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The male genital tract of Chaoboridae (Diptera: Culicomorpha)

Published online by Cambridge University Press:  02 April 2012

Art Borkent ,
Christopher J. Borkent  and
Bradley J. Sinclair
Art Borkent*
Affiliation:
691–8th Avenue SE, Salmon Arm, British Columbia, Canada V1E 2C2, Research associate of the Royal British Columbia Museum, 675 Belleville Street, Victoria, British Columbia, Canada V8W 9W2, American Museum of Natural History, Central Park West, New York, NY 10024-5192, United States of America, and Instituto Nacional de Biodiversidad, P.O. Box 22-3100, Santo Domingo de Heredia, Costa Rica
Christopher J. Borkent
Affiliation:
Department of Natural Resource Sciences, Macdonald Campus, McGill University, 21,111 Lakeshore Road, Sainte Anne de Bellevue, Quebec, Canada H9X 3V9
Bradley J. Sinclair
Affiliation:
Entomology — Ontario Plant Laboratories, Canadian Food Inspection Agency, K.W. Neatby Building, Central Experimental Farm, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6
*
1Corresponding author (e-mail: [email protected]).
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Abstract

The male genital tract of Chaoboridae, represented by Eucorethra underwoodi Underwood, Mochlonyx velutinus (Ruthe), and Chaoborus trivittatus (Loew), is described for the first time. All genera have paired accessory glands that are attached anteriorly to the vasa deferentia or the base of the testes, a feature that is proposed as a synapomorphy of Chaoboridae + Culicidae. Mochlonyx Loew and Chaoborus Lichenstein have distinctive pigment cells covering their testes and a portion of the vasa deferentia. The simplified male genital tract of Corethrellidae + Chaoboridae + Culicidae is correlated with the virtually unique abrupt and permanent 180° rotation of the male genitalia between segments 7 and 8. In taxa with an accessory-gland complex, the male genitalia are rotated in a more gradual manner, often during copulation.

Résumé

La région génitale mâle de Chaoboridae, représentée par Eucorethra underwoodi Underwood, Mochlonyx velutinus (Ruthe), et Chaoborus trivittatus (Loew), est décrite pour la première fois. Tous les genres ont des glandes accessoires appariées qui sont attachées antérieurement au canal déférent ou à la base des testicules, un trait qui est proposé en tant que synapomorphie de Chaoboridae + Culicidae. Mochlonyx Loew et Chaoborus Lichenstein ont des cellules pigmentées distinctives recouvrant leurs testicules et une partie du canal déférent. La région génitale mâle simplifiée de Corethrellidae + Chaoboridae + Culicidae est corrélée à l’unique rotation de 180°, abrupte et permanente, des organes génitaux masculins entre les segments 7 et 8. Dans les taxa avec un complexe de glandes accessoires, les organes génitaux mâles sont tournés d’une manière plus graduelle, souvent pendant la reproduction.

Type
Articles
Information
The Canadian Entomologist , Volume 140 , Issue 6 , December 2008 , pp. 621 - 629
Copyright
Copyright © Entomological Society of Canada 2008

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