• (n. pl.) A suborder of Turbellaria including those that have a simple cylindrical, or saclike, stomach, without an intestine.
(from the article `flatworm`) ...marine; mouth present; pharynx simple or lacking; no intestine; without protonephridia, oviducts, yolk glands, or definitely delimited ...
Order of aquatic turbellaria (flatworms). Superceded as a classification.