What is "paludina"

Paludina \Pal`u*di"na\, n.; pl. L. Paludin[ae], E. Paludinas. [NL., fr. L. palus, -udis, a marsh, pool.] (Zo["o]l.) Any one of numerous species of freshwater pectinibranchiate mollusks, belonging to Paludina, Melantho, and allied genera. They have an operculated shell which is usually green, often with brown bands. See Illust. of Pond snail, under Pond.

n. Any of numerous species of freshwater pectinibranchiate mollusks, belonging to (taxlink Viviparus genus), (taxlink Melantho genus), and allied genus in ''(taxlink Viviparidae family)''. Their operculated shells are usually green, often with brown bands.