Having a body derived from only two embryonic cell layers (ectoderm and endoderm, but no mesoderm), as in sponges and coelenterates.
- The transition from diploblastic to triploblastic body plans hinges on the origin of mesoderm.
- The other diploblastic phylum, the Ctenophora, surprisingly, has not been reported to have septate junctions.
- The anthozoans are diploblastic animals developing from two epithelial germ cell layers: the ectoderm, facing the seawater, and the endoderm, facing the gastrovascular cavity or coelenteron.
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