retropinna, Poecilia Regan [C. T.] 1908:458 [Annals and Magazine of Natural History (Series 8) v. 2 (no. 11); ref. 3637] Boruca, Costa Rica. Holotype (unique): BMNH 1909.3.13.69. •Valid as Poeciliopsis retropinna (Regan 1908) -- (Rosen & Bailey 1963:139 [ref. 7067], Bussing 1987:150 [ref. 22927], Bussing 1998:227 [ref. 24179], Lucinda in Reis et al. 2003:571 [ref. 27061], Lucinda & Reis 2005:43 [ref. 29205], Angulo et al. 2013:997 [ref. 33194], Meyer 2015:301 [ref. 34698], Huber 2019:130 [ref. 36941], Angulo et al. 2020:6 [ref. 37425]). Current status: Valid as Poeciliopsis retropinna (Regan 1908). Poeciliidae: Poeciliinae. Distribution: Central America: Pacific slopes of Costa Rica and Panama. Habitat: freshwater.