In some species, according to publictions they refer to colemates as a Eucolemates. So, these two words has got the same meaning. Most triploblastic animals posses BODY CAVITY, a fluid -or air - filled space that seperates digestive tract from the outer bodywall. This body cavity known as coelom. A so-called "true" coelom forms from tissue derived from mesoderm. THE İNNER AND OUTER layers of tissue that surround the cavity connect dorsally and ventrally and form stuructures that suspend the internal organs. Animals that posses a true coelom are known as COELOMATES or (in other words) EUCOELATES.