Andrew E. Carmichael, acarm001@student.ucr.edu, University of California - Riverside, Entomology, Entomology, Riverside, CA
In Eucharitini (Eucharitidae: Chalcidiodea), 23 genera use poneriform ants as their hosts. These genera are distributed primarily in the tropics, with only a limited number of species reaching into subtropical areas. Each geographic region has its own complement of endemic genera and only a few genera inhabit two or more regions. Using a combination of data from 28s-D2&D3, 18s, COII and morphology, the monophyly of this group was supported in both parsimony and Bayesian analyses. Additionally, three distinct clades within the parasitoids of poneriform ants were found. The Kapala clade consists of New World genera, while the Chalcura and Schizaspidia clades are comprised of Old World genera. In a total evidence parsimony analysis, the Schizaspidia clade was sister to the Kapala clade. Using Bayesian analyses, both the molecular and molecular + morphology datasets supported the Schizaspidia clade as sister to the Kapala clade. Using a relaxed molecular clock model, the divergence time for the separation of these three clades is around 35 mya to 25 mya. So while these parasitoids of poneriform ants display a classic Gondwanan distribution, the paraphyly of the Old World clades plus the recent divergence times of the genera suggests that their current distribution pattern is due to dispersal, rather than vicariance.
Species 1: Hymenoptera Eucharitidae
Kapala iridicolorSpecies 2: Hymenoptera Eucharitidae
Chalcura Species 3: Hymenoptera Eucharitidae
Ancylotropus Keywords: Parasitoid biogeography, Gondwana