THE REPRODUCTION OF THE MINUTE CYCLOPHORID SNAIL OPISTHOSTOMA (PLECTOSTOMA) RETROVERTENS FROM A MALAYAN LIMESTONE HILL

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Abstract

The anatomy and general histology of the male and female genital systems of 0. retrovertens are described. The egg capsules, which are attached to moss or to the limestone itself, produce one juvenile each and this emerges by parting and breaking two valves. The condition of the gonads and the abundance of juvenile snails collected throughout the period of study, fluctuated in a way matching fluctuations in the abundance of moss on the limestone and in monthly rainfall.

Differences between the genital system of 0. retrovertens and those of other cyclophorids, the production of eggs and egg capsules and the apparent seasonality of breeding are discussed.

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