Annelid characterization-morphology-symmetry-germ layers

Question

How are Annelid characterized according to illustrations of representing beings, fundamental morphology, kind of symmetry, germ layers and coelom, excretory system, respiratory system, digestive system, circulatory system, nervous system and kinds of reproduction?

Answer 1

Illustrations of symbolizing beings: leeches, earthworms, lugworms. Fundamental morphology: cylindrical body and segmented (or metameric). Kind of symmetry: bilateral. Germ layers and coelom: triploblastics and coelomates. Digestive system: complete. Respiratory system: branchial and cutaneous. Circulatory system: closed, with hemoglobin. Excretory system: a pair of metanephridia in each and every metamere. Nervous system: neural chords, a pair of ganglia per metamere, anterior concentration of the neurons (or primitive brain). Kinds of reproduction: sexual, with monoecious and dioecious beings.