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Having a body derived from only two embryonic cell layers (ectoderm and endoderm, but no mesoderm), as in sponges and coelenterates.
- ‘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.’
- ‘According to Haeckel, the gastrula stage can be found in the development of all animals, and represents the recapitulation of the ancestral metazoan, the Gastraea, a diploblastic animal with a ciliated gut.’
- ‘The transition from diploblastic to triploblastic body plans hinges on the origin of mesoderm.’
- ‘Compartmentalization is also the underlying advantage epithelia provide in triploblastic descendants of a diploblastic ancestor.’
- ‘The other diploblastic phylum, the Ctenophora, surprisingly, has not been reported to have septate junctions.’
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