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The gastropod Vitta zebra (Bruguière, 1792) (Neritidae): a possible amphidromous species threatened by human impact in Brazilian rivers

Amphidromous organisms grow, feed and reproduce in rivers but the newly hatched larvae migrate to the marine environment where they develop. The juveniles then migrate to fresh water. The present study aims to record the occurrence of the gastropod Vitta zebra in the São Francisco River, northeastern Brazil, and to warn of the risks the species faces due to the possible effects of human impact on its life cycle. Studies on the presence of the species in this river are required in order to develop conservation strategies.