PHYLOGENY OF THE GENUS HEGETER (TENEBRIONIDAE, COLEOPTERA) AND ITS COLONIZATION OF THE CANARY ISLANDS DEDUCED FROM CYTOCHROME OXIDASE I MITOCHONDRIAL DNA SEQUENCES

摘要

The genus Hegeter comprises 23 species of darkling beetles (Tenebrionidae) endemic to the Macaronesian archipelagos, with 21 of them exclusive to the Canary Islands. We have sequenced 438 bp of the mitochondrial Cytochrome Oxidase I gene in 17 species (24 taxa) of Canarian Hegeter. Estimates of nucleotide composition, transition/transversion ratios and nucleotide change frequencies are very similar to those found in another tenebrionid Canarian genus Pimelia, indicating that similar molecular mechanisms are driving the sequence evolution. The sequence variation found allows phylogenetic analyses of the genus and the deduction of colonization patterns. These involve sequential island invasion with more rapid establishment and radiation than found in the related beetles of the genus Pimelia.