New morphological data on the acanthocephalan Hypoechinorhynchus magellanicus Szidat, 1950 (Palaeacanthocephala: Arhythmacanthidae)
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Hypoechinorhynchus magellanicus Szidat, 1950 (Acanthocephala: Arhythmacanthidae) is redescribed based on specimens collected from a sub-Antarctic notothenioid fish, Champsocephalus esox (Günther). The host was caught in the Beagle Channel (Magellanic sub-region). H. magellanicus has a trunk with an antero-dorsal curvature, a spherical proboscis, spines on the anterior region of the trunk, narrow lemnisci which are considerably longer than the proboscis receptacle, six cement glands and a single vaginal sphincter. The proboscis is armed with 40 hooks, including 15 large hooks with roots and 25 rootless basal spines. The large hooks are arranged in 10 alternate rows of one and two hooks. Each single large hook is followed by two spines, and pairs of large hooks are followed by single spines. Ten single spines are also present at the base of the proboscis between the rows. The eggs have polar prolongations of the middle envelope.
KeywordsRoot Length Basal Width Single Spine Basal Spine Blade Length
This study was supported by the Grant 2 PO4C 016 26 from the Ministry of Education and Science, Poland. The authors are grateful to Professor Stanisław Rakusa-Suszczewski, from the Department of Antarctic Biology in Warszawa, and Director Vitaly Litvinov and Dr Gennady Milinevsky, from the Ukrainian Antarctic Center in Kiev, for our inclusion in the staff of the Seventh Ukrainian Antarctic Expedition and for logistic help with our research. Thanks are also due to members of the Sixth and Seventh Expeditions for their help during the collection of fishes on board the RV ‘Gorizont’ and at the Vernadsky Station. The authors are grateful to two anonymous reviewers for valuable comments and corrections.
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