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22(21). Animals with a body usually moderately elongate and cylindrical; 3 main body regions, often discernible as a distinct head, trunk and foot; head with a characteristic crown of cilia giving the illusion of rotating wheels; body may be flexible or enclosed in a rigid capsule
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-Animals with a well defined head usually separated from body by a distinct neck; general body surface covered by a cuticle often possessing a variety of outgrowths in the form of spines, scales and plates posteriorly, often with 2 backward projections
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