Wikipedia Wainuia Wainuia is a genus of air-breathing predatory land snails, terrestrial pulmonate gastropod molluscs in the family Rhytididae. Wainuia (species unknown) Wainuia (species unknown) is an as yet undescribed species of air-breathing predatory land snail, a terrestrial pulmonate gastropod mollusc in the family Rhytididae.