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Careproctus rhomboides, a new snailfish (Cottoidei: Liparidae) from the western North Pacific

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Abstract

The new snailfish Careproctus rhomboides is described on the basis of four specimens collected from the southern Sea of Okhotsk (570–825 m depth), off Hokkaido, Japan. The new species is most similar to Careproctus bowersianus Gilbert and Burke 1912, with both species having the following characters: teeth trilobed; snout blunt; cephalic pore pattern 2-6-7-2; gill slit small above pectoral fin (or extending down in front of upper ray); pectoral fin shallowly notched; pelvic disk moderately large, ca. 20% in head length; and stomach black. The new species is distinguished from congeners, including C. bowersianus, by the following combination of characters: total vertebrae 59–61; dorsal-fin rays 56 or 57; anal-fin rays 49–52; pectoral-fin rays 32–34; pyloric caeca 13–16; cephalic pore pattern 2-6-7-2, chin pores paired in separate pits; maximum body depth 22.4–30.5% in standard length (SL); inner teeth on both jaws strongly trilobed; pelvic disk oval, slightly longer than width, length 4.3–7.7% SL (18.9–33.9% head length); gill opening small, extending to just above pectoral fin; stomach black and peritoneum pale in preserved specimens.

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Acknowledgements

We greatly appreciate the assistance of Shigeki Fujimoto and Shigetada Fujimoto in the collection of specimens, including the new species. We also thank L. Tornabene, K. Maslenikov, J. W. Orr (UW), and J. T. Williams, D. G. Smith, S. Raredon, D. Pitassy, and K. Murphy (USNM) for access to collections, and S. Raredon (USNM) for providing photos and radiographs of the holotype of C. bowersianus. T. Furukawa (Executive Director, AMF), and M. Iwata, M. Kuraishi, and M. Hibino (Curators, AMF) gave valuable advice during the study, and G. S. Hardy (Ngunguru, New Zealand) critically reviewed the manuscript. This work was supported by ISHIZUE 2022 (Kyoto University).

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Authors and Affiliations

  1. Marine Science Museum, Fukushima (Aquamarine Fukushima), Onahama, Iwaki, Fukushima, 971-8101, Japan

    Toshiaki Mori & Koji Matsuzaki

  2. Maizuru Fisheries Research Station, Field Science Education and Research Center, Kyoto University, Nagahama, Maizuru, Kyoto, 625-0086, Japan

    Yoshiaki Kai

  3. Fisheries Science Center, The Hokkaido University Museum, 3-1-1 Minato-cho, Hakodate, Hokkaido, 041-8611, Japan

    Fumihito Tashiro

Authors
  1. Toshiaki Mori
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  2. Koji Matsuzaki
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  3. Yoshiaki Kai
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  4. Fumihito Tashiro
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Correspondence to Toshiaki Mori.

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Fish species, treated in this study, are not listed as threatened or endangered by the IUCN Red List or CITES. All examined specimens were regally collected by local fishermen or fisheries surveys and registered in the fish collections of natural history museums.

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Mori, T., Matsuzaki, K., Kai, Y. et al. Careproctus rhomboides, a new snailfish (Cottoidei: Liparidae) from the western North Pacific. Ichthyol Res (2024). https://doi.org/10.1007/s10228-024-00953-5

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