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Évolution Régressive des Ovarioles Chez les Coléoptères Scarabaeinae

Évolution Régressive des Ovarioles Chez les Coléoptères Scarabaeinae Summary The presence of the left ovary only, reduced to a single ovariole, is characteristic of the females of Scarabaeinae. This study shows that the reduction of the number of ovarioles, in this group, takes place during postembryonic development, after the formation of two symetrical gonads in which 6 ovarioles are differentiated, as in most Scarabaeoidea. The process which leads to the regression of the right ovary and of all the left ovarioles except one, remains obscure. Its origin must be sought out at an early developmental stage. In the final instar larva and in the pupa, it has been possible to observe some interesting phenomena during organogenesis of the ovaries. These observations deal in particular: — with the histological structure of the atrophied ovarioles, apparently sterile, which are induced to disappear; — with the differences in development 1) between the right and left gonads, 2) between the glandular and emitting parts of the ovariole. The conditions of this organogenesis allow the accidental persistance of a rudimentary ovariole: an aberrant female, described in this study, has two ovarioles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales de la Société entomologique de France (N S ) Taylor & Francis

Évolution Régressive des Ovarioles Chez les Coléoptères Scarabaeinae

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Publisher
Taylor & Francis
Copyright
© 1979 Société entomologique de France
ISSN
2168-6351
eISSN
0037-9271
DOI
10.1080/21686351.1979.12278726
Publisher site
See Article on Publisher Site

Abstract

Summary The presence of the left ovary only, reduced to a single ovariole, is characteristic of the females of Scarabaeinae. This study shows that the reduction of the number of ovarioles, in this group, takes place during postembryonic development, after the formation of two symetrical gonads in which 6 ovarioles are differentiated, as in most Scarabaeoidea. The process which leads to the regression of the right ovary and of all the left ovarioles except one, remains obscure. Its origin must be sought out at an early developmental stage. In the final instar larva and in the pupa, it has been possible to observe some interesting phenomena during organogenesis of the ovaries. These observations deal in particular: — with the histological structure of the atrophied ovarioles, apparently sterile, which are induced to disappear; — with the differences in development 1) between the right and left gonads, 2) between the glandular and emitting parts of the ovariole. The conditions of this organogenesis allow the accidental persistance of a rudimentary ovariole: an aberrant female, described in this study, has two ovarioles.

Journal

Annales de la Société entomologique de France (N S )Taylor & Francis

Published: Jul 31, 1979

Keywords: Coleoptera; Scarabaeoidea; Scarabaeinae; Onthophagus lecontei; ovaire; nombre d'ovarioles; organogenèse; régression ovarienne; ovarioles stériles

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