Acanthocephala
Acanthocephala
Acanthocephala (pronounced: a-kan-tho-se-fa-la) is a phylum of parasitic worms known as thorny-headed worms, or spiny-headed worms. The name Acanthocephala comes from the Greek words 'akanthos' meaning 'spine' and 'kephale' meaning 'head'.
Description
The Acanthocephala are characterized by the presence of an eversible proboscis, armed with spines, which it uses to pierce and hold the gut wall of its host. Acanthocephalans have complex life cycles, involving at least two hosts, which may include invertebrates, fish, amphibians, birds, and mammals.
Classification
Acanthocephala includes three classes: Archiacanthocephala, Eoacanthocephala, and Palaeacanthocephala. Each class is distinguished by the structure of the proboscis and the arrangement of hooks.
Life Cycle
The life cycle of Acanthocephala involves an intermediate host, usually an arthropod, where the larvae develop, and a definitive host, where the adult worms reproduce. Eggs are passed in the feces of the definitive host and are eaten by the intermediate host.
Medical Significance
In humans, acanthocephalan infection can occur, but it is rare and usually involves immature worms. Symptoms may include abdominal pain, diarrhea, and weight loss.
Related Terms
- Parasitology: The study of parasites and their hosts.
- Helminthology: The study of parasitic worms (helminths).
- Proboscis: An elongated appendage from the head of an animal.
- Arthropod: An invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages.
External links
- Medical encyclopedia article on Acanthocephala
- Wikipedia's article - Acanthocephala
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