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The first report of a parasitic ‘turbellarian’ from a cephalopod mollusc, with description of Octopoxenus antarcticus gen. nov., sp. nov. (Platyhelminthes: Fecampiida: Notenteridae)

Published online by Cambridge University Press:  17 October 2022

I. Gordeev Open the ORCID record for I. Gordeev [Opens in a new window] ,
N. Biserova Open the ORCID record for N. Biserova [Opens in a new window] ,
K. Zhukova Open the ORCID record for K. Zhukova [Opens in a new window]  and
I. Ekimova Open the ORCID record for I. Ekimova [Opens in a new window]
I. Gordeev*
Affiliation:
Russian Federal Research Institute of Fisheries and Oceanography, Moscow, Russia Lomonosov Moscow State University, Moscow, Russia
N. Biserova
Affiliation:
Lomonosov Moscow State University, Moscow, Russia
K. Zhukova
Affiliation:
Lomonosov Moscow State University, Moscow, Russia
I. Ekimova
Affiliation:
Lomonosov Moscow State University, Moscow, Russia
*
Author for correspondence: I. Gordeev, E-mail: [email protected]
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Abstract

Parasitic ‘turbellarians’ are known from various animals such as echinoderms, crustaceans, annelids, bivalve and gastropod molluscs. So far, however, no ‘turbellarians’ have been reported from cephalopods. In this paper we report a parasitic ‘turbellarian’ from the giant Antarctic octopus, Megaleledone setebos. We dissected two specimens of M. setebos caught in the Ross Sea (Antarctica) and found numerous worms in their intestine and liver. The worms were spherical or oblong and had two morphologically different poles. The frontal pole bears a small conical protrusion containing large elongated pear-shaped frontal glands and large polygonal cells. The ducts of the frontal glands open terminally to form the frontal organ. The caudal pole has an opening shaped as a folded tube connected by the genital pore with a common genital atrium, which continues into a canal with a muscular sheath. The worms were identified as ‘turbellarians’ from the family Notenteridae (Fecampiida). This family contains only one species, Notentera ivanovi, reported from the gut of a polychaete at the White Sea. The worms that we found in the gastrointestinal tract of the octopuses were morphologically similar to N. ivanovi but differed from it in several important respects. Phylogenetic analysis based on 28S rDNA gene showed that the newly found worm clustered together with other fecampiids in a highly supported clade and was closely related to N. ivanovi. On the basis of these morphological and molecular data, we described a new species, Octopoxenus antarcticus gen. nov., sp. nov. (Fecampiida: Notenteridae), establishing a new genus to accommodate it and provided an updated diagnosis of the family Notenteridae. This is the first report of a parasitic ‘turbellarian’ from a cephalopod mollusc.

Keywords

TurbellariaflatwormsPlatyhelminthesAntarcticcephalopodsparasite
Type
Research Paper
Information
Journal of Helminthology , Volume 96 , 2022 , e73
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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