Abstract
A phylogenetic analysis of the Saxifraga-associated species of Dichotrachelus was carried out based on morphological and, for some species, molecular data. The various methods implemented gave congruent results and yielded a significantly supported phylogenetic inference of the relationships among the species. Saxifraga-associated species form a monophyletic unit, and some species-groups were evidenced, distributed in the eastern, central and western Alps, respectively. Based on the phylogenetic inference, and taking into account palaeogeological and palaeogeographical information, a biogeographic scenario of the events that may have led to the present-day distribution is proposed.
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