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Updated: Jun 4, 2026

Cytological Analysis of Spermatogenesis: Live and Fixed Preparations of Drosophila Testes
Published on: January 20, 2014
The spermatodesm of Cloeon dipterum (L.): fine structure and sperm movement
Pietro Lupetti1, Caterina Mencarelli, David Mercati
1Department of Evolutionary Biology, University of Siena, via A.Moro 2, 53100 Siena, Italy.
Abstract:
Sperm bundles of the ephemeropteran Cloeon dipterum (L.) were found in the seminal vesicle. They are apically protected by cyst cells and sperm anterior regions are embedded in a secretion produced by these cells. Cyst cells further degenerate making sperm cells free. The sperm bundles are able to perform a forward progression only when sperm are stick together with their tail posterior tips. On the contrary, when sperm have their tail ends free, they beat but are unable to progress. The functional significance of the sperm bundles is discussed.
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