The body cavity in branchiostoma is true coelom lined with somatic and splanchnic layers of mesoderm and filled with a lymph like coelomic fluid. It is enterocoelic in origin. The pair of dorsal longitudinal coelomic canals are present. A mid ventral longitudinal subendostylar coelomic canals running through the primary gill bars.Besides small coelomic spaces are also present within the gonads and around the midgut or liver diverticulum.
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