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Poecilia sphenops, called the Mexican molly or simply the molly, is a species of poeciliid fish from Central America. It was once understood as a widespread species with numerous local variants ranging from Mexico to Venezuela, but these variants are today considered distinct species belonging to the P. sphenops complex and P. sphenops itself as being native to Mexico, Guatemala, and Honduras.
Amazon mollies have a small dorsal fin consisting of 10-12 soft rays. [9] The position of the dorsal fin on the back of the fish is anterior, closer towards the head, than the position of the anal fin on the underside of the fish. They do not have any spiny rays on their fins. [10]
Gold mollies are yellow-gold like albino mollies but have dark eyes and occasionally scales edged in red. [3] Silver mollies have had all pigments but silver eliminated through selective breeding. [3] Chocolate mollies exhibit brown rather than black coloration. [3] In addition to the colors, fancy mollies differ in the shape of their fins. [3]
Sailfin mollies produce broods of 10–140 live young, depending on maturity and size, and females may store sperm long after the demise of their relatively short-lived mates. The gestation period for this species is about three to four weeks, depending upon temperature, and a single female may give birth on multiple occasions throughout the year.
According to the two morticians, who prepared Marilyn for burial, the legendary sex symbol had hairy legs, false teeth, and purple blotches all over her face when she was found dead aged 36 in 1962.
The most commonly kept species are guppies (P. reticulata), mollies (P. sphenops or P. latipinna), and Endler's livebearers . Members of the genus readily hybridize with each other and so most commercially offered fish are hybrids (with guppies having some Endler, and mollies being a mix of common and sailfin mollies).
Like other Poecilia, they are prone to hybridization with their relatives. Not infrequently, crosses are attempted with the sailfin molly to breed a hardier fish. This is generally not very successful, and should not be attempted, as purebred Yucatan mollies are often quite hard to find, and hybrids will not have as massive dorsal fins as these.
However, the green sunfish generally has a greenish-blue vermiculate pattern on its cheeks, [9] a black spot near the base of the dorsal and anal fins, [7] fins that are bordered in yellowish-white [9] and no teeth on the tongue. [6] [9] The rock bass has five or six spines in its anal fin as opposed to the three in the warmouth. [6]