Also called the Short-Finned Molly, the Black Molly is named for its black coloration. In the wild, however, many specimens are a dull silver color, sprinkled with black. Males of the species may exhibit a pointed anal fin and a larger dorsal fin than females, while female Black Mollies have a rounded anal fin and can be identified by the gravid spot that forms on their bellies during pregnancy. Black Mollies can be found in parts of Columbia, Mexico and Venezuela, though some have also been found in the Caribbean islands. Most specimens available in the aquarium hobby are tank bred, most being produced in Eastern Europe or the Far East.