theta, Diaphus Eigenmann [C. H.] & Eigenmann [R. S.] 1890:4 [Proceedings of the California Academy of Sciences (Series 2) v. 3; ref. 1256] Off Point Loma, California, U.S.A.(from rockfish mouth). Lectotype: USNM 41914 (?1 of 2). Paralectotypes: (10) BMNH 1891.5.19.175-176 (2), CAS [old no.] 1003 (lost in 1906), MCZ 27392 (1), USNM 41922 (5). Lectotype selected by Nafpaktitis 1978:62 [ref. 8904]. •Valid as Diaphus theta Eigenmann & Eigenmann 1890 -- (Paxton 1979:7 [ref. 6440], Fujii in Masuda et al. 1984:72 [ref. 6441], Peden et al. 1985:6 [ref. 24081], Matarese et al. 1989:176 [ref. 26885], Pequeño 1989:37 [ref. 14125], McAllister 1990:105 [ref. 14674], Shinohara et al. 1994:70 [ref. 22800], Paxton et al. in Fischer et al. 1995:1320 [ref. 22830], Shinohara et al. 1996:165 [ref. 26605], De La Cruz Agüero et al. 1997:232 [ref. 24545], Nakabo 2000:395 [ref. 25086], Sheiko & Fedorov 2000:22 [ref. 25650], Mecklenburg et al. 2002:252 [ref. 25968], Moku et al. 2001:385 [ref. 25793], Nakabo 2002:395 [ref. 26001], Fedorov et al. 2003:46 [ref. 27579], Nelson et al. 2004:88 [ref. 27807], Love et al. 2005:44 [ref. 37547], Mundy 2005:219 [ref. 28379], Page et al. 2013:90 [ref. 32708], Parin et al. 2014:156 [ref. 33547], Pietsch & Orr 2015:24 [ref. 34694], Kells et al. 2016:106 [ref. 35888], Burton & Lea 2019:46 [ref. 37205], Carneiro et al. 2019:118 [ref. 37250], Balushkin & Prirodina 2020:55 [ref. 37828], Love et al. 2021:67 [ref. 39279], Grove et al. 2022:17 [ref. 41326], Prokofiev et al. 2022:11 [ref. 38957], Page et al. 2023:95 [ref. 40505], Meera et al. 2024:4 [ref. 41339]). Current status: Valid as Diaphus theta Eigenmann & Eigenmann 1890. Myctophidae: Diaphinae. Distribution: Pacific: Japan north to Bering Sea, then south to Hawaiian Islands (U.S.A.) and Chile, including Galapagos Islands (Ecuador). Records from Western Indian Ocean need verification. Habitat: marine.