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The Biogeography of the Genus Dugesia (Turbellaria, Tricladida, Paludicola) in the Mediterranean Region

Elizabeth J. de Vries
Journal of Biogeography
Vol. 12, No. 6 (Nov., 1985), pp. 509-518
Published by: Wiley
DOI: 10.2307/2844906
Stable URL: http://www.jstor.org/stable/2844906
Page Count: 10
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The Biogeography of the Genus Dugesia (Turbellaria, Tricladida, Paludicola) in the Mediterranean Region
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Abstract

The relationship between historical geology and the distribution of the species of the genus Dugesia in the Mediterranean is discussed. It is argued that the high number of disjunct distribution patterns in the western Mediterranean is correlated with the sequence of break-up of the microplates, whereas the high level of endemism found in the eastern mediterranean indicates a former distribution over a landmass, leading to endemism after the fragmentation of that landmass. The data suggest that later interconnections between the islands have not been of major importance for the distribution of the triclads. Furthermore, the implications for the phylogenetic analysis of the closely related species of the subgenus Dugesia are discussed. The distributional data of the genus Dugesia are compared with those of another Mediterranean taxon.

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