Acoela
| Acoela | |
|---|---|
| Many flatworm-like, orange individuals of the Waminoa acoel on a Plerogyra coral (whitish bubbles) | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Xenacoelomorpha |
| Subphylum: | Acoelomorpha |
| Order: | Acoela Uljanin, 1870 |
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 turbellarian flatworms.
The etymology of "acoel" is from the Ancient Greek words ἀ (a), the alpha privative, expressing negation or absence, and κοιλία (koilía), meaning "cavity". This refers to the fact that acoels have a structure lacking a fluid-filled body cavity.
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