flabellicauda, Rivulus Regan [C. T.] 1907:64 [Annals and Magazine of Natural History (Series 7) v. 19 (no. 109) (art. 6); ref. 15174] Juan Veñas, Costa Rica, elevation 1100 meters. Holotype (unique): BMNH 1907.6.28.37. •Synonym of Rivulus isthmensis Garman 1895 -- (Bussing 1980:330 [ref. 8732], Huber 1992:199 [ref. 20639]). •Synonym of Rivulus isthmensis Garman 1895, subspecies isthmensis Garman 1895 -- (Lazara 2001:277 [ref. 25711]). •Synonym of Cynodonichthys isthmensis (Garman 1895). Current status: Synonym of Cynodonichthys isthmensis (Garman 1895). Rivulidae: Rivulinae. Habitat: freshwater.