The main features of molluscs. How can molluscs be described according to examples of representative species, basic morphology, type of symmetry, germ layers and coelom, digestive system, respiratory system, circulatory system, excretory system, nervous system and types of reproduction?
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: sexual.
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