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Diploblastic
Ectoderm and Endoderm (Epidermis and gastrodermis)
Mesoglea
Gastrocoel gastrovascular cavity
Extracellular and intracellular digestion
Hydroskeleton
Triploblastic
Ectoderm, endoderm and the mesoderm
Parenchyma mesenchyme
Acoelomates
Ladder-type nervous system vs diffuse nervous system
(nerve net)
Ganglion (collection of nerve cell bodies)
Nerve (collection of fibers)
Flame cells
Pseudocoelmates (false body cavity)
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