Descripción original como Xiphophorus pygmaeus:
ZooBank:7EA07A04-488D-4853-A1C1-EC49B65A595A.
- Hubbs, Carl Leavitt & M. Gordon. 1943. "Studies of cyprinodont fishes. XIX. Xiphophorus pygmaeus, new species from Mexico". Copeia. 1943(1):31-33 (ffm00064)
Conservación: Xiphophorus pygmaeus es evaluada por la Unión Internacional para la Conservación de la Naturaleza en la lista roja de especies amenazadas como (DD) datos deficientes (2018). Although the Huichihuayan and Axtla rivers carry enough flow and most areas remain in very good shape, with some remaining pristine areas, deforestation, pesticides, fertilizers and pollution (particularly around Huichihuayan) are common problems that affect them and have to be resolved, particularly in view of human population increase in the area.