Careproctus longidigitus, a new snailfish (Liparidae) from the southern Sea of Okhotsk


A new snailfish, Careproctus longidigitus, is described on the basis of four specimens collected off the Shiretoko Peninsula, Hokkaido, Japan. The new species is most similar to C. notosaikaiensis Kai, Ikeguchi, and Nakabo 2011 (Sea of Japan) and C. rausuensis Machi, Nobetsu, and Yabe 2012 (southern Sea of Okhotsk), having similar numbers of dorsal- (50–53 in C. longidigitus vs. 52 and 50–55, respectively) and anal-fin rays (45–47 vs. 46–47 and 45–48, respectively), similar number of vertebrae (58–59 vs. 57–58 and 56–59, respectively), the pectoral fin with a distinct notch, trilobed teeth, chin pores in a single pit, and a moderately sized pelvic disk (disk length: 5.7–6.5% SL vs. 5.6–7.0% SL, 5.7–6.7% SL, respectively). However, the former differs from both in having fewer pectoral-fin rays (28–32 vs. 35–37 and 34–37, respectively), lower 4 or 5 pectoral-fin rays filamentous and nearly completely free of membrane (vs. strongly exserted), and a pale stomach (vs. black stomach). The large sequence divergences in COI between C. longidigitus and C. notosaikaiensis/C. rausuensis (0.093 and 0.080 in uncorrected p-distance, respectively) also support the validity of the new species.

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We are grateful to Shigeki Fujimoto and Shigetada Fujimoto for their help in collecting specimens. Our appreciation is also extended to Y. Abe (Executive Director, AMF) and A. Komoda (General Curator, AMF) for their valuable advice and encouragement, T. Mori, H. Taira, S. Yamauchi, and M. Kamiunten (staff of AMF) for their assistance during the study, and H. Imamura, T. Kawai, and F. Tashiro (HUMZ), and J. T. Williams, D.G. Smith, S. Raredon, and K. Murphy (USNM) for access to collections. G. S. Hardy (Ngunguru, New Zealand) critically reviewed the manuscript.

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Correspondence to Yoshiaki Kai.

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Kai, Y., Matsuzaki, K. Careproctus longidigitus, a new snailfish (Liparidae) from the southern Sea of Okhotsk. Ichthyol Res 67, 133–138 (2020).

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  • Cottoidei
  • New species
  • COI
  • Shiretoko Peninsula
  • Hokkaido
  • Western North Pacific