rhomboides, Holacanthus Gilchrist [J. D. F.] & Thompson [W. W.] 1908:161 [Annals of the South African Museum v. 6 (pt 2); ref. 14320] KwaZulu-Natal, South Africa.=, southwestern Indian Ocean. Holotype (unique): SAM 9905. Second specimen not regarded as a type. •Synonym of Pomacanthus striatus (Rüppell 1836) -- (Allen 1980:251 [ref. 22764], Smith & Heemstra 1986:626 [ref. 5714]). •Valid as Pomacanthus rhomboides (Gilchrist & Thompson 1908) -- (Randall 1988:3 [ref. 12862], Manilo & Bogorodsky 2003:S112 [ref. 27377], Heemstra & Heemstra 2004:282 [ref. 28072], Fricke et al. 2018:242 [ref. 35805], Heemstra 2022:441 [ref. 39850]). Current status: Valid as Pomacanthus rhomboides (Gilchrist & Thompson 1908). Pomacanthidae. Distribution: Western Indian Ocean: Western Cape, Eastern Cape and southern KwaZulu-Natal (South Africa) and Madagascar. Habitat: marine.