Descripción original como Xiphophorus milleri:
ZooBank:7DB36150-1B7E-4951-90EA-7D90CE8241CF.
- 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)
Conservación: Xiphophorus milleri es evaluada por la Unión Internacional para la Conservación de la Naturaleza en la lista roja de especies amenazadas como (DD) datos deficientes (2018). Espinoza-Perez ([ref1=1059]) reports that at least in some areas of its range X. milleri is severely threatened by water pollution from agriculture and farming run-off, urban sewage and industrial discharges, increased sedimentation, eutrophication and coliform bacteria. I have observed (2021) X. milleri inhabiting some pristine habitats in streams in the eastern part of Lake Catemaco.