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Limia
''Limia'' is a genus of livebearing fishes belonging to the Cyprinodontiform family Poeciliidae, which includes other livebearers such as platys, swordtails (genus ''Xiphophorous''), guppies and mollies (genus ''Poecilia''). They are found in fresh and brackish water. Of the 21 described ''Limia'' species, 17 are endemic to Hispaniola, one is found on both Hispaniola and Jamaica, and the Cayman Islands, Cuba, and Venezuela have an endemic species each. Limias are popular in aquaria among more advanced hobbyists.
== Origin and evolution ==
Two schools of thought on the origin of the genus exist. The first suggests limias arose from colonization by a seawater-tolerant species that crossed over shallow waters from the North or South American mainland. The strongest evidence for this model is that of the approximately 60 species of freshwater fish in the Antilles, all of them are secondary division freshwater fish. This indicates the ancestors of all fish present on the islands at least had the ability to cross over shallow seas.
The second school of thought suggests freshwater fish in the Antilles are the descendants of mainland species that became isolated when some of the Greater Antilles split from the mainland. The virtual lack of freshwater fish fossils from the Antilles means this debate likely needs to be resolved through molecular evidence.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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