Phylogenetic Assessment of Two Antarctic Representatives of Paralepidapedon Shimazu & Shimura, 1984 (Trematoda: Lepidapedidae)

Phylogenetic Assessment of Two Antarctic Representatives of Paralepidapedon Shimazu & Shimura, 1984 (Trematoda: Lepidapedidae)

The genus Paralepidapedon Shimazu & Shimura, 1984 unites lepidapedid trematodes with a uroproct, intercaecal and postbifurcal positions of the common genital pore, and an intestinal bifurcation located at a significant distance from the ventral sucker. Species of this genus are divided into two...

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Bibliographic Details
Published in:Russian journal of marine biology Vol. 48; no. 3; pp. 202 - 212
Main Authors: Sokolov, S. G., Shchenkov, S. V., Gordeev, I. I.
Format: Journal Article
Language:English
Published: Moscow Pleiades Publishing 01-06-2022
Springer Nature B.V
Subjects:
Biomedical and Life Sciences
Fish
Freshwater & Marine Ecology
Lepidapedon
Life Sciences
ND1 gene
Original Papers
Phylogenetics
Phylogeny
Polar environments
rRNA 28S
Seminal vesicle
Species
Lepocreadioidea
parasites
caecum
uroproct
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Summary:The genus Paralepidapedon Shimazu & Shimura, 1984 unites lepidapedid trematodes with a uroproct, intercaecal and postbifurcal positions of the common genital pore, and an intestinal bifurcation located at a significant distance from the ventral sucker. Species of this genus are divided into two groups according to presence/absence of the membranous sac around the external seminal vesicle and adjacent prostatic cells in adults. We found two trematode species morphologically corresponding to the group of Paralepidapedon spp. with the membranous sac in the gadiform fish Macrourus whitsoni (Regan, 1913) from the Ross Sea (Antarctic). These trematodes were initially assigned to Paralepidapedon sp. 1 and Paralepidapedon sp. 2. Phylogenetic analyses based on 28S rRNA gene partial sequences resolved phylogenetic relationships of these trematodes within the Lepidapedon clade. Paralepidapedon sp. 1 was also grouped with Lepidapedon spp. based on the nd1 gene analysis. These data are unexpected, since blind-ending caeca are typical of Lepidapedon spp. Phylogenetic analyses also confirmed the paraphyly of the genus Neolepidapedon Manter, 1954. Based on our data, we hypothesise that only species without the membranous sac are the members of the genus Paralepidapedon , while species with this structure should be moved to the genus Lepidapedon .
ISSN:1063-0740
1608-3377
DOI:10.1134/S1063074022030087