Definition of diploblastic in US English:



  • Having a body derived from only two embryonic cell layers (ectoderm and endoderm, but no mesoderm), as in sponges and coelenterates.

    • ‘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.’
    • ‘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.’
    • ‘Compartmentalization is also the underlying advantage epithelia provide in triploblastic descendants of a diploblastic ancestor.’