Flatworms
Flatworms
Flatworms (pronounced: /ˈflætwɜːrm/), also known as Platyhelminthes (pronounced: /ˌplætiːˈhɛlmɪnθiːz/), are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates. The etymology of the term "flatworm" is derived from their flattened body shape, while "Platyhelminthes" is derived from the Greek words "platys" meaning flat and "helmins" meaning worm.
Flatworms are one of the most common types of worms and can be found in marine, freshwater, and even terrestrial environments. They are known for their distinctive flat, ribbon-like or leaf-like body shape.
Anatomy
Flatworms have a simple body structure with a head, a tail, and a central body. The body is covered with a layer of epidermal cells which protect the worm from the environment. The nervous system of flatworms is more complex than that of other invertebrates.
Classification
Flatworms are classified into four classes: Turbellaria, which are mostly non-parasitic and include the well-known planarians; Monogenea and Trematoda, which are parasitic flukes; and Cestoda, the tapeworms.
Reproduction
Flatworms can reproduce both sexually and asexually. Many flatworms are hermaphrodites, possessing both male and female reproductive organs.
Parasitic Flatworms
Some species of flatworms are parasitic and can cause diseases in humans and other animals. The most well-known parasitic flatworms are the tapeworm and the blood fluke.
See Also
References
External Links
External links
- Medical encyclopedia article on Flatworms
- Wikipedia's article - Flatworms
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