monacanthus, Tetraroge Gilchrist [J. D. F.] 1906:145, Pl. 37 (bottom) [Marine Investigations in South Africa v. 4; ref. 1647] Off False Bluff, South Africa, depth 20 fathoms. Holotype: SAM 11865 (47 mm TL). Paratypes: (4) ?BMNH 1930.1.14.5 [ex SAM] (1), SAM (not found). •Valid as Cocotropus monacanthus (Gilchrist 1906) -- (Poss & Eschmeyer 1978:405 [ref. 6387], Poss 1986:480 [ref. 6296], Poss & Allen 1987:79 [ref. 6616], Imamura & Shinohara 2003:233 [ref. 27213], Fricke 2004:2 [ref. 27662], Johnson 2004:179 [ref. 27781], Prokofiev 2010:723 [ref. 31093], Matsunuma et al. 2021:Table 2 [ref. 38266], Poss 2022:560 [ref. 39726]). Current status: Valid as Cocotropus monacanthus (Gilchrist 1906). Synanceiidae: Aploactininae. Distribution: Western Indian Ocean: Aliwal Shoal (South Africa) north to Tanzania, east to Comoros. Habitat: marine.