The main features of echinoderms. How can echinoderms 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: sea cucumber, sea urchin, star fish
Basic morphology: calcareous endoskeleton with spines, ambulacral system
Type of symmetry: secondary radial
Germ layers and coelom: triploblastics, coelomates
Digestive system: complete, deuterostomes
Respiratory system: non-existent
Circulatory system : non-existent
Excretory system: non-existent
Nervous system: simple, nerve network without ganglia or cephalization
Types of reproduction: sexual with a larval stage
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