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<mods:title id="2793F85F58B7167FB725E9B36D12F2E7">Redescription and phylogenetic assessment of Helicometra antarcticae Holloway &amp; Bier, 1968 (Trematoda, Opecoelidae), with evidence of non-monophyletic status of the genus Helicometra Odhner, 1902</mods:title>
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<mods:affiliation id="FDAEB9ECC3F801904D2F3104F9F3CD71">Centre of Parasitology, A. N. Severtsov Institute of Ecology and Evolution, Moscow, Leninskiy Av. 33, 119071 (Russia) sokolovsg @ mail. ru</mods:affiliation>
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<mods:affiliation id="71934F0EB83687A869553C3470564CD6">Department of Invertebrate Zoology, St. Petersburg State University, St. Petersburg, Universitetskaya nab., 7 / 9, 199034 (Russia) svshchenkov @ yandex. ru</mods:affiliation>
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<mods:namePart id="13C38DB2441FEC5A2D5210BFEA2F1720">Khasanov, Fuat K.</mods:namePart>
<mods:affiliation id="8EE564B2719792602F7090C1B33AF385">Centre of Parasitology, A. N. Severtsov Institute of Ecology and Evolution, Moscow, Leninskiy Av. 33, 119071 (Russia) fuatka @ mail. ru</mods:affiliation>
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<mods:affiliation id="1C3B36E879263F6CFC362E1B771B6D90">A. O. Kovalevsky Institute of Biology of the Southern Seas, Sevastopol, Nakhimov Ave., 2, 299011 (Russia) miju 2811 @ mail. ru</mods:affiliation>
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<mods:affiliation id="750EFB96E9C769DB053E7D3EA1801363">Department of Pacific Salmon, Russian Federal Research Institute of Fisheries and Oceanography, Moscow, Okruzhnoy Proyezd 19, 105187 (Russia) and Department of Invertebrate Zoology, Lomonosov Moscow State University, Moscow, Leninskiye Gory 1 / 12, 119234 (Russia) gordeev _ ilya @ bk. ru (corresponding author)</mods:affiliation>
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<taxonomicName id="9DFC4D0AFFCECD7F529E8BE8FD02FB68" ID-CoL="6LJ9W" authority="Holloway &amp; Bier, 1968" authorityName="Holloway &amp; Bier" authorityYear="1968" box="[193,714,1203,1230]" class="Trematoda" family="Opecoelidae" genus="Helicometra" kingdom="Animalia" order="Plagiorchiida" pageId="5" pageNumber="426" phylum="Platyhelminthes" rank="species" species="antarcticae">
<emphasis id="6888EA9BFFCECD7F529E8BE8FE0DFB68" bold="true" box="[193,453,1203,1230]" italics="true" pageId="5" pageNumber="426">Helicometra antarcticae</emphasis>
<bibRefCitation id="3E6D4B78FFCECD7F53938BEFFD02FB68" author="Holloway &amp; Bier" box="[460,714,1204,1230]" firstAuthor="Holloway" pageId="5" pageNumber="426" pagination="30 - 34" refId="ref7924" refString="HOLLOWAY H. L. &amp; BIER J. W. 1968. - Helicometra antarcticae sp. nov. from Antarctic coastal fishes. Proceedings of the Helminthological Society of Washington 35: 30 - 34." type="journal article" year="1968">Holloway &amp; Bier, 1968</bibRefCitation>
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(
<figureCitation id="C2C72A0CFFCECD7F53FA8B8FFE2AFB48" box="[421,482,1236,1262]" captionStart="FIG" captionStartId="6.[132,143,1448,1466]" captionTargetBox="[164,1417,219,1391]" captionTargetId="figure-334@6.[144,1429,203,1412]" captionTargetPageId="6" captionText="FIG. 1. — Helicometra antarcticae Holloway &amp; Bier,1968 from intestine of the Antarctic toothfish,Dissostichus mawsoni Norman,1937, Ross Sea:A, whole mount, ventral view; B, terminal genitalia, lateral view; C, ovarian complex, ventral view. Abbreviations: С, cirrus everted through genital atrium; ej, ejaculatory duct; ga, genital atrium; isv, internal seminal vesicle; lc, Laurers canal; mg, Mehlis gland cells; mt, metraterm; oc, ovicapt; oo, oÖtype; ov, ovary; pc, prostatic cells; pp, pars prostatica; sr, seminal receptacle; vr, common vitelline reservoir. Scale bars: A, 1 mm; B, 0.2 mm; C, 0.08 mm." figureDoi="http://doi.org/10.5281/zenodo.7076019" httpUri="https://zenodo.org/record/7076019/files/figure.png" pageId="5" pageNumber="426">Fig. 1</figureCitation>
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<emphasis id="6888EA9BFFCECD7F52DB8A56FE9BFA82" box="[132,339,1293,1317]" italics="true" pageId="5" pageNumber="426">Helicometra antarcticae</emphasis>
<bibRefCitation id="3E6D4B78FFCECD7F53088A56FD98FA83" author="Holloway &amp; Bier" box="[343,592,1293,1317]" firstAuthor="Holloway" page="31" pageId="5" pageNumber="426" pagination="30 - 34" refId="ref7924" refString="HOLLOWAY H. L. &amp; BIER J. W. 1968. - Helicometra antarcticae sp. nov. from Antarctic coastal fishes. Proceedings of the Helminthological Society of Washington 35: 30 - 34." type="journal article" year="1968">Holloway &amp; Bier, 1968: 31</bibRefCitation>
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. —
<treatmentCitation id="DB5D1098FFCECD7F502B8A56FCCDFA83" author="BRAY R. A." box="[628,773,1293,1317]" page="402" pageId="5" pageNumber="426" year="1979">
<bibRefCitation id="3E6D4B78FFCECD7F502B8A56FCCDFA83" author="Bray" box="[628,773,1293,1317]" firstAuthor="Bray" page="402" pageId="5" pageNumber="426" pagination="399 - 431" refId="ref7491" refString="BRAY R. A. 1979. - Digenea in marine fishes from the eastern seaboard of Canada. Journal of Natural History 13: 399 - 431. https: // doi. org / 10.1080 / 00222937900770331" type="journal article" year="1979">Bray 1979: 402</bibRefCitation>
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<taxonomicName id="9DFC4D0AFFCECD7F52DD8A67FEB6FAF2" ID-CoL="46J5F" authorityName="Sekerak &amp; Arai" authorityYear="1974" baseAuthorityName="Holloway &amp; Bier" baseAuthorityYear="1968" box="[130,382,1340,1364]" class="Trematoda" family="Opecoelidae" genus="Neohelicometra" kingdom="Animalia" order="Plagiorchiida" pageId="5" pageNumber="426" phylum="Platyhelminthes" rank="species" species="antarcticae">
<emphasis id="6888EA9BFFCECD7F52DD8A67FEB6FAF2" box="[130,382,1340,1364]" italics="true" pageId="5" pageNumber="426">Neohelicometra antarcticae</emphasis>
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<treatmentCitation id="DB5D1098FFCECD7F53C88A67FD54FAF2" author="SEKERAK A. D. &amp; ARAI H. P." box="[407,668,1340,1364]" page="730" pageId="5" pageNumber="426" year="1974">
<bibRefCitation id="3E6D4B78FFCECD7F53C88A67FD54FAF2" author="Sekerak &amp; Arai" box="[407,668,1340,1364]" firstAuthor="Sekerak" page="730" pageId="5" pageNumber="426" pagination="707 - 738" refId="ref9150" refString="SEKERAK A. D. &amp; ARAI H. P. 1974. - A revision of Helicometra Odhner, 1902 and related genera (Trematoda: Opecoelidae), including a description of Neohelicometra sebastis n. sp. Canadian Journal of Zoology 52: 707 - 738. https: // doi. org / 10.1139 / z 74 - 095" type="journal article" year="1974">Sekerak &amp; Arai 1974: 730</bibRefCitation>
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<paragraph id="5A433689FFCECD7F52DB8A37FE56FA22" blockId="5.[132,414,1388,1412]" box="[132,414,1388,1412]" pageId="5" pageNumber="426">TYPE LOCALITY. — Ross Sea.</paragraph>
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TYPE MATERIAL. —
<emphasis id="6888EA9BFFCECD7F531B8AC7FE6BFA12" bold="true" box="[324,419,1436,1460]" pageId="5" pageNumber="426">
<typeStatus id="8547882BFFCECD7F531B8AC7FE6BFA12" box="[324,419,1436,1460]" pageId="5" pageNumber="426" type="holotype">Holotype</typeStatus>
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• Ross Sea, McMurdo Sound; intestine of the Antactic toothfish
<taxonomicName id="9DFC4D0AFFCECD7F53EC8AEDFDB7FA68" authorityName="Norman" authorityYear="1937" box="[435,639,1462,1486]" class="Actinopterygii" family="Nototheniidae" genus="Dissostichus" kingdom="Animalia" order="Perciformes" pageId="5" pageNumber="426" phylum="Chordata" rank="species" species="mawsoni">
<emphasis id="6888EA9BFFCECD7F53EC8AEDFDB7FA68" box="[435,639,1462,1486]" italics="true" pageId="5" pageNumber="426">Dissostichus mawsoni</emphasis>
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;
<date id="2E421049FFCECD7F50D28AEDFCCBFA68" box="[653,771,1462,1486]" pageId="5" pageNumber="426" value="1964-11-11">
<collectingDate id="3E06E9A1FFCECD7F50D28AEDFCCBFA68" box="[653,771,1462,1486]" pageId="5" pageNumber="426" value="1964-11-11">11.XI.1964</collectingDate>
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;
<specimenCode id="0A5A9EF2FFCECD7F52D98A8BFEFCFA4E" box="[134,308,1488,1512]" collectionCode="USNPC" country="USA" httpUri="http://grbio.org/cool/ppqr-es1r" name="United States National Parasite Collection" pageId="5" pageNumber="426" type="Museum">USNPC1358823</specimenCode>
.
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<materialsCitation id="EA943CD4FFCECD7F52DB8AB0FD43F9BB" ID-GBIF-Occurrence="3901378301" collectingDate="1964-11-25" collectionCode="USNPC" pageId="5" pageNumber="426" specimenCode="USNPC 1358824" specimenCount="1" typeStatus="paratype">
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<typeStatus id="8547882BFFCECD7F52DB8AB0FF13F9A5" box="[132,219,1515,1539]" pageId="5" pageNumber="426" type="paratype">Paratype</typeStatus>
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• Ross Sea, McMurdo Sound; intestine of zoarcid eelpout
<taxonomicName id="9DFC4D0AFFCECD7F52DB895EFE83F9BB" authorityName="DeWitt" authorityYear="1962" box="[132,331,1541,1565]" class="Actinopterygii" family="Zoarcidae" genus="Rhigophila" kingdom="Animalia" order="Perciformes" pageId="5" pageNumber="426" phylum="Chordata" rank="species" species="dearborni">
<emphasis id="6888EA9BFFCECD7F52DB895EFE83F9BB" box="[132,331,1541,1565]" italics="true" pageId="5" pageNumber="426">Rhigophila dearborni</emphasis>
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;
<date id="2E421049FFCECD7F5307895EFE04F9BB" box="[344,460,1541,1565]" pageId="5" pageNumber="426" value="1964-11-25">
<collectingDate id="3E06E9A1FFCECD7F5307895EFE04F9BB" box="[344,460,1541,1565]" pageId="5" pageNumber="426" value="1964-11-25">25.XI.1964</collectingDate>
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;
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.
</paragraph>
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MATERIAL EXAMINED. —
<emphasis id="6888EA9BFFCECD7F5325896EFE07F9E8" bold="true" box="[378,463,1589,1614]" pageId="5" pageNumber="426">Ross Sea</emphasis>
<materialsCitation id="EA943CD4FFCECD7F53B9896EFF38F911" ID-GBIF-Occurrence="3901378307" accessionNumber="RAS 14315" collectingDate="2012-01-12" collectionCode="IPEE" latitude="-75.735275" longLatPrecision="16" longitude="-172.93556" pageId="5" pageNumber="426" specimenCount="1">
6 whole-mounted adult specimens, 2 slides with isolated ovarian complex, 5 slides with isolated terminal genitalia; intestine of
<taxonomicName id="9DFC4D0AFFCECD7F53E08931FD44F924" authorityName="Norman" authorityYear="1937" box="[447,652,1642,1666]" class="Actinopterygii" family="Nototheniidae" genus="Dissostichus" kingdom="Animalia" order="Perciformes" pageId="5" pageNumber="426" phylum="Chordata" rank="species" species="mawsoni">
<emphasis id="6888EA9BFFCECD7F53E08931FD44F924" box="[447,652,1642,1666]" italics="true" pageId="5" pageNumber="426">Dissostichus mawsoni</emphasis>
</taxonomicName>
;
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,
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;
<date id="2E421049FFCECD7F534F89DFFEBDF93A" box="[272,373,1668,1692]" pageId="5" pageNumber="426" value="2012-01-12">
<collectingDate id="3E06E9A1FFCECD7F534F89DFFEBDF93A" box="[272,373,1668,1692]" pageId="5" pageNumber="426" value="2012-01-12">12.I.2012</collectingDate>
</date>
;
<collectionCode id="3CEDAE4CFFCECD7F53DE89DEFE7DF93A" box="[385,437,1669,1692]" country="Russia" httpUri="http://grbio.org/cool/q8g7-dfji" name="A.N. Severtzov Institute of Ecology and Evolution, Russian Academy of Sciences" pageId="5" pageNumber="426">IPEE</collectionCode>
RAS 14315 (for whole-mounted specimens)
</materialsCitation>
<materialsCitation id="EA943CD4FFCECD7F535589C4FF0AF94A" ID-GBIF-Occurrence="3901378304" accessionNumber="RAS 14316" collectingDate="2013-01-21" collectionCode="IPEE" latitude="-75.667496" longLatPrecision="16" longitude="-172.43361" pageId="5" pageNumber="426" specimenCount="1">
3 whole-mounted adult specimens; intestine of
<taxonomicName id="9DFC4D0AFFCECD7F50BE89C4FEE3F977" authorityName="Norman" authorityYear="1937" class="Actinopterygii" family="Nototheniidae" genus="Dissostichus" kingdom="Animalia" order="Perciformes" pageId="5" pageNumber="426" phylum="Chordata" rank="species" species="mawsoni">
<emphasis id="6888EA9BFFCECD7F50BE89C4FEE3F977" italics="true" pageId="5" pageNumber="426">Dissostichus mawsoni</emphasis>
</taxonomicName>
;
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,
<geoCoordinate id="3FC8504EFFCECD7F53F589E2FDEBF977" box="[426,547,1721,1745]" degrees="172" direction="west" minutes="26" orientation="longitude" pageId="5" pageNumber="426" precision="15" seconds="1" value="-172.43361">172°261”W</geoCoordinate>
;
<date id="2E421049FFCECD7F506E89E2FD5CF977" box="[561,660,1721,1745]" pageId="5" pageNumber="426" value="2013-01-21">
<collectingDate id="3E06E9A1FFCECD7F506E89E2FD5CF977" box="[561,660,1721,1745]" pageId="5" pageNumber="426" value="2013-01-21">21.I.2013</collectingDate>
</date>
;
<collectionCode id="3CEDAE4CFFCECD7F50FF89E1FD1BF977" box="[672,723,1722,1745]" country="Russia" httpUri="http://grbio.org/cool/q8g7-dfji" name="A.N. Severtzov Institute of Ecology and Evolution, Russian Academy of Sciences" pageId="5" pageNumber="426">IPEE</collectionCode>
RAS 14316
</materialsCitation>
<materialsCitation id="EA943CD4FFCECD7F5286898FFD03F8A0" ID-GBIF-Occurrence="3901378305" accessionNumber="RAS 14317" collectingDate="2013-01-26" collectionCode="IPEE" latitude="-75.467224" longLatPrecision="16" longitude="-174.61833" pageId="5" pageNumber="426" specimenCount="1">
1 whole-mounted adult specimen; intestine of
<taxonomicName id="9DFC4D0AFFCECD7F50C4898FFF1BF8A0" authorityName="Norman" authorityYear="1937" class="Actinopterygii" family="Nototheniidae" genus="Dissostichus" kingdom="Animalia" order="Perciformes" pageId="5" pageNumber="426" phylum="Chordata" rank="species" species="mawsoni">
<emphasis id="6888EA9BFFCECD7F50C4898FFF1BF8A0" italics="true" pageId="5" pageNumber="426">Dissostichus mawsoni</emphasis>
</taxonomicName>
;
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,
<geoCoordinate id="3FC8504EFFCECD7F531989B5FE73F8A0" box="[326,443,1774,1798]" degrees="174" direction="west" minutes="37" orientation="longitude" pageId="5" pageNumber="426" precision="15" seconds="6" value="-174.61833">174°376”W</geoCoordinate>
;
<date id="2E421049FFCECD7F539A89B5FDEBF8A0" box="[453,547,1774,1798]" pageId="5" pageNumber="426" value="2013-01-26">
<collectingDate id="3E06E9A1FFCECD7F539A89B5FDEBF8A0" box="[453,547,1774,1798]" pageId="5" pageNumber="426" value="2013-01-26">26.I.2013</collectingDate>
</date>
;
<collectionCode id="3CEDAE4CFFCECD7F507489B4FD94F8A0" box="[555,604,1775,1798]" country="Russia" httpUri="http://grbio.org/cool/q8g7-dfji" name="A.N. Severtzov Institute of Ecology and Evolution, Russian Academy of Sciences" pageId="5" pageNumber="426">IPEE</collectionCode>
RAS 14317
</materialsCitation>
<materialsCitation id="EA943CD4FFCECD7F508289B5FD35F89D" ID-GBIF-Occurrence="3901378306" accessionNumber="OK644193" collectingDate="2012-01-12" latitude="-75.417496" longLatPrecision="16" longitude="-174.53528" pageId="5" pageNumber="426" specimenCount="1">
1 sequenced adult specimen; intestine of
<taxonomicName id="9DFC4D0AFFCECD7F53858852FD5FF886" authorityName="Norman" authorityYear="1937" box="[474,663,1801,1825]" class="Actinopterygii" family="Nototheniidae" genus="Dissostichus" kingdom="Animalia" order="Perciformes" pageId="5" pageNumber="426" phylum="Chordata" rank="species" species="mawsoni">
<emphasis id="6888EA9BFFCECD7F53858852FD5FF886" box="[474,663,1801,1825]" italics="true" pageId="5" pageNumber="426">Dissostichus mawsoni</emphasis>
</taxonomicName>
;
<geoCoordinate id="3FC8504EFFCECD7F50FE8853FCCBF886" box="[673,771,1800,1824]" degrees="75" direction="south" minutes="25" orientation="latitude" pageId="5" pageNumber="426" precision="15" seconds="3" value="-75.417496">75°253”S</geoCoordinate>
,
<geoCoordinate id="3FC8504EFFCECD7F52DB8878FF34F89D" box="[132,252,1827,1851]" degrees="174" direction="west" minutes="32" orientation="longitude" pageId="5" pageNumber="426" precision="15" seconds="7" value="-174.53528">174°327”W</geoCoordinate>
;
<date id="2E421049FFCECD7F53568878FEA2F89D" box="[265,362,1827,1851]" pageId="5" pageNumber="426" value="2012-01-12">
<collectingDate id="3E06E9A1FFCECD7F53568878FEA2F89D" box="[265,362,1827,1851]" pageId="5" pageNumber="426" value="2012-01-12">12.I.2012</collectingDate>
</date>
; GenBank:
<accessionNumber id="45AFAB6AFFCECD7F53838878FD83F89D" box="[476,587,1827,1851]" httpUri="https://www.ncbi.nlm.nih.gov/nuccore/OK644193" pageId="5" pageNumber="426" type="GenBank">OK644193</accessionNumber>
(28S rRNA gene)
</materialsCitation>
.
</paragraph>
</subSubSection>
<subSubSection id="12E66502FFCECD7C52DB8829FBC8F84D" lastPageId="6" lastPageNumber="427" pageId="5" pageNumber="426" type="description">
<paragraph id="5A433689FFCECD7F52DB8829FEDDF82A" blockId="5.[132,776,1906,2028]" box="[132,277,1906,1932]" pageId="5" pageNumber="426">DESCRIPTION</paragraph>
<paragraph id="5A433689FFCECD7F52DB88CAFDEDF80D" blockId="5.[132,776,1906,2028]" box="[132,549,1937,1963]" pageId="5" pageNumber="426">
<emphasis id="6888EA9BFFCECD7F52DB88CAFDEDF80D" box="[132,549,1937,1963]" italics="true" pageId="5" pageNumber="426">General morphology and digestive system</emphasis>
</paragraph>
<paragraph id="5A433689FFCECD7F52DB88EAFAF3FAEB" blockId="5.[132,776,1906,2028]" lastBlockId="5.[810,1458,1044,1358]" pageId="5" pageNumber="426">
Body elongate-oval, length
<geoCoordinate id="3FC8504EFFCECD7F53F488EAFE23F86A" box="[427,491,1969,1996]" degrees="2.969" direction="north" orientation="latitude" pageId="5" pageNumber="426" precision="55" value="2.969">2.969</geoCoordinate>
<geoCoordinate id="3FC8504EFFCECD7F53B488EAFDFAF86A" box="[491,562,1969,1996]" degrees="5.895" direction="west" orientation="longitude" pageId="5" pageNumber="426" precision="55" value="-5.895">-5.895</geoCoordinate>
(3.844), maximum width 799-1.527 (1.174) at mid-body. Tegument unarmed. Pre-oral lobe absent. Oral sucker cup-shaped, 357-499 (419) / 271-585 (419), mouth opening terminal. Ventral sucker globular or subglobular, 357-628 (475) / 399-585 (497). Oral sucker to ventral sucker width ratio 1:1.00-1.53 (1:1.22). Forebody 24.5-30.9 (27.7)% of body length. Prepharynx short, distinct. Pharynx well-developed, 113-191 (149) / 106-184 (141). Oesophagus 92-289 (171). Pharyngeal and oesophagus glands distinct. Intestinal bifurcation in middle or posterior third of forebody. Caeca blind; distance from caecal ends to posterior end of body reaching 395-1031 (641).
</paragraph>
<paragraph id="5A433689FFCECD7F51728A28FBE5FA2B" blockId="5.[811,1457,1395,1868]" box="[813,1069,1395,1421]" pageId="5" pageNumber="426">
<emphasis id="6888EA9BFFCECD7F51728A28FBE5FA2B" box="[813,1069,1395,1421]" italics="true" pageId="5" pageNumber="426">Male reproductive system</emphasis>
</paragraph>
<paragraph id="5A433689FFCECD7F51728ACFFA78F8ED" blockId="5.[811,1457,1395,1868]" pageId="5" pageNumber="426">Two testes, variously lobed, separate to slightly overlapped, oblique, post-equatorial; anterior testis sinistro-submedian, 257-514 (390) / 285-499 (384), posterior testis median or dextro-submedian, 299-528 (408) / 314-585 (445). Posttesticular region 23.3-33.3 (27.4)% of body length. Cirrus-sac well developed, 311-735 (589) / 155-261 (201), overlaps usually 20.5-78.8 (44.6)% of ventral sucker, occasionally extends to 142 beyond posterior margin of ventral sucker. Internal seminal vesicle long, tubular, folded. Pars prostatica tubular, surrounded by numerous prostatic gland-cells. Ejaculatory duct and cirrus distinct, surrounded by spongy tissue. Genital atrium distinct. Genital pore usually median, occasionally slightly dextro-submedian, just posterior to intestinal bifurcation, 169-424 (225) from anterior margin of ventral sucker.</paragraph>
<paragraph id="5A433689FFCECD7F5172882AFB88F82D" blockId="5.[813,1457,1905,2028]" box="[813,1088,1905,1931]" pageId="5" pageNumber="426">
<emphasis id="6888EA9BFFCECD7F5172882AFB88F82D" box="[813,1088,1905,1931]" italics="true" pageId="5" pageNumber="426">Female reproductive system</emphasis>
</paragraph>
<paragraph id="5A433689FFCECD7C517288CAFBD4F88A" blockId="5.[813,1457,1905,2028]" lastBlockId="6.[811,1457,1586,1836]" lastPageId="6" lastPageNumber="427" pageId="5" pageNumber="426">Ovary variously lobed, median or dextro-submedian, anterodextral to anterior testis, separate or slightly overlapping, 200-414 (258) / 285-599 (409). Oviduct anterior to ovary, forming oötype after connecting with canalicular seminal receptacle and common vitelline reservoir duct. Ovicapt distinct. Canalicular seminal receptacle saccular, antero-dextral to ovary. Laurers canal opening sinistro-submedially approximately at level of anterior margin of seminal receptacle. Mehlis gland extensive, diffuse. Uterus pre-ovarian, coiled, intercaecal. Metraterm muscular, opening into genital atrium antero-dorsally.Eggs operculate, with long, unipolar filament; length without filament 66.8-85.0 (77.9), width 30.4-42.5 (35.7). Vitellarium follicular; follicles in two lateral fields, extending from intestinal bifurcation level or from genital pore level or, occasionally, from midlevel distance between genital pore and anterior margin of ventral sucker to near posterior end of body; fields overlapping caeca along entire length dorsally and at level of posterior testis and in posttesticular region ventrally, encroaching over ventral surface of caeca at level of proximal uterine coils, ovary and anterior testis, extracaecal on ventral side of body anteriorly to ovary, usually not confluent, occasionally almost confluent in posttesticular region but distinctly separated over excretory vesicle; anterior border of ventral follicles some distance posterior to that of dorsal follicles.</paragraph>
<caption id="0E836601FFCDCD7C52DB8AF3FBA0FA58" ID-DOI="http://doi.org/10.5281/zenodo.7076019" ID-Zenodo-Dep="7076019" httpUri="https://zenodo.org/record/7076019/files/figure.png" pageId="6" pageNumber="427" startId="6.[132,143,1448,1466]" targetBox="[164,1417,219,1391]" targetPageId="6">
<paragraph id="5A433689FFCDCD7C52DB8AF3FBA0FA58" blockId="6.[132,1457,1448,1534]" pageId="6" pageNumber="427">
FIG. 1. —
<taxonomicName id="9DFC4D0AFFCDCD7C528D8AF3FD85FA1C" authority="Holloway &amp; Bier, 1968" authorityName="Holloway &amp; Bier" authorityYear="1968" box="[210,589,1448,1466]" class="Trematoda" family="Opecoelidae" genus="Helicometra" kingdom="Animalia" order="Plagiorchiida" pageId="6" pageNumber="427" phylum="Platyhelminthes" rank="species" species="antarcticae">
<emphasis id="6888EA9BFFCDCD7C528D8AF3FE5DFA1C" box="[210,405,1448,1466]" italics="true" pageId="6" pageNumber="427">Helicometra antarcticae</emphasis>
<bibRefCitation id="3E6D4B78FFCDCD7C53C58AF3FD85FA1C" author="Holloway &amp; Bier" box="[410,589,1448,1466]" firstAuthor="Holloway" pageId="6" pageNumber="427" pagination="30 - 34" refId="ref7924" refString="HOLLOWAY H. L. &amp; BIER J. W. 1968. - Helicometra antarcticae sp. nov. from Antarctic coastal fishes. Proceedings of the Helminthological Society of Washington 35: 30 - 34." type="journal article" year="1968">Holloway &amp; Bier,1968</bibRefCitation>
</taxonomicName>
from intestine of the Antarctic toothfish,
<taxonomicName id="9DFC4D0AFFCDCD7C51C78AF3FB03FA1C" authority="Norman, 1937" authorityName="Norman" authorityYear="1937" box="[920,1227,1448,1466]" class="Actinopterygii" family="Nototheniidae" genus="Dissostichus" kingdom="Animalia" order="Perciformes" pageId="6" pageNumber="427" phylum="Chordata" rank="species" species="mawsoni">
<emphasis id="6888EA9BFFCDCD7C51C78AF3FB87FA1C" box="[920,1103,1448,1466]" italics="true" pageId="6" pageNumber="427">Dissostichus mawsoni</emphasis>
Norman,1937
</taxonomicName>
, Ross Sea:
<emphasis id="6888EA9BFFCDCD7C57768AF3FAFEFA1C" bold="true" box="[1321,1334,1448,1466]" pageId="6" pageNumber="427">A</emphasis>
, whole mount, ventral view;
<emphasis id="6888EA9BFFCDCD7C52AB8AE5FEC9FA76" bold="true" box="[244,257,1470,1488]" pageId="6" pageNumber="427">B</emphasis>
, terminal genitalia, lateral view;
<emphasis id="6888EA9BFFCDCD7C504C8AE5FDE9FA76" bold="true" box="[531,545,1470,1488]" pageId="6" pageNumber="427">C</emphasis>
, ovarian complex, ventral view. Abbreviations:
<emphasis id="6888EA9BFFCDCD7C51EE8A99FC73FA69" bold="true" box="[945,955,1474,1487]" pageId="6" pageNumber="427">С</emphasis>
, cirrus everted through genital atrium;
<emphasis id="6888EA9BFFCDCD7C57588AE5FADFFA76" bold="true" box="[1287,1303,1470,1488]" pageId="6" pageNumber="427">ej</emphasis>
, ejaculatory duct;
<emphasis id="6888EA9BFFCDCD7C52DB8A8EFF52FA41" bold="true" box="[132,154,1493,1511]" pageId="6" pageNumber="427">ga</emphasis>
, genital atrium;
<emphasis id="6888EA9BFFCDCD7C537F8A8EFEF1FA41" bold="true" box="[288,313,1493,1511]" pageId="6" pageNumber="427">isv</emphasis>
, internal seminal vesicle;
<emphasis id="6888EA9BFFCDCD7C50518A8EFDD6FA41" bold="true" box="[526,542,1493,1511]" pageId="6" pageNumber="427">lc</emphasis>
, Laurers canal;
<emphasis id="6888EA9BFFCDCD7C50FA8A8EFD09FA41" bold="true" box="[677,705,1493,1511]" pageId="6" pageNumber="427">mg</emphasis>
, Mehlis gland cells;
<emphasis id="6888EA9BFFCDCD7C512F8A8EFC4FFA41" bold="true" box="[880,903,1493,1511]" pageId="6" pageNumber="427">mt</emphasis>
, metraterm;
<emphasis id="6888EA9BFFCDCD7C51AD8A8EFBC0FA41" bold="true" box="[1010,1032,1493,1511]" pageId="6" pageNumber="427">oc</emphasis>
, ovicapt;
<emphasis id="6888EA9BFFCDCD7C56058A8EFBB9FA41" bold="true" box="[1114,1137,1493,1511]" pageId="6" pageNumber="427">oo</emphasis>
, oÖtype;
<emphasis id="6888EA9BFFCDCD7C56E08A8EFB1CFA41" bold="true" box="[1215,1236,1493,1511]" pageId="6" pageNumber="427">ov</emphasis>
, ovary;
<emphasis id="6888EA9BFFCDCD7C57498A8EFAE4FA41" bold="true" box="[1302,1324,1493,1511]" pageId="6" pageNumber="427">pc</emphasis>
, prostatic cells;
<emphasis id="6888EA9BFFCDCD7C52DB8AB7FF53FA58" bold="true" box="[132,155,1516,1534]" pageId="6" pageNumber="427">pp</emphasis>
, pars prostatica;
<emphasis id="6888EA9BFFCDCD7C53728AB7FEF6FA58" bold="true" box="[301,318,1516,1534]" pageId="6" pageNumber="427">sr</emphasis>
, seminal receptacle;
<emphasis id="6888EA9BFFCDCD7C53B08AB7FDC8FA58" bold="true" box="[495,512,1516,1534]" pageId="6" pageNumber="427">vr</emphasis>
, common vitelline reservoir. Scale bars: A, 1 mm; B, 0.2 mm; C, 0.08 mm.
</paragraph>
</caption>
<paragraph id="5A433689FFCDCD7C51728809FC1AF8CD" blockId="6.[811,1455,1874,2027]" box="[813,978,1874,1899]" pageId="6" pageNumber="427">
<emphasis id="6888EA9BFFCDCD7C51728809FC1AF8CD" box="[813,978,1874,1899]" italics="true" pageId="6" pageNumber="427">Excretory system</emphasis>
</paragraph>
<paragraph id="5A433689FFCDCD7C51728829FBC8F84D" blockId="6.[811,1455,1874,2027]" pageId="6" pageNumber="427">Excretory pore terminal. Excretory vesicle I-shaped, extending approximately to posterior margin of ventral sucker; posterior end surrounded by numerous glands and small subterminal muscular sphincter.</paragraph>
</subSubSection>
</treatment>
</document>