Description of the immature stages of the endangered Japanese endemic Oreodytes kanoi (Kamiya, 1938) (Coleoptera: Dytiscidae: Hydroporinae) and comparison with the known larvae of Oreodytes Seidlitz, 1887 Author Okada, Ryohei 0000-0002-8488-0660 Coleopterological Society of Japan. National Museum of Nature and Science, Tsukuba, 3050005 Japan. wasserinsekt @ kub. biglobe. ne. jp; https: // orcid. org / 0000 - 0002 - 8488 - 0660 wasserinsekt@kub.biglobe.ne.jp Author Alarie, Yves Department of Biology, Laurentian University, Ramsey Lake Road, P 3 E 2 C 6, Canada. text Zootaxa 2020 2020-07-27 4820 1 1 18 journal article 9184 10.11646/zootaxa.4820.1.1 0aac79a5-8fdc-415d-ade3-58ad5835c2c3 1175-5326 4397199 AED07F7B-6F71-4CDE-A923-9AB3FD84FC7C The alpinus species group Diagnosis. Larvae of the Oreodytes alpinus species-group can readily be distinguished from those of both the alaskanus and septentrionalis species-groups by the following combination of characters: size smaller: HL < 0.65 mm , 0.87 mm , 1.22 mm and FRL < 0.50 mm , 0.68 mm , 0.95 mm (instar I, II, III, respectively); each tarsus with at least one dorsal secondary seta (instars II and III).