Abstract: Notes on taxonomy, distribution, natural history, conservation and captive maintenance.
ZooBank:2BB33346-A4CD-4FE8-B06D-21F4E6DD50F1.
Original description as Xiphophorus pygmaeus nigrensis:
Rosen, Donn E. 1960. "Middle-American poeciliid fishes of the genus Xiphophorus". Bulletin of the Florida State Museum, Biological Sciences. 5(4):57-242 - [abstract] · (ffm00047)