Xiphorhynchus (subgenus of Hydrocyon) Agassiz [L.] in Spix & Agassiz 1829:76 Masc. Salmo falcatus Bloch 1794. Type by subsequent designation. Type designated by Jordan 1917:132 [ref. 2407]. Objectively invalid; preoccupied by Xiphorhynchus Swainson 1827 in Aves, replaced first by Xiphorhamphus Müller & Troschel 1845 (itself preoccupied) then by Acestrorhynchus Eigenmann & Kennedy 1903. For authorship and date see Kottelat 1988:78 [ref. 13380]. •In the synonymy of Acestrorhynchus Eigenmann & Kennedy 1903 -- (Taphorn 1992:99 [ref. 23654], Menezes in Reis et al. 2003:231 [ref. 27061]). 1°Homonym. Current status: Synonym of Acestrorhynchus Eigenmann & Kennedy 1903. Acestrorhynchidae: Acestrorhynchinae.