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THE STRUCTURE AND FUNCTION OF THE ABDOMINAL EVERSIBLE SACS OF FEMALE BEZZIA VARICOLOR (COQUILLETT) (CERATOPOGONIDAE: DIPTERA)

Published online by Cambridge University Press:  31 May 2012

A. Borkent  and
D.A. Craig
A. Borkent
Affiliation:
Royal British Columbia Museum, 2330 - 70th Street, SE, Salmon Arm, British Columbia, Canada V1E 4M3
D.A. Craig
Affiliation:
Department of Entomology, University of Alberta, Edmonton, Alberta, Canada T6G 2E3
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Abstract

Eversible sacs (= "scent organs" or "eversible tubes" or "eversible glands" of previous authors) are present in the abdomens of females of species of Stenoxenus Coquillett, Paryphoconus Enderlein, Clastrieromyia Spinelli and Grogan, Bezzia Kieffer, Phaenobezzia Haeselbarth, Amerohelea Grogan and Wirth, Pachyhelea Wirth, and Palpomyia Meigen. In Bezzia varicolor (Coquillett) they are attached by muscles to dorsal internal tergal apodemes. When retracted, the sacs lie along the length of the apodemes. Suggested functions of the eversible sacs have ranged from roles in mating, mimicry of adult mayfly cerci to enhance predation, to glandular. However, histological examination showed no evidence of glandular tissue associated with the sacs, so a glandular function is discounted. We suggest other possible functions.

Résumé

On trouve des sacs évaginables dans l’abdomen des femelles chez les espèces de Stenoxenus Coquillett, Paryphoconus Enderlein, Clastrieromyia Spinelli et Grogan, Bezzia Kieffer, Phaenobezzia Haeselbarth, Amerohelea Grogan et Wirth, Pachyhelea Wirth et Palpomyia Meigen. Chez Bezzia varicolor (Coquillett), ces sacs sont rattachés par des muscles aux apodèmes dorsaux internes des tergites. Invaginés, les sacs reposent longitudinalement le long des apodèmes. Des rôles divers ont été attribués à ces sacs évaginables : fonction reproductrice, mimétisme des cerques des éphémères pour favoriser la prédation, fonction glandulaire. Cependant, un examen histologique a démontré qu’aucun tissu glandulaire ne semble associé aux sacs et cette fonction n’est donc pas plausible. Nous suggérons d’autres possibilités.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 3 , June 1994 , pp. 533 - 541
Copyright
Copyright © Entomological Society of Canada 1994

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