The body cavity in certain marine animals that develops from outpocketings of the intestinal wall during embryonic development.
From Greek 'enteron' (intestine) and 'koilos' (hollow or cavity). This term emerged in comparative anatomy in the 1800s as scientists studied how different animals develop in the womb.
The enterocoel is what separates some sea creatures evolutionarily—it's one of those tiny details that actually makes massive differences in how animal bodies are organized!
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