callops, Microschemobrycon Böhlke [J. E.] 1953:846, Pl. 20 (fig. 2) [Annals and Magazine of Natural History (Series 12) v. 6 (no. 71) (art. 85); ref. 12366] Camanaos Rapids, Rio Negro, Brazil, about 0°10'S, 66°55'W. Holotype: CAS-SU 17491. Paratypes: ANSP 131519 [ex CAS-SU 17492] (1, c&s); CAS 20691 (2); CAS-SU 17492 (orig. 2), 17493-96 (1, 5, 1, 2). Type catalog: Böhlke 1984:44 [ref. 13621]. •Valid as Microschemobrycon callops Böhlke 1953 -- (Malabarba in Reis et al. 2003:145 [ref. 27061], DoNascimiento et al. 2017:53 [ref. 35633], Marinho 2024:219 [ref. 40817], Taphorn et al. 2022:17 [ref. 41297]). Current status: Valid as Microschemobrycon callops Böhlke 1953. Characidae: Characinae. Distribution: South America: Orinoco, Negro and Madeira River basins (Brazil, Colombia, Guyana and Venezuela). Habitat: freshwater.