title: The sperm structure of the gall-midges Anaretella and Lestremia (Insecta, Diptera, Cecidomyiidae).
abstract: The sperm structure of some dipteran flies belonging to the Lestremiini tribe have been examined. Anaretella cincta was shown to have an axoneme made of 20-21 microtubular doublets, disposed in a circle in a cross section and surrounding a mitochondrion. Other crystal-containing mitochondria flank the axoneme; a second species (Anaretella sp.) was provided with 21-22 axonemal doublets. Lestremia is characterized by a flattened axoneme, consisting of about 150 doublets arranged in 2 antiparallel rows and surrounding a few mitochondria. These mitochondria, in Lestremia sp., have a crystalline core that is missing in Lestremia cinerea. The structure of microtubular doublets is quite similar in the 2 related genera and a derivation of the flattened axoneme found in Lestremia from that circular of Anaretella is suggested. Sperm structure suggests that Lestremia cinerea is not a uniform species.
authors.affiliation: Department of Evolutionary Biology, University of Siena, Siena, I-53100, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Dallai
authors.forename: P
authors.initials: P
authors.lastname: Lupetti
authors.forename: B A
authors.initials: BA
authors.lastname: Afzelius
authors.forename: B M
authors.initials: BM
authors.lastname: Mamaev