pachyodus, Atopomesus Myers [G. S.] 1927:112 [Bulletin of the Museum of Comparative Zoology v. 68 (no. 3); ref. 3096] Cacuhy, Rio Negro, on the Colombian border, Brazil. Holotype (unique): CAS 41736 [ex IU 17673]. •Valid as Atopomesus pachyodus Myers 1927 -- (Malabarba 1998:231 [ref. 23844], Malabarba in Reis et al. 2003:113 [ref. 27061], Esguícero & Castro 2016:242 [ref. 34949], DoNascimiento et al. 2017:53 [ref. 35633]). Current status: Valid as Atopomesus pachyodus Myers 1927. Characidae: Characinae. Distribution: South America: western Amazon River basin, Brazil and Colombia. Habitat: freshwater.