guianensis, Astyanax Eigenmann [C. H.] 1909:16 [Annals of the Carnegie Museum v. 6 (no. 1); ref. 1222] Warraputa, Guyana. Holotype: FMNH 53518 [ex CM 1013] [?51518]. Paratypes: (214, CM and IU) ANSP 39093 (1); BMNH 1911.10.31.314-318 and 319-320 (5 + 2); CAS 39208 [ex IU 11717 (26)/CAS-SU 21945 (6)] (32), 39209-11 [ex IU 11718-20] (1, 1, 10); FMNH 7452-53 (6, 2), 52682-83 (10, 1), 52862 (26); MCZ 29960-61 (xxx); NMW 58824 (4), 62783 (1); CAS-SU 21957 (2); USNM 66105-06 (5, 1), 120394 (2); ZMA 101028 (1), 101035 (3). Type catalog: Henn 1928:60 [ref. 12305], Böhlke 1953:22 [ref. 12291], Nijssen et al. 1982:14 [ref. 19236], Ibarra & Stewart 1987:12 [ref. 12367], Böhlke 1984:47 [ref. 13621], Vari & Howe 1991:6 [ref. 19022]. •Valid as Astyanax guianensis Eigenmann 1909 -- (Buckup in Reis et al. 2003:109 [ref. 27061], Garutti & Venere 2009:378 [ref. 30493], Marinho & Birindelli 2013:46 [ref. 32569], Marinho & Ohara 2013:476 [ref. 32713], Marinho et al. 2015:569 [ref. 33708], DoNascimiento et al. 2017:61 [ref. 35633]). •Valid as Makunaima guianensis (Eigenmann 1909) -- (Terán et al. 2020:7 [ref. 37440], Taphorn et al. 2022:17 [ref. 41297]). Current status: Valid as Makunaima guianensis (Eigenmann 1909). Acestrorhamphidae: Megalamphodinae. Distribution: South America: Essequibo, Orinoco and Amazon River basins (Guyana, Venezuela, Colombia, Brazil and Bolivia). Habitat: freshwater.