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Metacercaria of Steganoderma cf. eamiqtrema. Whole mount of paragenophore, ventral view (a). Oral sucker and pharynx, ventral view (b). Abbreviations: C, cecum; CS, cirrus sac; EV, excretory vesicle; G, gland cells surrounding distal end of excretory vesicle; GP, genital pore; L, Laurer’s canal; M, metraterm; MG, Mehlis’ gland; OV, ovary; OE, esophagus; OS, oral sucker; P, pharynx; PP, pars prostatica; S, seminal vesicle; SR, seminal receptacle; T, testis; U, uterus; V, vitellarium; VS, ventral sucker. Scale bars: а 1 mm; b 0.25 mm
Source publication
Metacercariae of the zoogonid trematode Steganoderma cf. eamiqtrema ex crab Chionoecetes bairdi caught in the Sea of
Okhotsk were described using morphological and molecular-genetic (ITS2 region, 28S rRNA and nd1 genes) data. These are
the first molecular-genetic data for the genus Steganoderma. The studied trematodes differed from S. eamiqtrema in...
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Citations
... The family Zoogonidae Odhner, 1902 is one of the taxonomically problematic groups of trematodes, which was periodically revised on the basis of the morphological and biological features of its representatives (Bray and Gibson, 1986;Bray, 1986, Bray, 2008, Blend et al., 2020Sokolov et al., 2021a, Kremnev et al., 2023. Bray (2008) recognised two subfamilies within the family Zoogonidae: Zoogoninae Odhner, 1902 andLepidophyllinae Stossich, 1903. ...
... Bray (2008) recognised two subfamilies within the family Zoogonidae: Zoogoninae Odhner, 1902 andLepidophyllinae Stossich, 1903. Recently, the subfamilies Cephaloporinae Yamaguti, 1934 andLecithostaphyllinae Odhner, 1911 were resurrected within Zoogonidae (Blend et al., 2020;Sokolov et al., 2021a). According to Bray (2008), the subfamily Zoogoninae comprises nine genera of intestinal trematodes of marine, anadromous, and amphidromic fishes. ...
... Kremnev et al., 2023). Results of several phylogenetic studies based on molecular data show that Zoogonodae is non-monophyletic, but formed strongly supported monophyly with representatives of Faustulidae; the problem actively discussed and still unresolved (Hall et al., 1999;Sun et al., 2014;Sokolov et al., 2021a;2021b). ...
New morphological and molecular data were generated for trematodes recovered from the intestines of the fish Pseudaspius hakonensis from two locations in the south of the Russian Far East. Morphologically, these trematodes are identical to Pseudozoogonoides ugui (Microphalloidea: Zoogonidae) from Japan. According to results of phylogenetic analysis based on 28S rDNA sequence data, P. ugui was closely related to Zoogonoides viviparus , and P. subaequiporus appears as a sister taxon to these two species. Genetic distance values, calculated based on both 28S rDNA and ITS2 rDNA, between P. ugui and Z. viviparus represents an interspecific differentiation level. Our results have an ambiguous explanation, indicating that the implication of the presence of one or two compact vitellarial aggregations for the differentiation of Zoogonoides and Pseudozoogonoides should be reconsidered or that our results open up the question of the taxonomical status of trematodes previously denoted as Z. viviparus and P. subaequiporus.
... Similarly to previous studies [37][38][39][40], the Zoogonidae was resolved within the Microphalloidea as a well-supported clade, though containing some members of the family Faustulidae ( Figure 2). The latter is known to be polyphyletic as several faustulid species fall into the superfamily Gymnophalloidea [41][42][43], thus we place this family name into the quotation marks. ...
... Monophyly of the latter was poorly supported. The former Lepidophyllinae was resolved as highly paraphyletic, and the Zoogoninae was inferred as the closest relative of the "faustulids", similarly to previous studies [37][38][39][40][41][42][43]. Other reported hosts: 20 fish species (summarized in [44]). ...
The Zoogonidae is the only digenean family where known cercariae lack the tail but actively search for the second intermediate host. However, the data on the zoogonid life cycles are scarce. In the present study, we elucidated and verified life cycles of the Zoogonidae from the White Sea. Using rDNA data, we showed that Pseudozoogonoides subaequiporus utilizes gastropods from the family Buccinidae as the first intermediate host and protobranch bivalves as the second one. This life cycle can be facultatively truncated: some cercariae of P. subaequiporus encyst within the daughter sporocysts. Molecular data also confirmed previous hypotheses on Zoogonoides viviapus life cycle with buccinid gastropods acting as the first intermediate hosts, and annelids and bivalves as the second intermediate hosts. We demonstrated the presence of short tail primordium in the developing cercariae of both species. Based on the reviewed and our own data, we hypothesize that the emergence of tailless cercariae in the evolution of the Zoogonidae is linked to the switch to non-arthropod second intermediate hosts, and that it possibly happened only in the subfamily Zoogoninae. Basally branching zoogonids have retained the ancestral second intermediate host and might have also retained the tail.
... Bray (2008 considered Lecithostaphylus as a valid genus of the subfamily Lepidophyllinae Stossich, 1904. Later, several complex studies indicated that Lecithostaphylus was phylogenetically distant from the genus Lepidophyllum Odhner, 1902 and could be separated into a distinct subfamily Lecithostaphylinae Odhner, 1911(Cabañas-Granillo et al., 2020Sokolov et al., 2021a;2021b). On the basis of molecular-based species clustering, Sokolov et al. (2021b) resurrected the subfamily Lecithostaphylinae and provided a diagnosis of Lecithostaphylinae sensu lato, including the genera Lecithostaphylus (as the type genus), Deretrema Linton, 1910, Proctophantases Odhner, 1911and Steganoderma Stafford, 1904. ...
... Later, several complex studies indicated that Lecithostaphylus was phylogenetically distant from the genus Lepidophyllum Odhner, 1902 and could be separated into a distinct subfamily Lecithostaphylinae Odhner, 1911(Cabañas-Granillo et al., 2020Sokolov et al., 2021a;2021b). On the basis of molecular-based species clustering, Sokolov et al. (2021b) resurrected the subfamily Lecithostaphylinae and provided a diagnosis of Lecithostaphylinae sensu lato, including the genera Lecithostaphylus (as the type genus), Deretrema Linton, 1910, Proctophantases Odhner, 1911and Steganoderma Stafford, 1904. ...
... Steganoderma eamiqtrema has high p-distance values, 20.44 ± 1.21%-23.68 ± 1.23%, as compared with species of Lecithostaphylinae sensu stricto by 28S rDNA sequence data, and the phylogenetic relationships of this species are poorly supported in the study by Sokolov et al. (2021b). Moreover, in our study, S. eamiqtrema (Zoogonidae) was sister to [Lecithostapyhllinae + Zoogoninae + Faustulidae (Antorchis pomacanthi, Trigonocryptus conus and Bacciger lesteri)] clade on both ML and BI trees with a high support (figs 2 and 3). ...
In this study we described two new trematode species, Lecithostaphylus halongi n. sp. (Zoogonidae, Lecithostaphylinae) and Gymnotergestia strongyluri n. sp. (Fellodistomidae, Tergestiinae), on the basis of morphological and molecular data. Adult worms of these two species were collected from, respectively, Hemiramphus spp. (Hemiramphidae) and Strongylura strongylura (Belonidae) caught in the coastal waters of Vietnam. Adult worms of L . halongi n. sp. are morphologically close to Lecithostaphylus gibsoni Cribb, Bray & Barker, 1992 ex Abudefduf whitleyi from Heron Island and Lecithostaphylus depauperati Yamaguti, 1970 ex Hemiramphus depauperatus from Hawaii, but differ from these species in having a larger cirrus sac and a different arrangement of vitelline fields. They also differ from Lecithostaphylus brayi Cabañas-Granillo, Solórzano-García, Mendoza-Garfias & Pérez-Ponce de León, 2020 in the 28S ribosomal DNA (rDNA) sequence data at the interspecific level. Adult worms of G . strongyluri n. sp. ex S . strongylura are morphologically similar to Gymnotergestia chaetodipteri , the only previously known species of this genus, described from Chaetodipterus faber in Jamaica. The new species differs from G . chaetodipteri in body shape, testicular arrangement and the size of the pharynx and eggs. The 28S rDNA-based phylogenetic analysis indicates that G . strongyluri n. sp. is closely related to Tergestia spp., rendering Tergestia paraphyletic. Genetic divergence values between G . strongyluri n. sp. and Tergestia spp. are similar to those among species in the genera Tergestia , Steringophorus and Proctoeces . Our molecular results indicate that G . strongyluri n. sp. and Tergestia spp. may belong the same genus, but additional molecular data are needed for the final conclusion.
... However, Bray [3,5] moved Anarhichotrema into the Zoogonidae based on the understanding that lissorchiids did not typically parasitise marine fish. According to the current zoogonid concept, Anarhichotrema is affiliated to the Lecithostaphylinae Odhner, 1911 sensu lato [6]. However, the lack of molecular genetic data for this genus significantly complicates evaluation of its phylogenetic position. ...
Anarhichotrema Shimazu, 1973 is a monotypic digenean genus, with the type- and only
species, Anarhichotrema ochotense Shimazu, 1973, known to infect North Pacific fishes. This genus
was originally described as a member of the Lissorchiidae (Monorchioidea) and later moved to the
Zoogonidae (Microphalloidea). Its exact phylogenetic position has remained unresolved due to the
lack of molecular data. In this study, we isolated specimens of A. ochotense from the Bering wolffish,
Anarhichas orientalis Pallas, 1814 caught in the Sea of Okhotsk, described them morphologically
and performed a molecular phylogenetic analysis of their nuclear 18S and 28S rDNA regions. The
specimens examined in our study generally corresponded to previous morphological descriptions
of A. ochotense but were noticeably smaller, possibly due to the crowding effect. The phylogenetic
analysis placed Anarhichotrema within the Lissorchiidae as a sister taxon to the group comprising
freshwater lissorchiids. Thus, we restore Anarhichotrema to the Lissorchiidae, as originally assigne.
