Abstract
Ultrastructural studies carried out on the coupling system of the leptophlebiids, Habroleptoides confusa, Habrophlebia eldae and Choroterpes picteti identified the fine morphology of the external genital apparatus. In H. confusa and H. eldae penes consisted of two lobes, each presenting a ventral appendage folded onto itself to form a sperm groove. The structure of the appendages and their merging with the penis lobes differed with the species. By contrast, in Ch. picteti appendages were not present and the sperm duct was completely incorporated inside the penes. No peculiar differentiation was observed for the female genitalia of Ch. picteti. By contrast, there were found a subgenital plate in H. confusa and a tubular ovipositor in H. eldae. The morphology of the male and female coupling systems are discussed in view of both paleomorphological traits and aflagellate sperms.
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