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 representative species: sea cucumbers, sea urchins, starfish. basic morphology: calcareous endoskeleton with spines, ambulacral machine. kind of symmetry: secondary radial. Germ layers and coelom: triploblastic, coelomates. Digestive device: whole, deuterostomes. respiratory system: nonexistent. Circulatory gadget: nonexistent. Excretory machine: nonexistent. anxious device: simple, nerve network without ganglia or cephalization. type of duplicate: sexual, with a larval stage.
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