Abstract
Ants in the genus Dinoponera (Hymenoptera: Formicidae: Ponerinae) are among the largest sized Formicidae of the World. In Brazil Dinoponera has an allopatric distribution, and several species occur in threatened biomes. We characterized karyotypes of the following 4 species: Dinoponera australis Emery, Dinoponera gigantea Perty, Dinoponera lucida Emery, and Dinoponera quadriceps Santschi. Karyotype analysis found that all 4 species have high numbers of small-sized chromosomes (D. australis, 2n = 114; D. gigantea, 2n = 82; D. lucida, 2n = 118/120; D. quadriceps, 2n = 92). A moderate variation in chromosome number was observed among the 4 species, which suggests the occurrence of chromosome rearrangements during karyotype evolution in Dinoponera. An exclusive AMT chromosome pair was found to occur in all Dinoponera species studied thus far, which we conclude is a probable synapomorphy in Dinoponera.
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