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Description and phylogenetic relationships of two new species of Baripus (Coleoptera: Carabidae: Broscini) and considerations regarding patterns of speciation
Ist Teil von
Annals of the Carnegie Museum, 2008-07, Vol.77 (1), p.211-227
Ort / Verlag
ANNALS OF CARNEGIE MUSEUM
Erscheinungsjahr
2008
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Baripus Dejean is a genus of the family Carabidae restricted to southern South America. Three subgenera are recognized within the genus; one of them, Cardiophthalmus Curtis, is endemic to the Patagonian Steppe. Together with the members of the genus Cnemalobus Guérin-Méneville, these beetles are the largest Carabidae of the Patagonian Steppe. New studies in the northern region of Patagonia, the Payunia, reveal the presence of two new species, Baripus (Cardiophthalmus) nevado, new species, and Baripus (Cardiophthalmus) precordillera, new species, restricted to isolated montane habitats. In this paper, we provide morphological descriptions of the new taxa with illustrations of male and female genitalia. We also conducted a phylogenetic analysis including all known species of Baripus. The cladistic analysis showed that B. (C.) mendozensis, B. (C.) nevado and B. (C.) precordillera constitutes a monophyletic group of species. These three species are allopatric, but B. (C.) mendozensis and B. (C.) nevado ranges are in close proximity. The distribution pattern, together with the phylogenetic pattern, suggests a possible peripatric pattern of speciation. We used a predictive model of species distribution to establish the present, past, and future distribution of B. (C.) mendozensis which is the most widely distributed species. Based on these analyses, we speculate that the current pattern of speciation may be a result of climatic changes during the Pleistocene.