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Biology of the solitary wasp Trypoxylon (Trypargilum) agamemnon Richards 1934 (Hymenoptera: Crabronidae) in trap-nests

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Abstract

Buschini, M.L.T. and Fajardo, S. 2009. Biology of the solitary wasp Trypoxylon (Trypargilum) agamemnon Richards 1934 (Hymenoptera: Crabronidae) in trap-nests. —Acta Zoologica (Stockholm) 91: 426–432.

Some Trypoxylon species build their nests in preexisting tubular cavities like hollow stems and beetle borings in branches. Study of the biology of these insects is relatively easy because the females of these wasps nest with enormous success in trap-nests. The aim of this study was to investigate the abundance, seasonality and life-history of Trypoxylon agamemnon. For capture of these insects, trap-nests were installed in the Parque Municipal das Araucárias in araucaria forest, grassland and swamp, from December, 2001 to December, 2005. Two hundred and ninety seven nests were obtained. They were constructed more often during the summer (from December to April). The nests were built only in araucaria forest and consisted of a linear series of cells, divided by mud partitions, whose number varied from 1 to 7. Normally they have only one vestibular cell. The inner cells had been provisioned, usually with spiders of Anyphaenidae family. Sex-ratio was strongly female biased. Its main natural enemies included Chrysididae, Ichneumonidae and Tachinidae.
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Keywords: Crabronidae; Hymenoptera; Trypoxylon; biology; trap-nests

Document Type: Research Article

Publication date: 2010-10-01

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