protractila, Bivibranchia Eigenmann [C. H.] 1912:259, Pl. 33 (figs. 1-5) [Memoirs of the Carnegie Museum v. 5 (no. 1); ref. 1227] Bartica sand bank, Guyana. Holotype: FMNH 53576 [ex CM 1873]. Paratypes: (29, CM and IU) BMNH 1911.10.31.484 (1); CAS 39433 [ex IU 12158] (4), 39434 [ex IU 12159] (7), 39435 [ex IU 12243] (2); FMNH 7431 (1), 53404-05 (3, 3), 53577 (1); MCZ 30115 (1); NMW 62866 (1); USNM 66126 [ex CM] (1). Type catalog: Henn 1928:54 [ref. 12305], Böhlke 1953:22 [ref. 12291], Ibarra & Stewart 1987:16 [ref. 12367], Vari & Howe 1991:8 [ref. 19022]. •Valid as Bivibranchia protractila Eigenmann 1912 -- (Vari 1985:511 [ref. 5270]). •Synonym of Bivibranchia fowleri (Steindachner 1908) -- (Langeani in Reis et al. 2003:97 [ref. 27061]). Current status: Synonym of Bivibranchia fowleri (Steindachner 1908). Hemiodontidae. Habitat: freshwater.