aenigmaticus, Icosteus Lockington [W. N.] 1880:63 [Proceedings of the United States National Museum v. 3 (no. 123); ref. 2817] San Francisco market, California, U.S.A. Syntypes: CAS (2), lost in 1906. See Mecklenburg 2003:2 [ref. 27304] for remarks on type specimens. •Valid as Icosteus aenigmaticus Lockington 1880 -- (Nakaya in Amaoka et al. 1983:149, 211 [ref. 8379], Eschmeyer & Herald 1983:283 [ref. 9277], Mochizuki in Masuda et al. 1984:309 [ref. 6441], Matarese et al. 1989:538 [ref. 26885], McAllister 1990:175 [ref. 14674], Kubota & Tsukada 1996:56 [ref. 24966], Nakabo 2000:1120 [ref. 25182], Sheiko & Fedorov 2000:39 [ref. 25650], Shinohara et al. 2001:330 [ref. 25995], Allen 2001:1 [ref. 26950], Mecklenburg et al. 2002:796 [ref. 25968], Nakabo 2002:1120 [ref. 26193], Okamoto et al. 2002:98 [ref. 26529], Mecklenburg 2003:2 [ref. 27304], Fedorov et al. 2003:130 [ref. 27579], Parin 2003:S24 [ref. 28536], Nelson et al. 2004:167 [ref. 27807], Love et al. 2005:158 [ref. 37547], Page et al. 2013:172 [ref. 32708], Parin et al. 2014:471 [ref. 33547], Pietsch & Orr 2015:65 [ref. 34694], Kells et al. 2016:300 [ref. 35888], Burton & Lea 2019:90 [ref. 37205], Love et al. 2021:201 [ref. 39279]). Current status: Valid as Icosteus aenigmaticus Lockington 1880. Icosteidae. Distribution: North Pacific: Honshu (Japan) and Sea of Okhotsk north to Bering Sea, then Gulf of Alaska (U.S.A.) south to southern California (U.S.A.). Habitat: marine.