Rotifers are multicellular organisms whose body cavities are partially lined with mesoderm.
The digestive system of rotifers is similar to that of humans and other animals.
The organisms have specialized organ systems as well as a complete digestive system that includes a mouth and anus.
A mouth, ciliated buccal tube, pharynx, trophy, a pair of rami unmanured, stomach, syncytial intestine, dorsal anus, and other specialized components are found in all rotifers
Rotifers range in length from to , but some can be up to or as small as .
Rotifers have nearly identical digestive organs to humans, with the exception that we have more organs to release different digesting enzymes, including the salivary gland, liver, pancreas, stomach, and gallbladder