longior, Chasmocranus Eigenmann [C. H.] 1912:160, Fig. 33; Pl. 14 (fig. 2) [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Amatuk, Guyana. Holotype: FMNH 53208 [ex CM 1655]. Paratypes: (31, CM and IU) BMNH 1911.10.31.63 (1); CAS 63608 [ex IU 12043] (3), 63609 [ex IU 12044] (2); 63610 [ex IU 12045] (1); 63611 [ex IU 12046] (2); FMNH 7382 (1), 53209-11 (1, 1, 1), 53211 (1), 53564 (3); MCZ 30079 (1); CAS-SU 21929 (1); UMMZ 185337 [ex IU 12046] (1); USNM 66133 (1); ZMA 100992 (1). Type catalog: Henn 1928:76 [ref. 12305], Böhlke 1953:44 [ref. 12291], Nijssen et al. 1982:41 [ref. 19236], Ibarra & Stewart 1987:23 [ref. 12367], Ferraris & Vari 1992:33 [ref. 19771], Ferraris 2007:183 [ref. 29155]. Appeared first as Chasmocephalus longior, name only, in Eigenmann 1910:384 [ref. 1224]. •Valid as Heptapterus longior (Eigenmann 1912) -- (Mees 1986:321 [ref. 5693], Burgess 1989:276 [ref. 12860], Le Bail et al. 2000:124 [ref. 24549], Bockmann & Guazzelli in Reis et al. 2003:412 [ref. 27061], Ferraris 2007:183 [ref. 29155]). •Valid as Chasmocranus longior Eigenmann 1912 -- (Sarmiento et al. 2014:191 [ref. 35004], Brosse et al. 2019:134 [ref. 38320], Taphorn et al. 2022:48 [ref. 41297]). Current status: Valid as Chasmocranus longior Eigenmann 1912. Heptapteridae: Heptapterinae. Distribution: Widespread in northern South America: Brazil, Bolivia, Guyana, Suriname and Venezuela. Habitat: freshwater.