Superfetation has also been clearly demonstrated and is normal for some species of poeciliid fishes. Alfaro is a genus of poeciliid fishes endemic to Central America. Priapichthys is a genus of poeciliid fishes native to Costa Rica, Panama and Colombia. The effect of inbreeding on reproductive behavior was studied in the poeciliid fish "Heterandria formosa". "Gambusia eurystoma" (a poeciliid from Mexico), and a few "Poecilia" (poeciliids from Mexico).