The Marble Lyretail Sailfin Molly is an aquarium strain of hybrid mollies. Parental species include Poecilia latipinna, P. velifera and possibly other molly species. 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. Male marble lyretail sailfin mollies have gray-lavender bodies with many irregular black blotches, the “marbling”. Often, the head and front of the body are orange. The caudal (tail) is orange and sky blue. Some males have bluish flanks instead of the normal gray-lavender base color. The male’s dorsal is immense and has rows of black bars and an orange margin. Females have gray-green bodies with black marbling. Both sexes sport a lyretail. This fish has no natural range since it is a hybrid among species that range from the Carolinas to Central America.