Cestoda
Sign in to saveCestoda is a class of parasitic worms in the flatworm phylum (Platyhelminthes). Most of the species—and the best-known—are those in the subclass Eucestoda; they are ribbon-like worms as adults, commonly known as tapeworms. Their bodies consist of many similar units known as proglottids—essentially packages of eggs which are regularly shed into the environment to infect other organisms. Species of the other subclass, Cestodaria, are mainly fish-infecting parasites.
AI overview
Cestoda are parasitic flatworms that live inside other animals, with the most well-known types being tapeworms, which have long, ribbon-like bodies made up of repeating segments that shed egg-filled packages into the environment. They matter because they can infect humans and other animals, spreading through the consumption of contaminated food or water and potentially causing disease.
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Article
18 sectionsContents
- Diversity and habitat
- Anatomy
- Scolex
- Body systems
- Proglottids {{anchor|proglottid}}
- Reproduction
- Life cycle
- Host immunity
- Evolution and phylogeny
- Fossil history
- External
- Internal
- Interactions with humans
- Infection and treatment
- History and culture
- Notes
- References
- Further reading
Cestoda is a class of parasitic worms in the flatworm phylum (Platyhelminthes). Most of the species—and the best-known—are those in the subclass Eucestoda; they are ribbon-like worms as adults, commonly known as tapeworms. Their bodies consist of many similar units known as proglottids—essentially packages of eggs which are regularly shed into the environment to infect other organisms. Species of the other subclass, Cestodaria, are mainly fish-infecting parasites.
All cestodes are parasitic; many have complex life histories, including a stage in a definitive (main) host in which the adults grow and reproduce, often for years, and one or two intermediate stages in which the larvae develop in other hosts. Typically the adults live in the digestive tracts of vertebrates, while the larvae often live in the bodies of other animals, either vertebrates or invertebrates. For example, Diphyllobothrium has at least two intermediate hosts, a crustacean and then one or more freshwater fish; its definitive host is a mammal. Some cestodes are host-specific, while others are parasites of a wide variety of hosts. Some six thousand species have been described; probably all vertebrates can host at least one species.