longus, Heteroscymnus Tanaka [S.] 1912:102, Pl. 26 (figs. 102-107) [Figures and descriptions of the fishes of Japan v. 6; ref. 6033] Tokyo fish market, Japan. Holotype (unique): ZUMT 3204 (lost). Type catalog: Aizawa et al. 2022:203 [ref. 39648]. •Tentatively a synonym of Somniosus rostratus (Risso 1827) -- (Compagno 1984:106 [ref. 6474]). •Synonym of Somniosus rostratus (Risso 1927) -- (Castro 2011:135 [ref. 31457]). •Valid as Somniosus longus (Tanaka 1912) -- (Nakaya & Shirai in Masuda et al. 1984:11 [ref. 6441], Yano et al. 2004:369, 371 [ref. 28078], Shinohara et al. 2005:395 [ref. 28370], Stewart & Last 2015:160 [ref. 34225], Dyldin 2015:56 [ref. 34524], Weigmann 2016:64 [ref. 34211], Hsu et al. 2020:8 [ref. 37776] in subgenus Rhinoscymnus). Current status: Valid as Somniosus longus (Tanaka 1912). Somniosidae. Distribution: Japan and New Zealand. Habitat: marine.