placida, Tilapia Trewavas [E.] 1941:306 [Annals and Magazine of Natural History (Series 11) v. 7 (no. 39); ref. 12736] Idunda River, lower Buzi River, south of the Zambezi River, Portuguese East Africa. Holotype (unique): BMNH 1907.7.2.19. •Valid as Oreochromis placidus (Trewavas 1941), valid subspecies placidus (Trewavas 1941) -- (Trewavas 1981:42 [ref. 39520]). •Valid as Oreochromis placidus (Trewavas 1941) -- (Trewavas & Teugels 1991:335 [ref. 20954], Skelton 1993:328 [ref. 24071], Skelton 2001:328 [ref. 27406], Marshall 2011:251 [ref. 31755], Ford et al. 2019:223 [ref. 36713]). Current status: Valid as Oreochromis placidus (Trewavas 1941). Cichlidae: Pseudocrenilabrinae. Distribution: Southeastern Africa: Ruvuma River basin. Habitat: freshwater, brackish.