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Taxonomy
Guppies were first described in Venezuela as Poecilia reticulata by Wilhelm Peters in 1859 and as Lebistes poecilioides in Barbados by De Filippi in 1861. It was named Girardinus guppii by Albert Günther in honour of Robert John Lechmere Guppy, who sent specimens of the species from Trinidad to the Natural History Museum in London.[7] It was reclassified as Lebistes reticulatus by Regan in 1913. Then in 1963, Rosen and Bailey brought it back to its original name, Poecilia reticulata. While the taxonomy of the species was frequently changed and resulted in many synonyms, "guppy" remains the common name even as Girardinus guppii is now considered a junior synonym of Poecilia reticulata.[6]

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The guppy (Poecilia reticulata), also known as the millionfish or rainbow fish,[3] is a member of the family Poeciliidae and, akin to most New World members of the family, is considered a livebearer.[4] Male guppies, which are smaller than females, have ornamental caudal and dorsal fins. Wild guppies generally feed on a variety of food sources, including benthic algae and the larvae of aquatic insects.[5]

Originating from northeast South America, it has been introduced to many environments and are now found all over the world; guppies are now one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. They are highly adaptable and thrive in many different environmental and ecological conditions.[6] Guppies are used as a model organism in the fields of ecology, evolution, and behavioural studies.[6]

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