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Fact file

Roundworms Proper name: Phylum Nematoda (nee-ma-toe-da)
Common name: Roundworms

Numbers of species: About 20,000
Where they are found: In the oceans, in freshwater and on land

Description: Roundworms are usually small worms with thin round bodies. Many of them are parasites living in the organs of other animals.

Need to know: Many roundworms are microscopic - some however can grow to over a metre in length!

Find out more about roundworms

Go back to the Tree of life to find out more about other living things.