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Free Content Genetic variation in three species of Caribbean periwinkles, Littorina angustior, L. lineolata, and L. ziczac (Gastropoda: Prosobranchia)

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The three species of the Littorina ziczac species-complex are genetically well separated in 3 and 4 out of 12 allozyme loci analyzed, while geographically separated populations of each species show a minor degree of genetic divergence. Thus, although the three species are morphologically very similar, there is no reason to doubt the species status of each. The allozyme characters of each species have a taxonomic value since they are diagnostic even in small or morphologically ambiguous specimens.

The total genetic variability is significantly higher within one of the three species, L. angustior, and this species also shows a deficiency in heterozygotes within two loci. Possible reasons for this are discussed.

Document Type: Research Article

Publication date: November 1, 1985

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