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A COMPARISON OF THE SENSORY MORPHOLOGY OF THE CEPHALIC REGION OF FIRST- AND THIRD-INSTAR ARACHNIDOMYIA ALDRICHI (PARKER) (DIPTERA: SARCOPHAGIDAE)

Published online by Cambridge University Press:  31 May 2012

J.M. Schmidt
J.M. Schmidt
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

The sensory structures of the cephalic segment of first- and third-instar Arachnidomyia aldrichi (Parker) (Diptera: Sarcophagidae) larvae were examined by scanning electron microscopy. Larvae were prepared by methanol freeze substitution, which effectively preserved the structure of these membranous specimens. Sensilla of first and third instars are described and compared with respect to differences in the sensory requirements of these instars. Sensilla numbers and types were similar in both instars, although the sensilla of third instars were larger than those of first instars. None of the external sensory structures was unique to one or the other instar. The cephalic sensory structures of A. aldrichi are also similar in arrangement and structure to those reported for other saprophagous and herbivorous muscomorph dipteran larvae.

Résumé

Les structures sensorielles du segment céphalique ont été examinées au microscope électronique à balayage chez les larves de premier et de troisième stades d’Arachnidomyia aldrichi (Parker) (Diptera : Sarcophagidae). Les larves ont été préparées par gel et substitution de méthanol, méthode qui a permis de préserver la structure de ces animaux membraneux. On trouvera ici la description des sensilles des larves de premier et de troisième stades, ainsi qu’une comparaison de ces sensilles en relation avec les besoins sensoriels différents de ces deux stades. Les sensilles sont du même type et leur nombre est semblable chez les larves des deux stades, mais les sensilles des larves de troisième stades sont de taille plus grande. Aucun des récepteurs sensoriels externes n’était particulier à l’un ou l’autre stade. Les récepteurs sensoriels céphaliques d’A. aldrichi sont également semblables par leur disposition et leur structure aux sensilles d’autres larves de diptères muscomorphes saprophages et herbivores.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 125 , Issue 1 , February 1993 , pp. 101 - 111
Copyright
Copyright © Entomological Society of Canada 1993

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