minutus, Ammocryptocharax Buckup [P. A.] 1993:109, Fig. 4 [Ichthyological Exploration of Freshwaters v. 4 (no. 2); ref. 20831] Rio Urubaxi, beach near confluence with Rio Negro, Amazonas State, Brazil, 0°35'S, 64°45'W. Holotype: MZUSP 43671. Paratypes: ANSP 161673 (6, 2 c&s), 161674-77 (2, 2, 1, 1); MBUCV-V-6364 (1), V-7947 (1), V-8066 (1); MCNG 12416 (2 of 4); MZUSP 43672 (1); UMMZ 219580 (1); USNM 290012 (1). Type catalog: Oyakawa 1996:450 [ref. 23140], Provenzano et al. 1998:3 [ref. 24196]. •Valid as Ammocryptocharax minutus Buckup 1993 -- (Costa & Le Bail 1999:1028 [ref. 24187], Buckup in Reis et al. 2003:88 [ref. 27061], DoNascimiento et al. 2017:34 [ref. 35633], Meza-Vargas et al. 2021:20 [ref. 39298], Taphorn et al. 2022:20 [ref. 41297]). Current status: Valid as Ammocryptocharax minutus Buckup 1993. Crenuchidae: Characidiinae. Distribution: South America: upper Orinoco, Amazon, and upper Negro River basins (Brazil, Colombia, Guyana, Peru and Venezuela). Habitat: freshwater.