Characteristics of sperm ultrastructure in the gall midges Porricondylinae (Insecta,Diptera, Cecidomyiidae), with phylogenetic considerations on the subfamily |
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| Authors: | R Dallai P Lupetti F Frati B M Mamaev B A Afzelius |
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| Institution: | (1) Dipartimento di Biologia Evolutiva, Università di Siena, Via P.A. Mattioli 4, I-53100 Siena, Italy, IT;(2) Department of Ecology and Forestry, All-Russia Qualification Institute for Forestry Specialists, Institutskaya 17, Pushkino, Moscow Region, Russia, RU;(3) Department of Ultrastructure Research, Biology Building E, Wenner-Gren Institute, Stockholm University, S-106 91 Stockholm, Sweden, SE |
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| Abstract: | Sperm ultrastructure was studied in ten genera of the Porricondylinae (Cecidomyiidae). Sperm structure is remarkably simplified
by the absence of the acrosome and the accessory tubules, as happens in all the cecidomyiid flies. All genera of the Porricondylinae
show a peculiar 9+3 axonemal model except Diallactes, which retains the plesiomorphic condition of a 9+2 axoneme, and Winnertzia, which appears to have secondarily acquired a 9+0 model. A cladistic analysis of relevant sperm characters (based on the
axonemal model, the number of mitochondrial derivatives and the size and structure of the centriolar adjunct) was performed
to infer phylogenetic relationships among six tribes of the Porricondylinae. In this cladogram, the Porricondylini are the
sister group to the Asynaptini, Heteropezini and Winnertzini and these four taxa form the sister group to the Dicerurini.
The tribe Diallactini are regarded as the group with the most plesiomorphic characters within the family.
Accepted: 15 March 1996 |
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