Flatworm
Flatworm
Flatworms (pronunciation: /ˈflætwɜːrm/), scientifically known as Platyhelminthes (pronunciation: /ˌplætiːˈhelminθiːz/), are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Etymology
The term "flatworm" is derived from the Old English words "flæt," meaning flat, and "wyrm," meaning worm. The scientific name "Platyhelminthes" is derived from the Greek words "platys," meaning flat, and "helmins," meaning worm.
Description
Flatworms are characterized by their flattened, ribbon-like or leaf-like body shape. They lack body cavities and circulatory system, and have a simple digestive system. There are four main classes of flatworms: Turbellaria, which are mostly non-parasitic and include the well-known planarians; Monogenea and Trematoda, which are parasitic flukes; and Cestoda, the tapeworms.
Life Cycle
The life cycle of flatworms varies greatly between species and classes. Some flatworms reproduce sexually, while others reproduce asexually through a process known as fission. Many parasitic flatworms have complex life cycles involving multiple hosts.
Medical Significance
Some species of flatworms, particularly those in the classes Trematoda and Cestoda, are of medical importance as they can cause diseases in humans and other animals. These include schistosomiasis, caused by the blood flukes of the genus Schistosoma, and taeniasis, caused by tapeworms of the genus Taenia.
Related Terms
- Parasitology: The study of parasites and parasitic diseases, including those caused by flatworms.
- Helminthology: The study of parasitic worms (helminths), including flatworms.
- Anthelmintic: A type of drug used to treat infections caused by helminths, including flatworms.
External links
- Medical encyclopedia article on Flatworm
- Wikipedia's article - Flatworm
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