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).