Cysticercoid
Cysticercoid
Cysticercoid (pronunciation: sis-ti-ser-koid) is a term used in the field of Parasitology to describe a certain stage in the life cycle of some cestode parasites.
Etymology
The term 'Cysticercoid' is derived from the Greek words 'kystis' meaning bladder, and 'kirkos' meaning circle. This is in reference to the circular or oval shape of the cysticercoid larvae.
Definition
A Cysticercoid is the larval stage of certain tapeworms, specifically those belonging to the order Cyclophyllidea. This stage is characterized by a small, solid-bodied larva enclosed in a protective cyst. The cysticercoid develops within the intermediate host, typically an invertebrate such as an insect or crustacean.
Life Cycle
The life cycle of a cestode parasite involves several stages, with the cysticercoid stage being one of the most crucial. The cysticercoid develops from an egg ingested by an intermediate host. Inside the host, the egg hatches into an oncosphere, which then develops into a cysticercoid. The cysticercoid remains in the host's tissues until the host is consumed by the definitive host, typically a vertebrate. Once inside the definitive host, the cysticercoid develops into an adult tapeworm.
Related Terms
- Cestoda: A class of parasitic flatworms, commonly known as tapeworms.
- Cyclophyllidea: An order of tapeworms that includes species which undergo a cysticercoid stage in their life cycle.
- Oncosphere: The first larval stage of a cestode parasite, which develops into a cysticercoid.
- Definitive host: The organism in which a parasite reaches sexual maturity and reproduces.
External links
- Medical encyclopedia article on Cysticercoid
- Wikipedia's article - Cysticercoid
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