Phylogenetic relationships of the italian populations of horseshoe whip snake hemorrhois hippocrepis (Serpentes, colubridae)

Abstract

Hemorrhois hippocrepis is a colubrid snake with a West Mediterranean distribution. It is widespread in the Iberian Peninsula and Northwest Africa. The only Italian populations are found on the islands of Sardinia and Pantel-leria. The phylogenetic relationships of these insular populations have been analysed for the first time on the basis of the mitochondrial DNA cytochrome b gene. The sequences were compared with those available from the geographic range of this species. The analyses showed that the Italian samples are part of a lineage that groups Tunisian and East Algerian samples, with which they share the same haplotype. These results strongly support the hypothesis of a recent origin of the Italian populations of Hemorrhois hippocrepis, probably determined by human-mediated dispersal from North Africa.