Abstract
ABSTRACT The first phylogenetic analysis of the genera Passipassalus and Paxillus is presented. We studied all species of these two genera, including Passipassalus nukak sp. nov., Paxillus amati sp. nov., Paxillus inca sp. nov., Paxillus martinezi sp. nov., and Paxillus akatanga sp. nov. A morphological matrix with 40 characters was analyzed employing maximum parsimony. Nine species from other genera of Passalini (Ameripassalus, Passalus, Spasalus, and Ptichopus) were included. A single most-parsimonious tree was found with three polytomies caused by collapsing zero-length branches. Two species of Paxillus were grouped with Passipassalus buhrnheimi Fonseca and Reyes-Castillo (Passipassalus macrocerus (Reyes-Castillo and Fonseca) n. comb. and Passipassalus corniculatus (Fonseca, Gouveia and Fernandez) n. comb.). The remaining species of Paxillus constitute a monophyletic group divided in two clades that we called the Leachi and Forsteri species groups. The transfer of two species from Paxillus to Passipass...
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