Eucestoda

Eucestoda is the larger of the two subclasses of flatworms in the class Cestoda (the other subclass is Cestodaria). The Eucestoda are commonly referred to as tapeworms. Larvae are hexacanth, having six posterior hooks on the scolex (head), in contrast to the decacanth (ten-hooked) Cestodaria. All species of the Eucestoda are endoparasites of vertebrates, living in the digestive tract or related ducts. Examples are the pork tapeworm (Taenia solium, with a human definitive host and pigs as the secondary host) and Moniezia expansa, the definitive hosts of which are ruminants).