Studies on the breeding habits and development of the brood-pouch of a viviparous prosobranch; Melania scabra

Studie son the breeding habits and development of the brood-pouch of a freshwater prosobranch, Melania scabra, have revealed that the snail is ovoviviparous, showing parthenogenetic reproduction. The embryos complete their development in a special incubatory pouch called the brood-pouch or brood chamber, and hatch out in a form completely resembling that of the adult. The snail was found to be a continuous breeder, showing gravid condition throughout the year. General structure, development and functions of the brood-pouch were studied in detail. The brood-pouch was found to contain a slightly alkaline albuminous fluid with a pH 7.2, Qualitative and histochemical studies of the brood-pouch revealed the presence of glycogen, fat and protein as the major constituents. These probably play an important role in the nutrition of embryos.