Osteodiscus abyssicola, a new snailfish (Cottoidei: Liparidae) collected off the Pacific coast of northern Japan Author Murasaki, Kenta Institute of Oceanic Research and Development, Tokai University, 3 - 20 - 1 Orido, Shimizu-ku, Shizuoka 424 - 8610, Japan Author Kai, Yoshiaki 0000-0002-0991-5173 Maizuru Fisheries Research Station, Field Science Education and Research Center, Kyoto University, Nagahama, Maizuru, Kyoto 625 - 0086, Japan. kai. yoshiaki. 4 c @ kyoto-u. ac. Jp; https: // orcid. org / 0000 - 0002 - 0991 - 5173 Author Endo, Hiromitsu 0000-0001-6916-6322 Laboratory of Marine Biology, Faculty of Science and Technology, Kochi University, 2 - 5 - 1 Akebono-cho, Kochi 780 - 8520, Japan endoh @ kochi-u. ac. Jp; https: // orcid. org / 0000 - 0001 - 6916 - 6322 Author Fukui, Atsushi 0000-0001-5195-9068 School of Marine Science and Technology, Tokai University, 3 - 20 - 1 Orido, Shimizu-ku, Shizuoka 424 - 8610, Japan afukui @ scc. u-tokai. ac. Jp; https: // orcid. org / 0000 - 0001 - 5195 - 9068 text Zootaxa 2021 2021-09-06 5032 1 136 142 journal article 10.11646/zootaxa.5032.1.8 1175-5326 5477750 FB5CA2AF-B3E9-4A19-AB31-33BFB7D24885 Key to species of Osteodiscus 1a. Mouth distinctly oblique, principal caudal-fin rays 9............................................. O. rhepostomias 1b. Mouth horizontal, principal caudal-fin rays 6–8............................................................. 2 2a. Pectoral fin unnotched, teeth blunt, anal-fin rays 46–49............................................ O. andriashevi 2b. Pectoral fin notched, teeth sharp, anal-fin rays 39–44......................................................... 3 3a. Pelvic disk to anus about 1–4 % HL, pyloric caeca absent............................................ O. cascadiae 3b. Pelvic disk to anus about 16% HL, pyloric caeca present..................................... O. abyssicola sp. nov.