guianensis, Brachychalcinus Boeseman [M.] 1952:303 [Zoologische Mededeelingen (Leiden) v. 31 (no. 26); ref. 12683] Itabu Creek, New River drainage, Guyana. Lectotype: FMNH 51535. Paralectotypes: FMNH 59525 (8, now 5); RMNH 18473 (1), 23430 [ex FMNH 59525] (2). Type catalog: Ibarra & Stewart 1987:17 [ref. 12367]. Lectotype selected by Böhlke 1958:81 [ref. 12050]. •Valid as Brachychalcinus guianensis Boeseman 1952 -- (Ortega & Vari 1986:7 [ref. 9708]). •Synonym of Brachychalcinus orbicularis (Valenciennes 1850) -- (Reis 1989:60 [ref. 14219], Chang & Ortega 1995:7 [ref. 24302], Reis in Reis et al. 2003:209 [ref. 27061]). Current status: Synonym of Brachychalcinus orbicularis (Valenciennes 1850). Characidae: Stethaprioninae. Habitat: freshwater.