A class of the phylum Platyhelminthes commonly referred to as tapeworms. All members are endoparasites, usually in the digestive tract of vertebrates. The class has been subdivided as follows:

• Class Cestoidea
• Subclass Cestodaria
• Order: Amphilinidea
• Gyrocotylidea
• Subclass Cestoda
• Order: Proteocephaloidea
• Tetraphyllidea
• Lecanicephaloidea
• Trypanorhyncha
• Diphyllidea
• Pseudophyllidea
• Cyclophyllidea
• Nippotaeniidea