Reptanta

Reptanta, a group of mollusca belonging to the suborder Azygobranchia characterised by the possession of a creeping disc-like foot. It includes three divisions: (1) Holochlamyda, including the Top-shells (Trochus) and the common pond-snail (Paludina); (2) The Pneumonochlamyda, which are terrestrial and breathe by a lung sac, e.g. Cyclostoma; (3) Siphonochlamyda, which are all marine, including the Whelk (Buccinum), the Coneshells ( Conns), the Cowry ( Cyprcea), etc.