Considerado un sinónimo menor de Poeciliopsis turrubarensis (Meek, 1912)
- Rosen, Donn E & R.M. Bailey. 1963. "The poeciliid fishes (Cyprinodontiformes), their structure, zoogeography, and systematics". Bulletin of the American Museum of Natural History. 126(1):1-176 (ffm04566)
Descripción original como Priapichthys fosteri:
- Hildebrand, Samuel Frederick. 1925. "Fishes of the Republic of El Salvador, Central America". Bulletin of the United States Bureau of Fisheries. 237-287 (ffm01157)