TY - JOUR

T1 - Phylogenetic Assessment of Two Antarctic Representatives of Paralepidapedon Shimazu & Shimura, 1984 (Trematoda: Lepidapedidae)

AU - Sokolov, S. G.

AU - Shchenkov, S. V.

AU - Gordeev, I. I.

N1 - Sokolov, S.G., Shchenkov, S.V. & Gordeev, I.I. Phylogenetic Assessment of Two Antarctic Representatives of Paralepidapedon Shimazu & Shimura, 1984 (Trematoda: Lepidapedidae). Russ J Mar Biol 48, 202–212 (2022). https://doi.org/10.1134/S1063074022030087

PY - 2022

Y1 - 2022

N2 - 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.

AB - 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.

KW - Lepocreadioidea

KW - Lepidapedon

KW - Macrourus

KW - caecum

KW - uroproct

KW - parasites

UR - https://link.springer.com/article/10.1134/S1063074022030087#citeas

M3 - Article

VL - 48

SP - 202

EP - 212

JO - Russian Journal of Marine Biology

JF - Russian Journal of Marine Biology

SN - 1063-0740

ER -