Original description as Xiphophorus helleri alvarezi:
- Rosen, Donn E. 1960. "Middle-American poeciliid fishes of the genus Xiphophorus". Bulletin of the Florida State Museum, Biological Sciences. 5(4): 57-242 (ffm00047)
Conservation: Xiphophorus alvarezi is evaluated by the international union for the conservation of nature in the iucn red list of threatened species as (LC) least concern (2018).