The systematics of Echinorhynchus Zoega in Muller, 1776 (Acanthocephala, Echinorhynchidae) elucidated by nuclear and mitochondrial sequence data from eight European taxa

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Wayland , M T , Vainio , J K , Gibson , D I , Herniou , E A , Littlewood , D T J & Väinölä , R 2015 , ' The systematics of Echinorhynchus Zoega in Muller, 1776 (Acanthocephala, Echinorhynchidae) elucidated by nuclear and mitochondrial sequence data from eight European taxa ' , ZooKeys , no. 484 , pp. 25-52 . https://doi.org/10.3897/zookeys.484.9132

Title: The systematics of Echinorhynchus Zoega in Muller, 1776 (Acanthocephala, Echinorhynchidae) elucidated by nuclear and mitochondrial sequence data from eight European taxa
Author: Wayland, Matthew T.; Vainio, Jouni K.; Gibson, David I.; Herniou, Elisabeth A.; Littlewood, D. Timothy J.; Väinölä, Risto
Contributor: University of Helsinki, Biosciences
University of Helsinki, Finnish Museum of Natural History
Date: 2015
Language: eng
Number of pages: 28
Belongs to series: ZooKeys
ISSN: 1313-2989
URI: http://hdl.handle.net/10138/165356
Abstract: The acanthocephalan genus Echinorhynchus Zoega in Müller, 1776 (sensu Yamaguti 1963) is a large and widespread group of parasites of teleost fish and malacostracan crustaceans, distributed from the Arctic to the Antarctic in habitats ranging from freshwaters to the deep-sea. A total of 52 species are currently recognised based on the conventional morphological species concept; however, the true diversity in the genus is masked by cryptic speciation. The considerable diversity within Echinorhynchus is an argument for subdividing the genus if monophyletic groups with supporting morphological characters can be identified. With this objective in mind, partial sequences of two genes with different rates of evolution and patterns of inheritance (nuclear 28S rRNA and mitochondrial cytochrome c oxidase subunit I) were used to infer the phylogenetic relationships among eight taxa of Echinorhynchus. These included representatives of each of three genus group taxa proposed in a controversial revision of the genus based on cement gland pattern, namely Echinorhynchus (sensu stricto), Metechinorhynchus Petrochenko, 1956 and Pseudoechinorhynchus Petrochenko, 1956. These groupings have previously been rejected by some authorities, because the diagnostic character is poorly defined; this study shows that Echinorhynchus (sensu stricto) and Metechinorhynchus are not natural, monophyletic groups. A revision of Echinorhynchus will require tandem molecular phylogenetic and morphological analyses of a larger sample of taxa, but this study has identified two morhological characters that might potentially be used to define new genera. The estimated phylogeny also provides insight into the zoogeographical history of Echinorhynchus spp. We postulate that the ancestral Echinorhynchus had a freshwater origin and the genus subsequently invaded the sea, probably several times. The freshwater taxa of the E. bothniensis Zdzitowiecki & Valtonen, 1987 clade may represent a reinvasion of freshwater by one or more ancestral marine species.
Subject: Acanthocephala
Echinorhynchus bothniensis
Echinorhynchus brayi
Echinorhynchus cinctulus
Echinorhynchus gadi
Echinorhynchus salmonis
Echinorhynchus truttae
Acanthocephalus lucii
phylogeny
molecular phylogeny
taxonomy
parasite
systematics
zoogeography
BAYESIAN PHYLOGENETIC INFERENCE
SP-N ACANTHOCEPHALA
FRESH-WATER FISHES
INTERMEDIATE HOST
GENE-SEQUENCES
MORPHOLOGICAL VARIABILITY
SALMONIS ACANTHOCEPHALA
LUCII ACANTHOCEPHALA
MYSIS-RELICTA
BOTHNIAN BAY
1181 Ecology, evolutionary biology
1172 Environmental sciences
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