Examples of representing beings: snails, sea slugs, octopuses, squids, mussels, oysters. Basic morphology: soft body, with or without calcareous shell. Type of symmetry: bilateral. Germ layers and coelom: triploblastics, coelomates. Digestive system: complete. Respiratory system: branchial or, in terrestrial gastropods, lungs. Circulatory system: open or, in cephalopods, closed. Excretory system: nephridia. Nervous system: ganglial, advanced cephalization in cephalopods. Types of reproduction: **.
