diacanthus, Oplopomus Schultz [L. P.] 1943:242, Fig. 21 [Bulletin of the United States National Museum No. 180; ref. 3957] Lagoon of Canton Island, Phoenix Islands. Holotype (unique): USNM 116116. •Valid as Opua diacanthus (Schultz 1943) -- (Hutchins 2001:43 [ref. 25847], Hoese & Larson 2006:1668 [ref. 29097]). •Synonym of Oplopomops atherinoides (Peters 1855) -- (Randall 2005:542 [ref. 28239]). •Valid as Hazeus diacanthus (Schultz 1943) -- (Allen & Adrim 2003:59 [ref. 26830], Allen et al. 2024:2 [ref. 41004]). •Valid as Oplopomops diacanthus (Schultz 1943) -- (Iwata et al. 1998:117 [ref. 23379], Anderson et al. 1998:27 [ref. 23611], Myers 1999:243 [ref. 23965], Nakabo 2000:1195 [ref. 25182], Larson & Murdy 2001:3598 [ref. 26293], Nakabo 2002:1195 [ref. 26193], Myers & Donaldson 2003:643 [ref. 27495] in Oplopomus, Shibukawa et al. in Kimura & Matsuura 2003:187 [ref. 27510], Larson et al. 2008:150 [ref. 29532], Allen & Erdmann 2012:982 [ref. 31980], Prokofiev 2016:648 [ref. 35020], Parenti 2021:204 [ref. 38603], Larson 2022:103 [ref. 39971]). Current status: Valid as Oplopomops diacanthus (Schultz 1943). Gobiidae: Gobiinae. Distribution: Indo-West Pacific: Seychelles and Maldives east to Marshall Islands and Phoenix Islands (Kiribati), north to Ryukyu Islands (Japan), south to northern Australia. Habitat: marine.