Acestrocephalus Eigenmann [C. H.] 1910:447 Masc. Xiphorhamphus anomalus Steindachner 1880. Type by original designation (also monotypic). •Synonym of Cynopotamus Valenciennes 1849, but a valid subgenus Acestrocephalus -- (Géry 1977:307 [ref. 1597]). •Valid as Acestrocephalus Eigenmann 1910 -- (Menezes 1976:37 [ref. 7073] in subfamily Cynopotaminae, Menezes 1977 [ref. 7070], Taphorn 1992:39 [ref. 23654], Lasso & Taphorn 2000:443 [ref. 25255], Menezes 2006:386 [ref. 28897] dated 1909, Mirande 2009:7 [ref. 30267] in Characidae, Characinae, Mirande 2010:490 [ref. 31006], Oliveira et al. 2011:15 [ref. 31685], Melo et al. 2024:16 [ref. 41541] in Characinae). Current status: Valid as Acestrocephalus Eigenmann 1910. Characidae: Characinae.