hadrocephalus, Melodichthys Nielsen [J. G.] & Cohen [D. M.] 1986:383, Figs. 1-3 [Cybium v. 10 (no. 4); ref. 6039] Celtic Sea, 48°00'N, 8°00'W, depth 300-400 meters. Holotype (unique): MNHN 1986-0392. •Valid as Melodichthys hadrocephalus Nielsen & Cohen 1986 -- (Nielsen & Cohen in Nielsen et al. 1999:124 [ref. 24448], Nielsen et al. 2004:40 [ref. 27738], Møller et al. 2016:Appendix A [ref. 34432] in Bythitidae). Current status: Valid as Melodichthys hadrocephalus Nielsen & Cohen 1986. Bythitidae. Distribution: Eastern North Pacific. Habitat: marine.