Rhodichthys regina Collett, 1879. Threadfin Seasnail. To about 32 cm (12.6 in) TL. Circumpolar in Arctic basins. Canada Basin north of Alaska. Depth: 400–500 to 2,365 m (1,312 –1,640 to 7,757 ft). All in Mecklenburg et al. (2016).