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An amended description of two Gyrodactylus species (Platyhelminthes: Monogenea) parasitizing Antarctic Notothenioid fish

Published online by Cambridge University Press:  06 December 2018

I. Heglasová ,
V. Nezhybová  and
I. Přikrylová Open the ORCID record for I. Přikrylová [Opens in a new window]
I. Heglasová
Affiliation:
Department of Zoology, Faculty of Science, Comenius University in Bratislava, Bratislava, Slovak Republic Institute of Parasitology, Slovak Academy of Sciences, Košice, Slovak Republic
V. Nezhybová
Affiliation:
Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Brno, Czech Republic Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
I. Přikrylová*
Affiliation:
Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic Water Research Group, Unit for Environmental Sciences and Development, North West University, Potchefstroom, South Africa Department of Biodiversity, School of Molecular and Life Sciences, University of Limpopo, Sovenga, South Africa
*
Author for correspondence: I. Přikrylová, E-mail: [email protected]
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Abstract

Species identification based on the morphometry of opisthaptoral hard parts, in combination with internal transcribed spacer ribosomal DNA (ITS rDNA) region sequences, confirmed the presence of four viviparous Gyrodactylus von Nordman, 1832 (Plathyhelminthes, Monogenea) species on Nototheniid fish from the Prince Gustav Channel (Weddell Sea, Antarctica). Gyrodactylus antarcticus Gusev, 1967 was found mostly on Trematomus newnesi Boulenger (93 specimens) but also on T. bernacchii Boulenger (one specimen), the latter representing a new host record for this species. Gyrodactylus byrdi Hargis & Dillon, 1968 and G. coriicepsi Rokicka, Lumme & Ziętara, 2009 were recorded on their type hosts, T. newnesi and Notothenia coriiceps Richardson, respectively. Gyrodactylus wilkesi Hargis & Dillon, 1968 was found mostly on the fins of T. bernacchii (29 specimens), but also on T. hansoni Boulenger (one specimen) and T. newnesi (three specimens). The finding of G. wilkesi on T. newnesi represents a new host record. The low number of Gyrodactylus specimens may indicate an accidental infection. The occurence of all four Gyrodactylus species in the Prince Gustav Channel represents a new locality record. According to phylogentic methods, the newly redescribed monogeneans belong to the Antarctic lineage, forming a sister group to North American and European marine Gyrodactylus species, and consist of two species groups, one comprising G. coriicepsi and G. nudifronsi Rokicka, Lumme & Ziętara, 2009, and the other G. anarcticus and G. wilkesi.

Keywords

AntarcticaITS rDNAmorphologyNototheniaphylogenyTrematomus
Type
Research Paper
Information
Journal of Helminthology , Volume 94 , 2020 , e20
Copyright
Copyright © Cambridge University Press 2018 

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