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1 January 2009 Morphology and Development of the Immature Stages of Brachyufens Osborni (Hymenoptera: Trichogrammatidae), an Egg Parasitoid of Broad-Nosed Weevil Species (Coleoptera: Curculionidae)
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Abstract

The external morphology and development of the immature stages of Brachyufens osborni (Dozier) (Hymenoptera: Trichogrammatidae), a Nearctic solitary endoparasitoid of the eggs of Pachnaeus spp. (Coleoptera: Curculionidae), are reported. Under our laboratory conditions (25°C and a photoperiod of 12:12 [L:D] h), B. osborni reared in eggs of Pachnaeus litus (Germar) (Entiminae) had a developmental time of 14.7 d. Egg hatching occurred within 15 h from oviposition and mandible measurements indicated the existence of two instars. First instars were mymariform, whereas second instars were sacciform. Pupation occurred 5–6 d after egg hatching and adults emerged 8 d later. On completion of the preimaginal development, the meconium was expelled and emergence took place by biting a hole in the chorion of the host egg. Both sexes emerged at the same time, and the sex ratio was female biased (3:1).

© 2009 Entomological Society of America
Josep-Anton Jacas, Jorge E. Peña, and Rita E. Duncan "Morphology and Development of the Immature Stages of Brachyufens Osborni (Hymenoptera: Trichogrammatidae), an Egg Parasitoid of Broad-Nosed Weevil Species (Coleoptera: Curculionidae)," Annals of the Entomological Society of America 102(1), 112-118, (1 January 2009). https://doi.org/10.1603/008.102.0112
Received: 28 January 2008; Accepted: 1 September 2008; Published: 1 January 2009
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