japonicus, Myxocephalus Steindachner [F.] & Döderlein [L.] 1887:281 [25] [Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Classe. v. 53 (1. abth.); ref. 4249] Sagami Sea, off Tokyo, Japan. Holotype (unique): RMNH. •Valid as Diplacanthopoma japonicus (Steindachner & Döderlein 1887) -- (Machida in Masuda et al. 1984:101 [ref. 6441], Machida 1988:69 [ref. 13418], Nielsen & Cohen in Nielsen et al. 1999:102 [ref. 24448], Nakabo 2000:449 [ref. 25086], Shinohara et al. 2001:308 [ref. 25995], Nakabo 2002:449 [ref. 26001], Møller et al. 2016:Appendix A [ref. 34432] in Bythitidae). •Valid as Diplacanthopoma japonicum (Steindachner & Döderlein 1887) -- (Prokofiev 2022:681 [1020] [ref. 40458]). Current status: Valid as Diplacanthopoma japonicum (Steindachner & Döderlein 1887). Bythitidae. Distribution: Eastern Indian Ocean, western Pacific: Timor Sea; Japan. Habitat: marine.