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The Acoelomorpha are a disputed phylum of animals with planula-like features and formerly considered to be in Platyhelmintha, but recently classified by Jaume Baguñà and Marta Riutort as a separate phylum, basal among the Bilateria.[1]
The Acoela are very small flatworms that do not have a gut.[2] Digestion is accomplished by means of a syncytium that forms a vacuole around ingested food. There are no epithelial cells lining the digestive vacuole. All other bilateral animals have a gut lined with epithelial cells. As a result, the acoels appear to be solid-bodied (a-coel, or no body cavity). Acoels are almost entirely marine, living between grains of sediment, swimming as plankton, or crawling on algae. Acoels have a statocyst, which presumably helps them orient to gravity.
Their soft bodies make them difficult to classify.[3]
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