Okanishi Masanori, Matsuo Takumi, Fujita Toshihiko
Misaki Marine Biological Station, Graduate School of Science, The University of Tokyo, 1024 Koajiro, Misaki, Miura 238-0225, Japan. E-mail:
National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba 305-0005, Japan. E-mail:
Zool Stud. 2021 Oct 19;60:e59. doi: 10.6620/ZS.2021.60-59. eCollection 2021.
A new species, , is described based on five specimens collected from deep water settings, southeast of Cape Erimo, Hokkaido, Japan. sp. n. is distinguished from other congeners based on the following characters: elongate semi-circular and separated radial shields; triangular oral shields; flat and broad tentacle scales on the second tentacle pore; octagonal dorsal arm plates, approximately three times wider than long on proximal portion of the arm; and three arm spines present proximally on the arm. This is the first record of the genus from Japanese waters. The nucleotide sequence for sp. n. is provided.