Cestoda: A subclass of segmented worms comprising the tapeworms.Cestode Infections: Infections with true tapeworms of the helminth subclass CESTODA.Diphyllobothriasis: Infection with tapeworms of the genus Diphyllobothrium.Diphyllobothrium: A genus of tapeworm containing several species which occurs in the intestine of fish, birds, and mammals including man. Infection in humans is usually by eating uncooked fish. The larval stage is known as SPARGANUM.Platyhelminths: A phylum of acoelomate, bilaterally symmetrical flatworms, without a definite anus. It includes three classes: Cestoda, Turbellaria, and Trematoda.Hymenolepis: A genus of small tapeworms of birds and mammals.Helminthiasis, Animal: Infestation of animals with parasitic worms of the helminth class. The infestation may be experimental or veterinary.Paleopathology: The study of disease in prehistoric times as revealed in bones, mummies, and archaeologic artifacts.DNA, Helminth: Deoxyribonucleic acid that makes up the genetic material of helminths.