An outpouching or extension of the coelom, the main body cavity, in certain animals such as echinoderms.
From 'exo-' (outside) and 'coele' (coelom, from Greek 'koiloma' meaning cavity), a term used in comparative zoology to describe specialized body cavity structures.
Starfish and sea urchins use exocoeles to extend their water-vascular systems into their arms and tube feet—it's how they move, feed, and sense their environment without a brain!
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