Holcomycteronus profundissimus (Roule, 1913) .

To 30 cm (11.8 in) TL (Nielsen in Quéro et al. 1990). Circumglobal (Nielsen and Cohen in Nielsen et al. 1999) or possibly circumglobal (Fricke et al. 2020); Oregon (Matarese et al. 1989). Depth: 5,180 –7,160 m (16,990 –23,485 ft) (min.: Pearcy et al. 1982; max.: Nielsen and Cohen in Nielsen et al. 1999).