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any of more than a thousand species of small fish of the several families of the order Cyprinodontiformes (toothed minnows or toothed carps), a group that includes also the topminnows and many popular aquarium fishes (e.g.
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New World fish of the genus Poecilia, which includes the guppy or rainbow fish, Poecilia reticulata. Mollies, which are related to the killifishes, are found from the E and central United States to Argentina.
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(Lebistes reticulatus), a fish of the family Poeciliidae of the order Cyprinoidae. The males measure up to 4 cm long and the females, up to 6 cm. The coloration of the males is a combination of black, red, light blue, silver, and gold tones. The females are gray, sometimes gold. The guppy is found in the freshwaters of Venezuela, northern Brazil, Guiana, and the islands of Barbados and Trinidad. It is one of the most popular aquarium fish. A number of varieties have been bred which are larger and more brightly colored than the original form, with elongated caudal (trailing) or dorsal fins (scarf).