Notacanthus chemnitzii Bloch, 1788.

Snubnosed Spiny Eel. To 135 cm (54 in) TL (Mecklenburg et al. 2018). Probably circumglobal; Greenland (Okamura and Takahashi in Okamura et al. 1995); western Pacific Ocean off Japan (Yabe in Amaoka et al. 1983); Sea of Okhotsk (Orlov 1998); northern Bering Sea (59°22’N, 178°28’W) (Maslenikov et al. 2013) to Chile (Pequeño 1989). Benthopelagic; depth: 126–3,285 m (413–10,775 ft) (min.: Orlov and Tokranov 2019; max.: Yabe in Amaoka et al. 1983); usually taken at the greater depths (Mecklenburg et al. 2002). Either a single species with some intraspecific variation (Mecklenburg et al. 2018) or a species complex (Robertson et al. 2017).

Polyacanthonotus challengeri (Vaillant, 1888).

Longnose Tapirfish. To about 60 cm (23.6 in) TL (Gon in Gon and Heemstra 1990). Circumglobal, predominantly antitropical, on the continental rise; western Pacific Ocean north off northern Sea of Japan off Hokkaido (Yabe in Amaoka et al. 1983) and western North Pacific off southern Honshu (Crabtree et al. 1985) to northern Bering Sea (60°10’N, 179°41’W) (Maslenikov et al. 2013) to Cape Falcon, Oregon (Stein and Butler 1971). Benthopelagic; depth: 700–3,753 m (2,296 –12,313 ft) (min.: Smith in Carpenter and De Angelis 2016; max.: Sulak et al. 1984).

Polyacanthonotus challengeri (Vaillant, 1888).

Longnose Tapirfish. To about 60 cm (23.6 in) TL (Gon in Gon and Heemstra 1990). Circumglobal, predominantly antitropical, on the continental rise; western Pacific Ocean north off northern Sea of Japan off Hokkaido (Yabe in Amaoka et al. 1983) and western North Pacific off southern Honshu (Crabtree et al. 1985) to northern Bering Sea (60°10’N, 179°41’W) (Maslenikov et al. 2013) to Cape Falcon, Oregon (Stein and Butler 1971). Benthopelagic; depth: 700–3,753 m (2,296 –12,313 ft) (min.: Smith in Carpenter and De Angelis 2016; max.: Sulak et al. 1984).