Lavinia is a genus of cyprinid fish consisting of one or two species native to western North America. While there is little doubt as to the membership of the hitch L. exilicauda, the position of the closely-related California roach is less clear. While FishBase records it as Hesperoleucus symmetricus, Moyle observes that hybrids of the two species are fertile, and that the genetic relationship is also close, and therefore Lavinia should take precedence. The origin of the genus name is the mythological Lavinia, although the rationale is unclear.
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