mutator, Astyanax Eigenmann [C. H.] 1909:18 [Annals of the Carnegie Museum v. 6 (no. 1); ref. 1222] Savannah Landing, Upper Potaro River, Guyana (?). Holotype: FMNH 52688 [ex CM 1023]. Paratypes: (120, CM and IU) BMNH 1911.10.31.328-332 (5); CAS 39348 [ex IU 11724] (25); FMNH 7455 (5), 52689 (26), 69540 (30); NMW 62782 (2); USNM 66108 (5); ZMA 101027 (1). Type catalog: Henn 1928:61 [ref. 12305], Nijssen et al. 1982:14 [ref. 19236], Ibarra & Stewart 1987:13 [ref. 12367], Vari & Howe 1991:7 [ref. 19022]. •Valid as Astyanax mutator Eigenmann 1909 -- (Buckup in Reis et al. 2003:111 [ref. 27061]). •Synonym of Astyanax scabripinnis (Jenyns 1842), but a valid subspecies -- (Triques et al. 2003:149 [ref. 27248]). •Valid as Deuterodon mutator (Eigenmann 1909) -- (Terán et al. 2020:7 [ref. 37440], Taphorn et al. 2022:14 [ref. 41297]). Current status: Valid as Deuterodon mutator (Eigenmann 1909). Acestrorhamphidae: Stygichthyinae. Distribution: South America: Guyana endemic. Habitat: freshwater.