The trunk bears three openings mouth ,atriopore and anus.The oral hood formed by dorsal and lateral projections of the body. Mouth is formed by margin by oral hood. Atriopore is a small ventral aperture just in front of the ventral fin. The large atrial cavity surrounding the pharynx opens to outside through atriopore.The anus lies asymmetrically to the left of mid-ventral line at the base of caudal fin. The small posterior body region the anus is the tail.
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