The Silver Sailfin Lyretail Molly, is an aquarium strain of hybrid mollies. Parental species include Poecilia latipinna, Poecilia sphenops and possibly other molly species. The “sp.” designation indicates that this fish is a hybrid of unknown origin within the genus Poecilia and not a natural species. Males reach 12.5cm (5 in.). Females grow somewhat larger and much heavier. Both sexes have silver bodies and fins. Males frequently bear orange markings in the dorsal and body and turquoise markings in the caudal. The mature male’s dorsal fin is immense. Both sexes sport extensions, termed a “lyretail,” at the top and bottom of the caudal fins. This fish has no natural range since it is a hybrid among species that range from the Carolinas to Central America.