Topic summary
Acoel
Extracted from the Wikipedia article Acoela.
Acoela, or the acoels, is an order of small and simple invertebrates in the subphylum Acoelomorpha of phylum Xenacoelomorpha, a deep-branching bilaterian group of animals, which resemble flatworms. Historically, they were treated as an order of turbellarianflatworms. About 400 species are known, but probably many more are not yet described.