Relating to or located within the body cavity or coelom, the main body cavity of animals.
From endo- + coel- (from Greek koilos, 'hollow') + -iac. The coelom is the fluid-filled body cavity; endocoeliac describes structures within it.
The coelom is what separates 'sophisticated' animals from simple ones—organisms with a true coelom can evolve larger bodies, more complex organs, and specialized body systems because organs have space to develop.
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