Phylogenetic analysis of the superfamily Hemiuroidea (Platyhelminthes, Neodermata:Trematoda) based on partial 28S rDNA sequences

Abstract

In the present paper, the phylogenetic relationships between genera, subfamilies and families of the Hemiuroidea are explored. Twelve new sequences of 28 rDNA and data taken from GenBank (NSBI) on 43 species affiliated to 34 genera were included in the analysis. Most of the hemiuroidean trematodes form two highly supported clades (A and B), which are sister groups to each other.Hemipera manterijoined withGonocercaspp. with moderate statistical support. This clade is basal relative to the clades A and B. Сlade A is polytomic and contains representatives of the families Accacoeliidae, Syncoeliidae, Didymozoidae, Hirudinellidae and Sclerodistomidae, and derogenid subfamilies Derogeninae and Halipeginae. At the same time, the Syncoeliidae, Hirudinellidae and Accacoeliidae form a well-supported monophyletic group. The phylogenetic relationship between Derogeninae and Halipeginae is poorly resolved. Сlade B unites the isoparorchiid, bunocotylid, lecithasterid and hemiurid trematodes. Our data re-establishes the family Bunocotylidae, which consists of two subfamilies, Opisthadeninae and Bunocotylinae, and theMachidatrema chilostoma+Hysterolecithoides frontilatusgroup. The Bunocotylidae is the sister group to the Hemiuridae + Lecithasteridae group and the Isoparorchiidae is a basal relative to the representatives of these three hemiuroid families.

Testing the higher-level phylogenetic classification of Digenea (Platyhelminthes, Trematoda) based on nuclear rDNA sequences before entering the age of the ‘next-generation’ Tree of Life

“…These studies have resulted in more stable classification schemes of genera within families and families within superfamilies of the subclass Digenea. For example, at the superfamily level, the studies of Microphalloidea (Tkach et al, 2003), Lepocreadioidea Odhner, 1905(Bray et al 2009, Brachylaimoidea (Heneberg et al, 2016) Echinostomatoidea Looss, 1899 (Tkach et al, 2016), and the recent study of Hemiuroidea by Sokolov et al (2018), can be highlighted. Additionally, at the family level, several studies have determined the inter-relationships among genera and the re-organization of subfamilies, such as the study by Tkach et al (2001) with Omphalometridae Looss, 1899 by Choudhury et al (2007) Atopkin et al (2019) with Haploporidae.…”

Descriptions of Two Digenean Trematodes Found from a Chinese Sea Snake, Laticauda semifasciata, in Republic of Korea

“…Telford [28] later realized, and regarded his species synonymous to P. cyanovitellosus. Further studies revealed the additional distribution sites of this species, i.e., Ishigaki Island and Kudaka Island, Japan [13,29]. The present case is the fifth and northernmost report of the species.…”

Digenean parasites of deep-sea teleosts: A progress report

“…All species reported so far from the abyssal plain are either lepocreadioids, fellodistomids or ‘derogenids’. The ‘derogenid’ is Gonocerca phycidis Manter, 1925 which is now considered a member of the family Gonocercidae ( Sokolov et al, 2016a , 2018a , 2019a ). The sequences of G. phycidis and two other Gonocerca Manter, 1925 species in Sokolov's study ( G. crassa Manter, 1934 and G. muraenolepisi Parukhin & Lyadov, 1979) are derived from Antarctic fishes and a close relationship is found between these species and G. oshoro Shimazu, 1970 from a macrourid in the northern Pacific Ocean giving further evidence of the relationship of Antarctic and deep-sea forms.…”

“…The sequences of G. phycidis and two other Gonocerca Manter, 1925 species in Sokolov's study ( G. crassa Manter, 1934 and G. muraenolepisi Parukhin & Lyadov, 1979) are derived from Antarctic fishes and a close relationship is found between these species and G. oshoro Shimazu, 1970 from a macrourid in the northern Pacific Ocean giving further evidence of the relationship of Antarctic and deep-sea forms. Sokolov et al (2019a) found the Gonocercidae to be the basally derived group of the Hemiuroidea. This study presents a superfamily-wide molecular phylogeny which includes only a few deep-sea forms.…”