The La Palma Pupfish was endemic to only one spring-fed pool of some 10 sq. metres in a Mexican desert. Discovered only in the early 1990s, it is now extinct in the wild (since 1996) following human drainage of the pool for irrigation but a small population survives in captivity.

The breeding male has beautiful milky white irridescent scales and a thick black border to the tail. They grow to 5-6cm long.

The female doesn't have the black border to the tail.

The Charco Palma Pupfish, also called the Charco Pupfish, is also now extinct in the wild following human drainage of its habitat but a small population survives in captivity.

It is superficially similar to the La Palma and Potosi pupfish, but with a bluer wash on the male.