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plural acoels
(zoology) A member of the Acoela group of marine flatworms, which lack a digestive cavity with definite walls. quotations
Acoels have no brain or ganglia but a network of nerves beneath the skin that is slightly more concentrated towards the front end.
2012, Caspar Henderson, The Book of Barely Imagined Beings, Granta Books, published 2013, page 89