microphthalmus, Tetragonopterus Günther [A.] 1864:324 [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Rio Rímac, Peru; Lago de Amatitlán, Guatemala; Pacific coast of Guatemala. Syntypes: (9) BMNH 1863.2.3.8-12 (5) Rio Rimac, ?1864.1.26.349-350 (2) Panama or Guatemala, ?1865.4.29.43-44 (2) Lake Amatilán. Loality as Panama or Guatemala ('Pacific coast of Guatemala' according to Günther 1864:324 [ref. 1974], but 'Pacific coast of Panama' according to jar label and register entry). The Peru syntypes were reidentified as Bryconamericus peruanus (Müller & Troschel 1845) (J. Maclaine, personal communication, Aug. 2009). Lectotype designation is desirable. •Synonym of Astyanax fasciatus (Cuvier 1819) -- (Buckup in Reis et al. 2003:109 [ref. 27061] with question, Mirande & Koerber 2015:2 [ref. 33698] with question). •Synonym of Astyanax aeneus (Günther 1860) -- (Schmitter-Soto 2017:1352 [ref. 35414]). Current status: Synonym of Astyanax aeneus (Günther 1860). Characidae: Stethaprioninae. Habitat: freshwater.