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Abstract
Spermatozoa of Sergentomyia minuta were examined by light, scanning, and transmission electron microscopy. They were seen to be formed by a head and a tail. The head was characterized by an acrosomal complex with a thin space containing granular material organized as in a perforatorium. The tail contained a “9 + 9 + 0”; axoneme and one mitochondrial derivative. A comparison with the spermatozoon ultrastructure of other Diptera, particularly Psychodidae, is discussed.