Located outside or external to the body cavity or coelom.
From Greek 'ekto-' (outside) and 'koilos' (hollow or cavity), with '-ic' suffix, describing anatomical structures positioned outside the main body cavity.
Ectocelic structures are anatomist's landmarks—when you know something is ectocelic, you immediately know it's positioned on the outer body wall rather than tucked inside, like finding a label that tells you exactly where to look.
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