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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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References

Brust, R.A. 1966. Gynandromorphs and intersexes in mosquitoes (Diptera: Culicidae). Canadian Journal of Zoology 44: 911–921.Google Scholar
Crampton, G.C. 1942. The external morphology of the Diptera. pp. 10–165in Guide to the Insects of Connecticut. Part VI. The Diptera or True Flies of Connecticut. First Fascicle. Connecticut State Geological and Natural History Survey Bulletin 64.Google Scholar
Davies, D.M. 1988. Gynandromorphs in Canadian Simuliidae (Diptera). Proceedings of the Entomological Society of Ontario 119: 87–89.Google Scholar
Emmert, W. 1972. Entwicklungsleistungen abdominaler Imaginalscheiben von Calliphora erythrocephala (Insecta, Diptera). Experimentelle Untersuchungen zur Morphologie des Abdomens. Wilhelm Roux’ Archiv für Entwicklungsmechanik der Organismen 169: 87–133.CrossRefGoogle Scholar
Griffiths, G.C.D. 1972. The phylogenetic classification of Diptera Cyclorrhapha with special reference to the structure of the male postabdomen. Dr. W. Junk, The Hague. 340 pp.Google Scholar
Iwasa, M., and Shinonaga, S.. 1982. A wild-caught gynandromorph in a muscid fly, Hydrotaea zao Shinonaga et Kano, 1973 (Diptera, Muscidae). Kontyû 50: 649–651.Google Scholar
Kim, K.C., and Cook, E.F.. 1966. A comparative external morphology of adult Sphaeroceridae (Diptera). Miscellaneous Publications of the Entomological Society of America 5: 78–100.Google Scholar
Kurahashi, H. 1977. A gynandromorph in Parasarcophaga harpax (Diptera, Sarcophagidae), with special reference to “hypopygium circumversum” of the calyptrate postabdomen. Kontyû 45: 372–376.Google Scholar
Marshall, S.A., and Richards, O.W.. 1987. Sphaeroceridae. pp. 993–1006in McAlpine, J.F. et al. , (Eds.), Manual of Nearctic Diptera. Volume 2. Research Branch Agriculture Canada Monograph 28.Google Scholar
McAlpine, D.K. 1991. Review of the Australian kelp flies (Diptera: Coelopidae). Systematic Entomology 16: 29–84.CrossRefGoogle Scholar
McAlpine, J.F. 1981. Morphology and terminology — adults. pp. 9–63in McAlpine, J.F. et al. , (Eds.), Manual of Nearctic Diptera. Volume 1. Research Branch Agriculture Canada Monograph 27.Google Scholar
Norrbom, A.L., and Marshall, S.A.. 1988. New species and phylogenetic analysis of Lotophila Lioy (Diptera: Sphaeroceridae). Proceedings of the Entomological Society of Ontario 119: 17–33.Google Scholar
O'Hara, J.E. 1983. Two bilateral gynandromorphs in the Calyptratae (Diptera): Hydrotaea meteorica (Muscidae) and Siphona hokkaidensis (Tachinidae). The Canadian Entomologist 115: 379–386.Google Scholar
Patterson, J.T., and Stone, W.. 1938. Gynandromorphs in Drosophila melanogaster. University of Texas Publication 3825: 1–67.Google Scholar
Roberts, P.A. 1976. The genetics of chromosome aberration. pp. 67–184In Ashburner, M., and Novitski, E. (Eds.), The Genetics and Biology of Drosophila. Volume 1a. Academic Press, London.Google Scholar
Schräder, T. 1927. Das Hypopygium ‘circumversum’ von Calliphora erythrocephala. Ein Beitrag zur Kenntnis des Kopulationsapparates der Dipteren. Zeitschrift für Morphologie und ökologie der Tiere 8: 1–44.Google Scholar