Analyse phylogénétique et paraphylie des Coprini et Dichotomiini (Coleoptera : Scarabaeidae). Scénario biogéographique

Abstract

Phylogenetic analysis and paraphyly of Coprini and Dichotomiini (Coleoptera : Scarabaeidae). Biogeographic scenario. - We make use of a cladistic study to establish the phylogenetic relationships between 27 genera of Coprini and Dichotomiini. The paraphyly of both tribes appears clear and two new monophyletic groups can be defined : Coprini, stat. n. and Ateuchini, stat. n. The main characters to separate these new tribes are the shape of apex of protibiae, the shape of anterior part of propleura and the end of median ridge of under side of protibiae. Then, in reference to this phylogeny, a biogeographic scenario is built. For the typical Gondwanian group Ateuchini, the fragmentation of Gondwana is hypothetized as the main event to explain the current distribution of this group. For the Coprini, the last stages of the fragmentation of Gondwana and secondary migrations are considered.