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Cytological studies carried out by light and electron microscopy demonstrated that the genital apparatus of Helix aspersa was dualistic in origin : the proximal gonoduct was of ectodermal origin and differentiated from an evagination of the palleal cavity ; the gonad rudiment consisted of two voluminous germ cells surrounded by small mesodermal cells. The segregation of the germ cells occurred early, i.e. during embryonic life, before torsion. The origin of these cells was unknown. Our data do not agree with the concept of a germinal epithelium in which male and female cells differentiate from indeterminate stem cells.

reproduction nutrition development/annales de biologie animale, biochimie, biophysique/reproduction nutrition développement

Contribution à l'étude de l'embryogenèse de l'appareil génital d'Helix aspersa ; mise en évidence de la participation de deux types cellulaires à l'édification de la gonade