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. The Acoela are very small flatworms that don't have a gut. Digestion's accomplished by means of a syncytium that forms a vacuole around ingested food. There're no epithelial cells lining the digestive vacuole. All other bilateral animals have a gut lined w… (More on Acoelomorpha)