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TWO BILATERAL GYNANDROMORPHS IN THE CALYPTRATAE (DIPTERA): HYDROTAEA METEORICA (MUSCIDAE) AND SIPHONA HOKKAIDENSIS (TACHINIDAE)

Published online by Cambridge University Press:  31 May 2012

J. E. O'hara
J. E. O'hara
Affiliation:
Department of Entomology, University of Alberta, Edmonton, Alberta T6G 2E3
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Abstract

Two bilateral gynandromorphs, specimens of Hydrotaea meteorica (Linn.) (Muscidae) and Siphona hokkaidensis Mesnil (Tachinidae), are described and illustrated. Circumversion of male genital parts is thought to have been prevented by adjacent female genital elements. Study of essentially unrotated male genital halves of these specimens suggests that asymmetry of male sternite 6 in schizophorans results from asymmetrical development (as advocated by Emmert (1972) and Griffiths (1972)) and not as a consequence of slight rotation during circumversion (as advocated by Crampton (1942) and McAlpine (1981)). From study of genital fusion of male and female sclerites across midline, it is further suggested that sternite 6 + 7 in the above species is derived primarily from sternite 6, not from sternites 6 plus 7 as described in Calliphora vicina R.D. by Emmert (1972).

Résumé

Deux gynandromorphes bilatéraux, des spécimens d'Hydrotaea meteorica (Linn.) (Muscidae) et de Siphona hokkaidensis Mesnil (Tachinidae), sont décrits et illustrés. La circonversion des pièces génitales mâles semble avoir été empêchée par les parties génitales femelles adjacentes. L'étude des moitiés génitales mâles non pivotées de ces spécimens indique que l'asymétrie du sternite 6 mâle chez les schizophores résulte d'un développement asymétrique (tel que proposé par Emmert (1972) et Griffiths (1972)), et non pas d'une rotation légère durant la circonversion (tel que soutenu par Crampton (1942) et McAlpine (1981)). A partir de l'étude de la fusion génitale des sclérites mâles et femelles de part et d'autre de la ligne médiane, il est par ailleurs proposé que le sternite 6 + 7 chez les espèces ci-dessus, est dérivé principalemnt du sternite 6, et non des sternites 6 et 7 tel que décrit pour Calliphora vicina R.D. par Emmert (1972).

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 4 , April 1983 , pp. 379 - 386
Copyright
Copyright © Entomological Society of Canada 1983

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