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A GYNANDROMORPH OF RACHISPODA SUBPILIGERA (MALLOCH) (DIPTERA: SPHAEROCERIDAE), WITH NOTES ON ASYMMETRY, CIRCUMVERSION, AND THE STRUCTURE OF THE MALE POSTABDOMEN

Published online by Cambridge University Press:  31 May 2012

Terry A. Wheeler
Terry A. Wheeler
Affiliation:
Department of Biology, Carleton University, Ottawa, Ontario, Canada K1S 5B6
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Abstract

A gynandromorph of Rachispoda subpiligera (Malloch) is described. The specimen exhibits both bilateral and anterior/posterior division of male and female genitalic components. Abdominal segment 5 is male, segments 6 and 7 are bilaterally divided into male (right) and female (left) halves, and segments 8–11 are female. Comparison of male and female components supports the view that the large, asymmetrical sclerite posterior to sternite 5 in male Sphaeroceridae is synsternite 6 + 7. Circumversion of the genitalia, normally seen in male segments 8–11, is absent, although male components of segments 6 and 7 exhibit asymmetry normally associated with circumversion. This suggests that asymmetry of sternites 6 and 7 is a developmental process independent of circumversion, not a direct consequence of circumversion.

Résumé

On trouvera ici la description d’un gynandromorphe de Rachispoda subpiligera (Malloch). Les composantes génitales mâles et femelles du spécimen ont subi à la fois une division bilatérale et une division antéropostérieure. Le segment abdominal 5 est mâle, les segments 6 et 7 ont subi une division bilatérale séparant chaque segment en une moitié mâle (droite) et une moitié femelle (gauche); les segments 8–11 sont femelles. La comparaison des composantes mâles et femelles appuie la théorie selon laquelle le grand sclérite asymétrique postérieur au sternite 5 chez les mâles des Sphaeroceridae est le synstemite 6 + 7. La circonversion des genitalia, observée normalement dans les segments mâles 8–11, est absente, bien que les composantes mâles des segments 6 et 7 reflètent l’asymétrie normalement associée à la circonversion. Il semble donc que l’asymétrie des sternites 6 et 7 soit un processus de développement indépendant de la circonversion et non pas une conséquence directe de la circonversion.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 4 , August 1992 , pp. 729 - 735
Copyright
Copyright © Entomological Society of Canada 1992

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