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Planorbis :: Planorbis (n.) Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form..

Pulmonata :: Pulmonata (n. pl.) An extensive division, or sub-class, of hermaphrodite gastropods, in which the mantle cavity is modified into an air-breathing organ, as in Helix, or land snails, Limax, or garden slugs, and many pond snails, as Limnaea and Planorbis..

Water Snail :: Water snail () Any aquatic pulmonate gastropod belonging to Planorbis, Limnaea, and allied genera; a pond snail..

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