Ameca splendens, a bony fish from the monotypic genus Ameca of the splitfin family, is commonly known as the Butterfly Goodeid or Butterfly Splitfin. It was formerly found throughout the Ameca River drainage in Mexico; the type locality is Rio Teuchitlán in the vicinity of Teuchitlán, Jalisco. The species was only ever found in an area about 10 miles (15 km) in diameter.