Explanation

When the coelom arises as a result of a split in the mesoderm sheet, it is called schizocoel. In enterocoel, the coelom arises as an outgrowth of the enteron. The pouches pinch off and enlarge until they squeeze out off the blastocoel. Schizocoel is seen in Annelida, Arthropoda, Mollusca and Chordates. Echinodermata are entercoelomates