Locomotion in Earthworm:
Earthworms, being terrestrial, are adapted to locomotion in soil. Their movement is brought about by the contraction of two sets of muscles and their body fluid, serving as a hydrostatic skeleton. Contraction of longitudinal muscles shortens the body and contraction of circular muscles lengthens (elongation) the body. As a result of interaction of muscles contractions and compressed body fluid an earthworms crawls.
In addition bristles called setae extending from the body wall in each segment grasp the soil functioning as hold fast to take the grip of the soil.
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