the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Gastropoda > [noun] > superorder Branchifera > order Prosobranchiata > section Holostomata > family Paludinidae > member of (2)
a freshwater snail; (in later use) spec. one of the genus Viviparus (family Viviparidae).
the shell of an apple snail (family Ampullariidae); (also) the snail itself.