During the formation of the rotocoel, the inner end of the early gut moves towards the ventral surface and opens to outside through a mouth.The gut is now regionated into the oesophagus, stomach and intestine.The intestine opens to outside through an anus, formed at the side of the closed blastopore.The embryo become unfifomly ciliated and escape from the egg membrane to lead a free swimming larval life. It is called tornaria.
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