Eumicrotremus derjugini Popov, 1926 .

Leatherfin Lumpsucker. To 12.7 cm (5 in) TL (Mecklenburg et al. 2002). Most Arctic seas, including East Siberian Sea (Mecklenburg et al. 2011), Beaufort Sea (Mecklenburg et al. 2002), and one record from the eastern Chukchi Sea (71°41’N, 156°42’W; a specimen in the University of Washington, Burke Museum of Natural History and Culture Fish Collection database, UW 153106); across Arctic Canada (Coad in Coad and Reist 2018); isolated population in northern Sea of Okhotsk (Mecklenberg et al. 2016). Depth: 39–930 m (128–3,069 ft) (min.: Chernova et al. 2019; max.: Jensen 1944). Listed as shallow as 20 m (66 ft) (Federov et al. 2003).