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ANATOMY OF ARCTUROSACCUS KUSSAKINI, NEW GENUS, NEW SPECIES (RHIZOCEPHALA: AKENTROGONIDA), FROM THE ULTRAABYSSAL ISOPOD ANTARCTURUS ZENKEWITCHI KUSSAKIN (ARCTURIDAE)

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ABSTRACT Arcturosaccuskussakini, new genus, new species, is a rhizocephalan parasite of the ultraabyssal isopod crustacean Antarcturus zenkewitchi Kussakin, collected off the east coast of Iturup Island, Kuril Islands, Russia. The morphology of the Rhizocephala Akentrogonida is reviewed and compared to this new species. Arcturosaccus has multiple layers of cuticle in the mesenteric canal, and a few spermatogenic islets floating free in the mantle cavity. By these characters, the new species seems most closely related to the genera Duplorbis and Cryptogaster, but differs from them by (1) the presence of the paired ovary, (2) the position of the mesentery, and (3) the mantle aperture, and by the shape of the externa. Naupliar instars are absent in the life cycle of Arcturosaccus kussakini and the larvae hatch as cyprids.

10.1163/193724092X00067
/content/journals/10.1163/193724092x00067
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/content/journals/10.1163/193724092x00067
2017-12-16

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