Entoprocts are small organisms that feed by straining food particles from water.
Some anatomical characteristics of Cotyledion tylodes are comparable to those of modern entoprocts, especially the presence of a U-shaped gut with a mouth and anus surrounded by a crown of tentacles.
Its body was covered in external, hardened structures called sclerites, which are not found on modern entoprocts.
However, few fossil representatives of Lophotrochozoa (the superphylum containing the entoprocts group of animals) have been found in Cambrian fossil records.
To date, the only uncontested fossil entoproct comes from the Jurassic (205 to 142 million years ago).