japonicus, Pentaceros Steindachner [F.] 1883:124 [Anzeiger der Kaiserlichen Akademie der Wissenschaften, Wien, Mathematisch-Naturwissenschaftliche Classe v. 20 (no. 15) (for 14 June 1883); ref. 20490] Tokyo, Japan. Syntypes: NMW 82877 (1), 86123 (1). Species illustrated and described in more detail in Steindachner & Döderlein 1883:8, Pl. 5 (figs. 1-2) [ref. 4247]. •Valid as Pentaceros japonicus Steindachner 1883 -- (Mochizuki in Okamura et al. 1982:241, 384 [ref. 8256], Hardy 1983:203 [ref. 5385], Mochizuki in Masuda et al. 1984:189 [ref. 6441], Machida in Okamura et al. 1985:521, 694 [ref. 8056], Pequeño 1989:62 [ref. 14125], Nakabo 2000:908 [ref. 25182] with author as Döderlein, Laboute & Grandperrin 2000:495 [ref. 25191], Shinohara et al. 2001:327 [ref. 25995], Nakabo 2002:000 [ref. 26193] with author as Döderlein, Choi et al. 2003:355, 625 [ref. 26218] with author as Döderlein, Shinohara et al. 2005:436 [ref. 28370], Mundy 2005:408 [ref. 28379], Kim 2012:94 [ref. 32039], Shinohara et al. 2014:263 [ref. 33330], Koeda et al. 2016:61 [ref. 35333], Miyazaki et al. 2019:123 [ref. 37957], Kim et al. 2021:168 [ref. 39117], Koeda et al. 2021:6 [ref. 38857]). Current status: Valid as Pentaceros japonicus Steindachner 1883. Pentacerotidae: Pentacerotinae. Distribution: Northwestern Pacific: Ryukyu Islands north to central Japan, east to Ogasawara Islands and Hawaiian Ridge; southwestern Pacific: Chesterfield Islands (New Caledonia); southeastern Pacific: Nazca and Sala-y-Gomez ridges. Habitat: marine.