<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The trematode <italic>Postlepidapedon opisthobifurcatum</italic> (<xref ref-type="bibr" rid="j_helm-2018-0002_ref_025_w2aab3b7b1b1b6b1ab1ac25Aa">Zdzitowiecki, 1990</xref>) is a common intestinal parasite of the gadiform fishes of the Southern Ocean. In this work, we supplement the description of the species with the anatomy of the terminal part of the reproductive system and with molecular data. The male terminal genitalia are characterised by the presence of the external seminal vesicle and cirrus-sac. The external seminal vesicle is surrounded by aciniform groups of outer prostatic cells. Groups of outer prostatic cells and proximal parts of their ducts are associated with a thin-walled membrane that is connected to the proximal edge of the cirrus-sac. The cirrus-sac is claviform, with a long proximal part accommodating the tubular, thin-walled internal seminal vesicle and ducts of outer prostatic cells. The female terminal genitalia are represented by a thick-walled metraterm, which is surrounded by aciniform groups of glandular cells. Phylogenetic analysis based on 28S rDNA partial sequences data placed <italic>P. opisthobifurcatum</italic> into the monophyletic group Lepidapedidae, including the species <italic>Myzoxenus insolens</italic> (Crowcroft, 1945), <italic>Intusatrium robustum</italic> Durio et Manter, 1968, and <italic>Postlepidapedon uberis</italic><xref ref-type="bibr" rid="j_helm-2018-0002_ref_005_w2aab3b7b1b1b6b1ab1ab5Aa">Bray, Cribb et Barker, 1997</xref>. However, we were unable to detect direct phylogenetic connections between <italic>P. opisthobifurcatum</italic> and <italic>P. uberis</italic>.</p></abstract>

The trematode Postlepidapedon opisthobifurcatum (Zdzitowiecki, 1990) is a common intestinal parasite of the gadiform fishes of the Southern Ocean. In this work, we supplement the description of the species with the anatomy of the terminal part of the reproductive system and with molecular data. The male terminal genitalia are characterised by the presence of the external seminal vesicle and cirrus-sac. The external seminal vesicle is surrounded by aciniform groups of outer prostatic cells. Groups of outer prostatic cells and proximal parts of their ducts are associated with a thin-walled membrane that is connected to the proximal edge of the cirrus-sac. The cirrus-sac is claviform, with a long proximal part accommodating the tubular, thin-walled internal seminal vesicle and ducts of outer prostatic cells. The female terminal genitalia are represented by a thick-walled metraterm, which is surrounded by aciniform groups of glandular cells. Phylogenetic analysis based on 28S rDNA partial sequences data placed P. opisthobifurcatum into the monophyletic group Lepidapedidae, including the species Myzoxenus insolens (Crowcroft, 1945), Intusatrium robustum Durio et Manter, 1968, and Postlepidapedon uberisBray, Cribb et Barker, 1997. However, we were unable to detect direct phylogenetic connections between P. opisthobifurcatum and P. uberis.

New data on the morphology and phylogenetic connections of <italic>Postlepidapedon opisthobifurcatum</italic> (Trematoda, Lepocreadioidea: Lepidapedidae), a parasite of Antarctic and sub-Antarctic fishes

Center of Parasitology, A.N. Severtsov Institute of Ecology and Evolution RAS

Russian Federal Research Institute of Fisheries and Oceanography

Helminthologia

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

New data on the morphology and phylogenetic connections of  (Trematoda, Lepocreadioidea: Lepidapedidae), a parasite of Antarctic and sub-Antarctic fishes

The trematode Postlepidapedon opisthobifurcatum (Zdzitowiecki, 1990) is a common intestinal parasite of the gadiform fishes of the Southern Ocean. In this...

New data on the morphology and phylogenetic connections of Postlepidapedon opisthobifurcatum (Trematoda, Lepocreadioidea: Lepidapedidae), a parasite of Antarctic and sub-Antarctic fishes

Publié en ligne: 26 avr. 2018

Pages: 95 - 101

Reçu: 28 août 2017

Accepté: 17 janv. 2018

DOI: https://doi.org/10.2478/helm-2018-0002

Mots clés
Trematoda, Lepidapedidae

© 2018 S. G. Sokolov et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

New data on the morphology and phylogenetic connections of Postlepidapedon opisthobifurcatum (Trematoda, Lepocreadioidea: Lepidapedidae), a parasite of Antarctic and sub-Antarctic fishes

Publié en ligne: 26 avr. 2018

Pages: 95 - 101

Reçu: 28 août 2017

Accepté: 17 janv. 2018

DOI: https://doi.org/10.2478/helm-2018-0002

Mots clésTrematoda, Lepidapedidae

© 2018 S. G. Sokolov et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
Trematoda, Lepidapedidae