short note on Annelida
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Answer:
Annelida is a group commonly referred to as segmented worms, and they are found worldwide from the deepest marine sediments to the soils in our city parks and yards. Through most of the 20th century Annelida was split into three major groups; Polychaeta, Oligochaeta (earthworms etc.) and Hirudinea (leeches). Earthworms and leeches are the familiar annelids for most people, but polychaetes comprise the bulk of the diversity of annelida.
Answer
Annelidans are aquatic or terrestrial, free living or parasitic in nature. *Annelidans are bilaterally symmetrical, triploblastic, schizocoelomates with segmented body. *They exhibit organ-system level of organization. *Locomotion is by longitudinal muscles, circular muscles and setae. *Closed type of circulatory system is seen. *Nephridia help in osmoregulation and excretion. *Nervous system comprises of nerve ganglia connected to nervecords. *Annelids are both dioeciousand moneciousexhibiting sexual reproduction. *Annelida gets its name from the Latin word “anellus,” which means "little ring". Annelids are characterised by the presence of a circulatory system.e.g. Earthworm.
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