Derichthys serpentinus Gill, 1884 .

Neck Eel. To 40 cm (15.7 in) TL (Castle in Smith and Heemstra 1986). Circumglobal; western Pacific Ocean north to northern Japan (Balanov et al. 2009); southern California to Chile (33°S) (Fitch and Lavenberg 1968). Depth: 16–2,400 m (52–7,872 ft) (min.: Roberts et al. 2015; max.: Porteiro et al. 2017).