Gambusia senilis
Gambusia senilis, the blotched gambusia, is a species of fish in the family Poeciliidae found in Mexico, where it is called guayacon pinto,  and formerly in the Devil's River in the Rio Grande basin in Texas. The Texas population was extirpated following the construction of the Amistad Dam. References

senilis
Fish described in 1859
Taxonomy articles created by Polbot