Antennal sensilla of two parasitoid wasps: A comparative scanning electron microscopy study

M.A.K. Bleeker, H.M. Smid, A. van Aelst, J.J.A. van Loon, L.E.M. Vet

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    Abstract

    Two closely related parasitoid wasp species, Cotesia glomerata (L.) and Cotesia rubecula (Marshall) (Hymenoptera:Braconidae), are different in their associative learning of plant odors. To provide a solid basis for our research on the mechanisms that underlie this difference, we described the morphology of the antennal sensilla of these two species using scanning electron microscopy complemented with transmission electron microscopy. Female and male antennae of both species have the same six types of sensilla. We classified these sensilla as sensilla trichodea without pores, sensilla trichodea with a tip pore, sensilla trichodea with wall pores, sensilla coeloconica type I, sensilla coeloconica type II, and sensilla placodea. We conclude that the morphology, numbers, and distribution of the sensory receptors are highly similar in these two closely related wasp species. Differences between species and sexes occurred only in sensilla placodea numbers. C. rubecula has more sensilla placodea than C. glomerata and males of both species have a larger number and a higher density of sensilla placodea compared to females of the same species. [KEYWORDS: Cotesia glomerata, Cotesia rubecula, insect, SEM, TEM]
    Original languageEnglish
    Pages (from-to)266-273
    JournalMicroscopy Research and Technique
    Volume63
    Issue number5
    DOIs
    Publication statusPublished - 2004

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