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Postembryonic development of the copulative apparatus in representatives of three genera of the family Planorbidae (Gastropoda: Pulmonata)

Development of the copulative apparatus in the course of postembryogenesis in representatives of the three genera of the family Planorbidae: Anisus vortex, Gyraulus albus, and Choanomphalus amauronius was studied based on the laboratory reared molluscs and on the collection material for the first time. Morphological description of the stylets examined with SEM is given. Problems of the stylet formation in the studied species and genera are considered. The importance of the stylet organization for the planorbid taxonomy is discussed.