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 Representative species: snails, sea slugs, octopuses, squids, mussels, oysters. simple morphology: smooth body, without or with a calcareous shell. type of symmetry: bilateral. Germ layers and coelom: triploblastics, coelomates. Digestive machine: whole. respiratory gadget: branchial or, in terrestrial gastropods, lungs. Circulatory device: open or, in cephalopods, closed. Excretory machine: nephridia. anxious device: ganglial, advanced cephalization in cephalopods. sort of replica: sexual.
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