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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.
The branchial arches begin as cylindrical cores of mesenchyme sandwiched between continuous sheets of epidermal ectoderm and internal endoderm.
At a tissue level, an adult hydra is essentially a tube composed of two tissue layers, the ectoderm and the endoderm, which extend throughout the animal.
It is involved in mesoderm development and differentiation of the neural ectoderm into epidermoblasts and neuroblasts.
The presumptive neural tube tissues consist of a layer of ectoderm along the dorsal midline of the embryo, between the notochord and an outer layer of epidermis.
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