Ameca splenens , the Butterfly Goodeid or Butterfly Splitfin, is a fish that was formerly found throughout the Rio Ameca drainage in Mexico, but today is extinct in the wild. For some time, it was a popular fish among aquarists, but unfortunately hobbyist stocks have declined quite a lot more recently. Possibly, it exists in a wild state again, but in the USA, where apparently-escaped or introduced individuals were met with in southeastern Nevada (Fuller, 2006). The type locality is Rio Teuchitlán in the vicinity of Teuchitlán, Jalisco.