Roundworms, the nematodes, number more than 15,000 known species, and a single handful of garden soil can hold many thousands of individuals. If current estimates of undiscovered species are close, they would be the second most diverse group of animals after the arthropods. The body is long and narrow like a tiny thread, which is the origin of the name, since nema is Greek for thread. A tough, flexible cuticle serves as a skeleton and is shed periodically, usually four times before adulthood. All the muscles run lengthwise, so a nematode can only bend from side to side. Current studies place nematodes in the Ecdysozoa with the arthropods and priapulids.
Roundworms (Nematoda)
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UC Museum of Paleontology: Introduction to the Nematoda
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Not only are there more than 15,000 known species of roundworms
Wikipedia: Wuchereria bancrofti
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Wuchereria bancrofti is a filarial (arthropod-borne) nematode (roundworm) that is the major cause of lymphatic filariasis.
Loa loa filariasis (Wikipedia)
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Loa loa filariasis or loiasis is a skin and eye disease caused by the nematode worm Loa loa.
Capillaria aerophila (Wikipedia)
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Capillaria aerophila is a nematode parasite found in the respiratory tract of foxes, dogs, and various other carnivorous mammals.
Wikipedia: Ascaris lumbricoides
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Ascaris lumbricoides is a large parasitic roundworm of the genus Ascaris.
Wikipedia: Nematode
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The nematodes ( NEM-ə-tohdz, NEE-mə-), roundworms or eelworms constitute the phylum Nematoda (Ancient Greek: Νηματώδη; Latin: Nematoda).
Wikipedia: Caenorhabditis elegans
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Caenorhabditis elegans () is a free-living transparent nematode about 1 mm in length that lives in temperate soil environments.
Wikipedia: Trichinella spiralis
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Trichinella spiralis is a viviparous nematode parasite, occurring in rodents, pigs, bears, hyenas and humans, and is responsible for the disease trichinosis.
Toxocara canis (Wikipedia)
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Toxocara canis (T. canis, also known as dog roundworm) is a worldwide-distributed helminth parasite that primarily infects dogs and other canids, but can also infect other animals including humans.
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