waimacui, Rivulus Eigenmann [C. H.] 1909:50 [Annals of the Carnegie Museum v. 6 (no. 1); ref. 1222] Shrimp Creek, Potaro River basin, Guyana. Holotype: FMNH 53536 [ex CM 1078]. Paratypes: (14, CM and IU) BMNH 1911.10.31.534-535 (2); CAS 76312 [ex IU 11760] (5); FMNH 7520 (1), 52712-14 (2, 1, 1); MCZ 29992 (1); ZMB 18060 (1). Type catalog: Henn 1928:86 [ref. 12305], Paepke & Seegers 1986:169 [ref. 19981], Ibarra & Stewart 1987:76 [ref. 1236]. •Valid as Rivulus waimacui Eigenmann 1909 -- (Huber 1992:451 [ref. 20639], Huber 1999:49 [ref. 23834], Lazara 2001:286 [ref. 25711], Costa in Reis et al. 2003:540 [ref. 27061], Suijker & Collier 2006:2 [ref. 28729], Costa 2006:139 [ref. 28875] in subgenus Cynodonichthys, Costa & De Luca 2011:356 [ref. 31193]). •Valid as Anablepsoides waimacui (Eigenmann 1909) -- (Costa 2011:243 [ref. 31655], Valdesalici 2015:247 [ref. 34049], Taphorn et al. 2022:36 [ref. 41297]). Current status: Valid as Anablepsoides waimacui (Eigenmann 1909). Rivulidae: Rivulinae. Distribution: South America: Potaro River basin (Guyana) endemic. Habitat: freshwater.