Do members of phylum Cnidaria have a mesoderm layer?

are all animals (with the exception of sponges) supposed to have a mesoderm, endoderm, and exoderm?





Thanks a lotDo members of phylum Cnidaria have a mesoderm layer?
No.





Cnidaria and Ctenofora are diploblasts. They only have 2 germ layers. The endoderm and the ectoderm. Whereas triploblasts have all three layers. And poriferans(sponges) have no germ layers.