Species that contain: Acestrorhynchus and microlepis [ 4 ] records

apurensis, Acestrorhynchus Toledo-Piza [M.] & Menezes [N. A.] 1996:18, Fig. 10 [American Museum Novitates No. 3160; ref. 22056] Módulo de la Unellez, Estado Apure, Venezuela. Holotype: MZUSP 48373. Paratypes: MCNG 11323 (11), MZUSP 37269 (4), TNHC 14872 (4). •Valid as Acestrorhynchus apurensis Toledo-Piza & Menezes 1996 -- (Menezes in Reis et al. 2003:231 [ref. 27061]). •Synonym of Acestrorhynchus microlepis (Jardine 1841) -- (López-Fernández & Winemiller 2003:195 [ref. 27386], Toledo-Piza 2007:693, 754 [ref. 29426]). Current status: Synonym of Acestrorhynchus microlepis (Jardine 1841). Acestrorhynchidae: Acestrorhynchinae. Habitat: freshwater.

cachorro, Acestrorhynchus Fowler [H. W.] 1940:274, Fig. 61 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 91 (for 1939); ref. 1432] Boca Chica, Río Ucayali basin, Peru. Holotype (unique): ANSP 68679. Type catalog: Böhlke 1984:44 [ref. 13621]. •Synonym of Acestrorhynchus microlepis (Jardine 1841) -- (Taphorn 1992:104 [ref. 23654], Toledo-Piza & Menezes 1996:4 [ref. 22056], Menezes in Reis et al. 2003:232 [ref. 27061], López-Fernández & Winemiller 2003:195 [ref. 27386]). Current status: Synonym of Acestrorhynchus microlepis (Jardine 1841). Acestrorhynchidae: Acestrorhynchinae. Habitat: freshwater.

guianensis, Acestrorhynchus Menezes [N. A.] 1969:70, 120, Fig. 54 [Arquivos de Zoologia (São Paulo) v. 18 (nos 1-2); ref. 7834] Botanic Garden, trenches in Georgetown with water form the Demerara River, Guyana. Holotype: FMNH 74359. Paratypes: (21) FMNH 53495 (2), 53501-02 (2, 1), 53504 (2); MCZ 20517 (9), 45275 (1 c&s), 45276-77 (2); USNM 194148 (1). Type catalog: Ibarra & Stewart 1987:5 [ref. 12367]. •Valid as Acestrorhynchus guianensis Menezes 1969 -- (Menezes & Géry 1983:590 [ref. 8307], Géry et al. 1991:42 [ref. 21021], Planquette et al. 1996:224 [ref. 22818]). •See Taphorn 1992:104 [ref. 23654]. •Synonym of Acestrorhynchus microlepis (Jardine 1841) -- (Toledo-Piza & Menezes 1996:4 [ref. 22056], Menezes in Reis et al. 2003:232 [ref. 27061], López-Fernández & Winemiller 2003:195 [ref. 27386]). Current status: Synonym of Acestrorhynchus microlepis (Jardine 1841). Acestrorhynchidae: Acestrorhynchinae. Habitat: freshwater.

microlepis, Hydrocyon Jardine [W.] in Schomburgk 1841:247 [The Natural history of fishes of Guiana; ref. 18707] Rio Negro; Rio Branco; and Essiquibo River, South America. No types known. •Valid as Acestrorhynchus microlepis (Jardine 1841) -- (Menezes & Géry 1983:590 [ref. 8307], Ortega & Vari 1986:7 [ref. 9708], Taphorn 1992:104 [ref. 23654], Toledo-Piza & Menezes 1996:4 [ref. 22056], Lasso et al. 2001:95 [ref. 25928], Menezes in Reis et al. 2003:232 [ref. 27061], López-Fernández & Winemiller 2003:195 [ref. 27386], Toledo-Piza 2007:755 [ref. 29426], Barriga Salazar 2014:109 [ref. 35745], Sarmiento et al. 2014:183 [ref. 35004], DoNascimiento 2016:528 [ref. 34727] with author as Schomburgk, Melo et al. 2016:133 [ref. 34701], DoNascimiento et al. 2017:45 [ref. 35633] with author as Schomburgk, Urbano-Bonilla et al. 2018:83 [ref. 35773], Silvano et al. 2020:44 [ref. 38133], Meza-Vargas et al. 2021:15 [ref. 39298], Borstein et al. 2022:16 [ref. 39507], Cortés Hernández et al. 2023:455 [ref. 40760], Koerber et al. 2023:4 [ref. 40665]). Current status: Valid as Acestrorhynchus microlepis (Jardine 1841). Acestrorhynchidae: Acestrorhynchinae. Distribution: South America: Amazon and Orinoco River basins and rivers of northern South America (Brazil, Ecuador, Colombia, Bolivia, French Guiana, Guyana, Venezuela, Peru and Suriname). Habitat: freshwater.