Considered a synonym of Gambusia affinis (Baird & Girard, 1853)
- 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)
Original description as Gambusia humilis:
- Girard, Charles Frederic. 1859. "Ichthyological notices". Proceedings of the Academy of Natural Sciences of Philadelphia. 11:113-122 (ffm04560)