Title: Nematoda: Free-living and Parasitic Roundworms
Headings: Nematoda: Roundworms
Nematoda: Roundworms
Nematoda: Types of Nematodes
Nematoda Anatomy
Free-living Nematodes
Parasitic Nematodes
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Content: Nematoda: Free-living and Parasitic Roundworms
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Nematoda: Roundworms
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Regina Bailey
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B.A., Biology, Emory University
A.S., Nursing, Chattahoochee Technical College
Regina Bailey is a board-certified registered nurse, science writer and educator. Her work has been featured in "Kaplan AP Biology" and "The Internet for Cellular and Molecular Biologists." our editorial process
Regina Bailey
Updated January 13, 2020
Nematoda is the phylum of the Kingdom Animalia that includes roundworms. Nematodes can be found in almost any type of environment and include both free-living and parasitic species. Free-living species inhabit marine and freshwater environments, as well as the soils and sediments of all of the various types of land biomes. Parasitic roundworms live off of their host and can cause disease in the various types of plants and animals they infect. Nematodes appear as long, thin worms and include pinworms, hookworms, and Trichinella. They are among the most numerous and diverse organisms on the planet.