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The immature stages and behavior of Pseudometagea schwarzii (Ashmead) (Hymenoptera: Eucharitidae: Eucharitini) are described, and the presence of an endoparasitic planidium that undergoes growth-feeding in the larva of the host ant (Lasius neoniger Emery) is confirmed. Bayesian inference and parsimony ancestral state reconstruction are used to map the evolution of endoparasitism across the eucharitid-perilampid clade. Endoparasitism is proposed to have evolved independently three times within Eucharitidae, including once in Pseudometagea Ashmead, and at least twice in Perilampus Latreille. Endoparasitism is independent as an evolutionary trait from other life history traits such as differences in growth and development of the first-instar larva, hypermetamorphic larval morphology, and other biological traits, including koinobiosis

journal of hymenoptera research/journal of hymenoptera research

The life history of Pseudometagea schwarzii, with a discussion of the evolution of endoparasitism and koinobiosis in Eucharitidae and Perilampidae (Chalcidoidea)