Butterfly Goodeid or Butterfly Splitfin, 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.
Red-tailed Black Sharks are known for their deep black color and the vividly colored tails. Their tail colors come in several colors with bright red and orange being the most common. When two Red-tailed Sharks are cohabitated together, they have been known to become territorial with one another.
