Gordeev I.I.1, Polyakova T.A.2 2020. The first record of Pseudanthobothrium hanseni Baer, 1956 (Cestoda: Echeneibothriidae) in the White Sea // Invertebrate Zoology. Vol.17. No.4: 361–369 [in English].
1 Lomonosov Moscow State University, Leninskiye Gory 1/12, 119234, Moscow, Russia. E-mail: firstname.lastname@example.org
2 The A.O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Nakhimov Av. 2, 299011, Sevastopol, Russia. E-mail: email@example.com
ABSTRACT: Cestodes are fairly common in teleost fishes in the White Sea but have never been previously recorded there in elasmobranchs. We found seven individuals of the cestode Pseudanthobothrium hanseni in a single specimen of the starry ray Amblyraja radiata caught in the White Sea. Molecular analysis based on partial 28S rDNA sequence confirmed that our specimens belonged to this species. Their morphological and morphometric features were compared with the descriptions of P. hanseni available in the literature. Specimens of P. hanseni from the White Sea were smaller than those from the other areas, had fewer testes, and the vitelline follicles in their mature terminal proglottids did not reach the proglottid’s posterior end. The reasons of these differences are unclear, but the low salinity of the White Sea may play a certain role. To sum up, in this study we provided the first record of a cestode in an elasmobranch in the White Sea and added a new point to the distribution of P. hanseni.
KEY WORDS: tapeworm, skate, White Sea, 28S rDNA, helminth, Arctic.