Careproctus iacchus, a new variegated snailfish (Liparidae) from the Seas of Japan and Okhotsk


A new species of snailfishes, Careproctus iacchus, is described on the basis of three specimens collected from the Seas of Japan and Okhotsk. Among the species of Careproctus, the new species is most similar to Careproctus comus and Careproctus faunus, both known from the Aleutian Islands, in having a variegated body coloration. However, it can be distinguished in having 44–46 dorsal- and 39–40 anal-fin rays (vs. 50–56 and 44–50 in C. comus and 47–51 and 41–45 in C. faunus, respectively), a pectoral fin without a notch (vs. both with a shallow notch), no interradial fenestra between proximal radials two and three in the pectoral girdle (vs. both having a fenestra between proximal radials two and three), a gill slit entirely above the pectoral fin (extending to just above the pectoral fin or to 1–5th ray), a body with many white spots (vs. mottled with red and white), and a large white blotch on cheek (vs. no distinct markings on cheek) when fresh.

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We greatly appreciate the captains and crews of R/V Mizuho-maru, Kaiyo-maru No. 5, and Tansei-maru for the collection of new species. Our appreciation is also extended to G. Shinohara and M. Nakae (NSMT), M. Yabe, H. Imamura, and T. Kawai (HUMZ), J. T. Williams, D.G. Smith, S. Raredon, and K. Murphy (USNM) for access to collections, and K. P. Maslenikov (UW) for the loan of specimens. J. W. Orr (NOAA, Alaska Fisheries Science Center) provided the X-rays of paratypes of C. comus and C. faunus and critically reviewed the manuscript.

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Correspondence to Yoshiaki Kai.

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This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as CCE5895A-8996-4235-B831-B5274745BD54.

This article was published as an Online First article on the online publication date shown on this page. The article should be cited by using the doi number.

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Kai, Y., Tohkairin, A., Fujiwara, K. et al. Careproctus iacchus, a new variegated snailfish (Liparidae) from the Seas of Japan and Okhotsk. Ichthyol Res 65, 417–422 (2018).

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  • Careproctus comus
  • Careproctus faunus
  • New species
  • COI
  • Western North Pacific