672E01FC58" originalValue="±">+/-</normalizedToken>
118, n = 3) long, 725-775 (758
<normalizedToken id="3B6BAEF5EABAE3B71483FE1A32CC28F9" originalValue="±">+/-</normalizedToken>
29, n = 3) wide, length-to-width ratio, 3.0-3.3 (3.2
<normalizedToken id="3AC5044D0724B6D577BC9183BCF97968" originalValue="±">+/-</normalizedToken>
0.1): 1.
</paragraph>
</subSubSection>
<subSubSection id="968BE23F5B555B616D2F6D3A384B9BDC" pageId="0" pageNumber="357" type="host">
<paragraph id="8C24A27CFF4E18C38CF186DD74822D6D" pageId="0" pageNumber="357">Host.</paragraph>
<paragraph id="153022A2AC197F55B92E39E35A00B8A8" pageId="0" pageNumber="357">
<taxonomicName id="F130EF4683992B6E864CF8DD239591E4" baseAuthorityName="Norman" baseAuthorityYear="1937" class="Chondrichthyes" family="Arhynchobatidae" genus="Bathyraja" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Bathyraja macloviana" order="Rajiformes" pageId="0" pageNumber="357" phylum="Chordata" rank="species" species="macloviana">
<emphasis id="D8F008A38BA162C8EC9437E1DBE833C7" italics="true" pageId="0" pageNumber="357">Bathyraja macloviana</emphasis>
</taxonomicName>
(Norman, 1937), Patagonian skate (
<taxonomicName id="BFE21F5A23FEE665737DA3D468FA69BD" class="Chondrichthyes" higherTaxonomySource="GBIF" kingdom="Animalia" lsidName="" order="Rajiformes" pageId="0" pageNumber="357" phylum="Chordata" rank="order">Rajiformes</taxonomicName>
,
<taxonomicName id="23258D27396F2629F1281D86D51030F5" class="Elasmobranchii" family="Arhynchobatidae" kingdom="Animalia" lsidName="" order="Rajiformes" pageId="0" pageNumber="357" phylum="Chordata" rank="family">Arhynchobatidae</taxonomicName>
) (type host). Prevalence of infection, 83% in
<taxonomicName id="78747B3DC49D1EBCE613FF3537CD911B" lsidName="B. macloviana" pageId="0" pageNumber="357" rank="species" species="macloviana">
<emphasis id="83C9542658EBB415E673F3060F95E616" italics="true" pageId="0" pageNumber="357">B. macloviana</emphasis>
</taxonomicName>
(5 hosts infected out of 6 examined).
</paragraph>
</subSubSection>
<subSubSection id="C32749DF458E5E23FEE9A7F64E3EB2CC" pageId="0" pageNumber="357" type="etymology">
<paragraph id="F5192AC750593C89B06B318B709092FE" pageId="0" pageNumber="357">Etymology.</paragraph>
<paragraph id="E49F07FA0266C7B785850EDE2A7A8ADE" pageId="0" pageNumber="357">
This species is named in memory of the first
<normalizedToken id="F7530E54817E78656B43D0D5DC25E092" originalValue="authors">author's</normalizedToken>
father, Blas
<normalizedToken id="7D28D1F0936C32A02126C46F867C1EAD" originalValue="García">Garcia</normalizedToken>
Mallarine for his invaluable love, support, and encouragement over the years.
</paragraph>
</subSubSection>
<subSubSection id="235DC5C0F9279D454E2FBF8414FA062A" pageId="0" pageNumber="357" type="distribution">
<paragraph id="8D83D281196BC5B1057C8E7F9E710777" pageId="0" pageNumber="357">Distribution.</paragraph>
<paragraph id="3936F9B00DE69E877B91F8282DC04E10" pageId="0" pageNumber="357">
This species is widespread along the continental shelf of Argentina occurring from waters off Buenos Aires Province to southeast Patagonia including the Marine Protected Area
<normalizedToken id="E021B82956ECC947FEDFE4B27B2AD0F2" originalValue="Namuncurá">Namuncura</normalizedToken>
/Burdwood Bank, Argentina (Fig.
<figureCitation id="3EA261139EF2CC8C35F958C199ABC9C7" captionStart="Figure 9" captionStartId="F9" captionText="Figure 9. Geographic distribution of the valid species of Rockacestus from the Southern Hemisphere. Symbols: red dot: new records; blue dot: previous records; Rar - Rockacestus arctowskii; Rbl - Rockacestus blasi sp. nov.; Rca - Rockacestus carvajali; Rco - Rockacestus conchai; Rge - Rockacestus georgiensis; Rma - Rockacestus magellanicus sp. nov.; Rot - Rockacestus ottavianoi sp. nov.; Rra - Rockacestus rakusai; Rsi - Rockacestus siedleckii." figureDoi="10.3897/zse.100.117956.figure9" httpUri="https://binary.pensoft.net/fig/1014947" pageId="0" pageNumber="357">9</figureCitation>
).
</paragraph>
</subSubSection>
<subSubSection id="0400E88F55FB8FDD3E773BEED49E23CD" pageId="0" pageNumber="357" type="remarks">
<paragraph id="FC5246D1F45C602CCF82AB98D63A33D6" pageId="0" pageNumber="357">Remarks.</paragraph>
<paragraph id="32B9677DC29A8B9CAD1A6B00DD361130" pageId="0" pageNumber="357">
Specimens of
<taxonomicName id="7F7C986A19CF417AB5A812B0CF4E5F81" class="Cestoda" kingdom="Animalia" lsidName="R. blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="8F86C1BFA23EAEDA7F9920FF1D6E0F88" italics="true" pageId="0" pageNumber="357">R. blasi</emphasis>
</taxonomicName>
sp. nov. can easily be distinguished from five valid species in the genus by the total length.
<taxonomicName id="6808F8F3D0E6A01A2575E9E4CC0D0AD2" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="6ACE3CED0B122FE2099F1A78D69F5621" italics="true" pageId="0" pageNumber="357">Rockacestus blasi</emphasis>
</taxonomicName>
sp. nov. is longer than
<taxonomicName id="09D7BE785F933421418E737EEA1E6631" class="Cestoda" kingdom="Animalia" lsidName="R. carvajali" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="carvajali">
<emphasis id="1F18B0C90C5F4B2F02B627F05289988C" italics="true" pageId="0" pageNumber="357">R. carvajali</emphasis>
</taxonomicName>
and
<taxonomicName id="ECBF5F5714F63595F1E512D2E5609743" class="Cestoda" kingdom="Animalia" lsidName="R. conchai" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="conchai">
<emphasis id="D484F5DFAAB8DF827C021B504607D8CC" italics="true" pageId="0" pageNumber="357">R. conchai</emphasis>
</taxonomicName>
(22.3-50.9 mm vs. 13.1-14.5 mm and 9.9-16.9 mm, respectively), and is shorter than
<taxonomicName id="B2E89E5FA2B1224B31FA6B0F8FA83035" class="Cestoda" kingdom="Animalia" lsidName="R. brittanicus" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="brittanicus">
<emphasis id="281E473A9ECFB8CA112C3DE7DD9B96FD" italics="true" pageId="0" pageNumber="357">R. brittanicus</emphasis>
</taxonomicName>
,
<taxonomicName id="9470EE3279A455185D2856CAFF1BC80E" class="Cestoda" kingdom="Animalia" lsidName="R. georgiensis" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="georgiensis">
<emphasis id="C44B6386FCEE7B125D6B21AE2285396C" italics="true" pageId="0" pageNumber="357">R. georgiensis</emphasis>
</taxonomicName>
and
<taxonomicName id="F81C2DA70BA81E0767EAC879F1862404" class="Cestoda" kingdom="Animalia" lsidName="R. williamsi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="williamsi">
<emphasis id="762EE7382171EE73BD8D3B88F4E3E5A3" italics="true" pageId="0" pageNumber="357">R. williamsi</emphasis>
</taxonomicName>
(22.3-50.9 mm vs. 170-250 mm, 60-170 mm, and 90 mm, respectively).
<taxonomicName id="A8FA3D2B7249DB87862813F7E4BC71C7" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="40175FA9623F2C09DF02C6851AC84A80" italics="true" pageId="0" pageNumber="357">Rockacestus blasi</emphasis>
</taxonomicName>
sp. nov. differs from
<taxonomicName id="2912ED27FA8094A0BE83210863EB12D9" class="Cestoda" kingdom="Animalia" lsidName="R. piriei" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="piriei">
<emphasis id="E8E8973905452BE49BE67024E454DB41" italics="true" pageId="0" pageNumber="357">R. piriei</emphasis>
</taxonomicName>
,
<taxonomicName id="A10DC55D15699422EA9806D809FA78DD" class="Cestoda" kingdom="Animalia" lsidName="R. radioductus" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="radioductus">
<emphasis id="88849A76FBF133F6A40D4D97E4D3FB9D" italics="true" pageId="0" pageNumber="357">R. radioductus</emphasis>
</taxonomicName>
, and
<taxonomicName id="ECDE254D2E0384DCA452907FB8E192ED" class="Cestoda" kingdom="Animalia" lsidName="R. rakusai" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="rakusai">
<emphasis id="9136F639E3AAA80D730799FE40D19CD1" italics="true" pageId="0" pageNumber="357">R. rakusai</emphasis>
</taxonomicName>
in possessing fewer testes (75-96 vs. 137-165, ≥100, and 120-165, respectively).
<taxonomicName id="456F3D95E3E88EC7A02F2A8386054BE4" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="D61BAECACB49BABC1333BDB21139CBB3" italics="true" pageId="0" pageNumber="357">Rockacestus blasi</emphasis>
</taxonomicName>
sp. nov. can also be distinguished from
<taxonomicName id="074762552B04F53EF48DB958DB8E99BA" class="Cestoda" kingdom="Animalia" lsidName="R. radioductus" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="radioductus">
<emphasis id="0E8F70013D997F532DBE1E835B6EAFC5" italics="true" pageId="0" pageNumber="357">R. radioductus</emphasis>
</taxonomicName>
in the distribution of testes (arranged in 6-8 columns in anteroposterior view vs. more than 15), the distribution of the vitelline follicles in the anterior third of the proglottid (reaching almost the midline of the proglottid vs. restricted to lateral bands), and in the position of the genital pore (54-73% from the posterior margin of the proglottid vs. equidistant from the anterior and posterior margin of the proglottid).
<taxonomicName id="16373690D053B62DCDEFD8E34EC79DCD" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="5692766A10C9DCCFE7B938F61E617B47" italics="true" pageId="0" pageNumber="357">Rockacestus blasi</emphasis>
</taxonomicName>
sp. nov. can be distinguished from
<taxonomicName id="5E05308FE398AA46104D0500AB71563A" class="Cestoda" kingdom="Animalia" lsidName="R. arctowskii" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="arctowskii">
<emphasis id="2C35B1637AEBE1CE0C18828FF4B0CC48" italics="true" pageId="0" pageNumber="357">R. arctowskii</emphasis>
</taxonomicName>
by the number of proglottids (140-204 vs. 24-98, respectively).
<taxonomicName id="F012F741861AA62C655C2AFCB422602B" authorityName="García Facal &amp; Ivanov &amp; Menoret" authorityYear="2024" class="Cestoda" family="Phyllobothriidae" genus="Rockacestus" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Rockacestus blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="6A069E44EB6DF97B02C4950ECBBFFEB8" italics="true" pageId="0" pageNumber="357">Rockacestus blasi</emphasis>
</taxonomicName>
sp. nov. is different than
<taxonomicName id="3E06189E9E5B1CAF37D7241E17A04B29" class="Cestoda" kingdom="Animalia" lsidName="R. siedleckii" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="siedleckii">
<emphasis id="BE765C7B2995818A14A122B02FCEEF7C" italics="true" pageId="0" pageNumber="357">R. siedleckii</emphasis>
</taxonomicName>
in the length of the scolex (400-830 vs. 840-960, respectively) and in the size of the apical sucker (80-135 vs. 185-220, respectively). Finally,
<taxonomicName id="F17D990AF0D4C1F51BC799261B34FD70" class="Cestoda" kingdom="Animalia" lsidName="R. blasi" order="Phyllobothriidea" pageId="0" pageNumber="357" phylum="Platyhelminthes" rank="species" species="blasi">
<emphasis id="20437AB237F4411E7C983374AD1BB07E" italics="true" pageId="0" pageNumber="357">R. blasi</emphasis>
</taxonomicName>
sp. nov. can be distinguished from 9 members in the genus by being apolytic instead of euapolytic.
</paragraph>
</subSubSection>
</treatment>
</document>