brevior, Chasmocranus Eigenmann [C. H.] 1912:162, Pl. 15 (fig. 1) [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Warratuk, Guyana. Holotype: FMNH 53213 [ex CM 1662]. Paratypes: (2) ?BMNH 1911.10.31.64 (1), CAS 59692 [ex IU 12047] (1). Additional material (questionably referred): [CM 1663a] (1). Type catalog: Henn 1928:75 [ref. 12305], Ibarra & Stewart 1987:22 [ref. 12367], Ferraris 2007:182 [ref. 29155]. Appeared first as Chasmocephalus brevior, name only with locality, in Eigenmann 1910:384 [ref. 1224]. •Valid as Heptapterus brevior (Eigenmann 1912) -- (Mees 1986:321 [ref. 5693], Burgess 1989:276 [ref. 12860], Le Bail et al. 2000:122 [ref. 24549]). •Valid as Chasmocranus brevior Eigenmann 1912 -- (Bockmann & Guazzelli in Reis et al. 2003:412 [ref. 27061], Ferraris 2007:182 [ref. 29155], Brosse et al. 2019:134 [ref. 38320], Borstein et al. 2022:18 [ref. 39507], Taphorn et al. 2022:48 [ref. 41297]). Current status: Valid as Chasmocranus brevior Eigenmann 1912. Heptapteridae: Heptapterinae. Distribution: South America: Mana and Marowijne/Maroni River basins and Potaro River (French Guiana, Guyana and Suriname). Habitat: freshwater.