Studies on the Ultrastructure of the Genital Organs in Proseriata (Turbellaria). I. Cirrifera aculeata (Ax) (Coelogynoporidae)

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Abstract
The genital organs in adult specimens of Cirrifera aculeata have been studied by transmission electron microscopy. The male copulatory organ is of the conjuncta‐duplex type provided with a spiny cirrus. The structure of the epithelia lining the different parts of the genital organs is described. The cirrus spines and the spines in the genital atrium are shown to be intracellular specializations. The structure and location of the cirrus spines in the Proseriata studied so far are discussed.