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- Title
Morphology and Development of the Immature Stages of Brachyufens osborni (Hymenoptera: Trichogrammatidae), an Egg Parasitoid of Broad-Nosed Weevil Species (Coleoptera: Curculionidae).
- Authors
JACAS, JOSEP-ANTON; PEÑA, JORGE E.; DUNCAN, RITA E.
- 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 aphotoperiod 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).
- Subjects
TRICHOGRAMMATIDAE; INSECT morphology; INSECT development; PARASITOIDS; BROAD-nosed grain weevil
- Publication
Annals of the Entomological Society of America, 2009, Vol 102, Issue 1, p112
- ISSN
0013-8746
- Publication type
Article
- DOI
10.1603/008.102.0112