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      Two new species ofHymenoepimecis(Hymenoptera: Ichneumonidae: Pimplinae) with notes on their spider hosts and behaviour manipulation

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      Journal of Natural History
      Informa UK Limited

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          Spider manipulation by a wasp larva.

          W Eberhard (2000)
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            Phylogeny of the Polysphincta group of genera (Hymenoptera: Ichneumonidae; Pimplinae): a taxonomic revision of spider ectoparasitoids

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              Parasitoid-induced mortality of Araneus omnicolor (Araneae, Araneidae) by Hymenoepimecis sp. (Hymenoptera, Ichneumonidae) in southeastern Brazil.

              All species included in the Polysphincta genus-group develop as ectophagous parasitoids of active spiders, killing their hosts prior to pupation. However, little information regarding natural history and ovipositing behavior of most species are available. In this study we inspected 85 webs of Araneus omnicolor to evaluate the frequency of parasitism and host size preferences of the wasp Hymenoepimecis sp. We also described the web characteristics of normal and parasitized spiders and the wasp ovipositing behavior. About 41% of the adult females of A. omnicolor inspected were parasitized. The highest incidence of parasitism was observed among relatively small females while no egg or larva was found in large individuals. Araneus omnicolor builds a strong web composed of an orb and barrier threads, where the spider rests within a curled leaf. The parasitoid larva builds its cocoon within this refuge, and modified cocoon webs were not observed. The ovipositing behavior of Hymenoepimecis sp. was very similar to that of Hymenoepimecis argyraphaga parasitizing Leucauge argyra, including the position of the sting, the killing of a previously attached larva, and the expelling of the egg from the base of the ovipositor.
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                Author and article information

                Journal
                Journal of Natural History
                Journal of Natural History
                Informa UK Limited
                0022-2933
                1464-5262
                October 13 2009
                October 13 2009
                : 43
                : 43-44
                : 2691-2699
                Article
                10.1080/00222930903244010
                551f653a-e2dd-4810-a26e-f8d85f1632f0
                © 2009
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