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Larval morphology and development of Aphidius rhopalosiphi (Hymenoptera : Braconidae : Aphidiinae)

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Muratori, Frédéric [UCL] Lannic, JL Nenon, JP Hance, Thierry [UCL]

The aphid parasitoid Aphidius rhopalosiphi is the most abundant species of Aphidiinae in cereal fields in northern Europe. Although the larval morphology of other Aphidiinae has been described, the morphology and immature development of A. rhopalosiphi remain unknown. Our goal is to relate growth and larval developmental stages to morphological changes during parasitoid development, using light and scanning electron microscopy. Aphidius rhopalosiphi develops through three larval stages with clear differences in the morphology of the mouthparts, tegument sculpturing, and respiratory features that can be related to the different constraints that the larvae have to face. In the first instar, adaptations to physical combat with competitors take the form of strong mandibles, active caudae, and dorsal spines that allow crawling motion. In the third instar,the larva is adapted to tear tissues with short hooked mandibles and to face aerial respiration. All instars possess sensory structures. The "three instars" hypothesis is supported here by the observation of larvae in exuviation. No differences were found between our observations and descriptions of other Aphidius species, supporting the idea that species of this genus cannot be distinguished by larval morphology but only by morphometric analysis. Son e new features of the genus are presented for the first and second instars.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2004
Language Anglais
Journal information "Canadian Entomologist" - Vol. 136, no. 2, p. 169-180 (2004)
Peer reviewed yes
Publisher Entomol Soc Canada (Ottawa)
issn 0008-347X
Publication status Publié
Affiliation UCL - SC/BIOL - Département de biologie
Links
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Bibliographic reference Muratori, Frédéric ; Lannic, JL ; Nenon, JP ; Hance, Thierry. Larval morphology and development of Aphidius rhopalosiphi (Hymenoptera : Braconidae : Aphidiinae). In: Canadian Entomologist, Vol. 136, no. 2, p. 169-180 (2004)
Permanent URL http://hdl.handle.net/2078.1/40268