Category: Animals with Shells

Heteropods

Molluscs with reduced shells, medial swimming fin, well developed eyes and a nearly transparent body; size to 300 mm.

Janthina

Small to medium-sized pelagic sea snails, commonly known as purple snails or violet shells. These snails live at sea-air interface.

Pteropods

Small, swimming pelagic snails, commonly known as "sea butterflies."