Roundworm

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Adenophorea

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   Subclass Enoplia

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   Subclass Chromadoria

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Secernentea

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   Subclass Rhabditia

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   Subclass Spiruria

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   Subclass Diplogasteria

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The roundworms (Phylum Nematoda) are one of the most common phyla of animals, with over 20,000 different described species. They are ubiquitous in freshwater, marine, and terrestrial environments, where they often outnumber other animals in both individual and species counts, and are found in locations as diverse as Antarctica and oceanic trenches. Further, there are a great many parasitic forms, including pathogens in most plants and animals, humans included. Only the Arthropoda are more diverse.

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The roundworms were originally named the Nemata by Nathan Cobb in 1919. Later they were demoted to a class Nematoda in the Aschelminthes, and then restored to phylum Nematoda.

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Phylum: Phylum may refer to the following:...

Phyla: Phyla, the plural of phylum, may refer to:...

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