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Journal of Cell Science, Vol 12, 287-311, Copyright © 1973 by Company of Biologists

Submitted on May 19, 1972

The Spermatozoon of Arthropoda

XVIII. The Non-Motile Bifurcated Sperm of Psychodidae Flies

B. BACCETTI 1, R. DALLAI 1, and A. G. BURRINI 1

1 Institute of Zoology of the University of Siena Via Mattioli 4, Siena, Italy

The spermatozoa of some species of Diptera belonging to the Psychodidae are described. In the 4 species examined, they appear needle-shaped, non-motile, anteriorly flattened, posteriorly bifid. Flagella, and any microtubule system, are lacking, and the only organelles encountered are an extremely elongated nucleus, a prominent acrosome, a well developed subacrosomal body, a slender, somewhat elongated mitochondrial derivative and a conspicuous multilayered membrane wall, produced by the superimposition of the plasma membrane and the acrosomal membrane. The mitochondrion is devoid of a crystalline axis, while the acrosome contains a longitudinal, cross-striated para-crystalline body. Centrioles are absent throughout the spermatid stage. Sperms and spermatids are organized in syncytia of 210 elements.

Submitted on May 19, 1972






© The Company of Biologists Ltd 1973