Nematodes are the second most diverse animal phylum (after the arthropods), with about 20,000 species. Free-living nematodes are abundant in soils and sediments, where they feed on bacteria and detritus. Some nematodes are plant parasites, including organisms that cause disease in economically important crops. Others parasitize animals (including humans). Well-known parasitic nematodes include hookworms, pinworms, Guinea worm (genus Dracunculus), and intestinal roundworms (genus Ascaris). Most nematodes are long, slender, almost featureless externally, tapered at both ends, and round in cross section.
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- Max Planck Institute for Biotechnology The Streit Lab studies spatiotemporal control of homeotic genes in the nematode Caenorhabditis elegans.
- Hammerschmidtiella diesingi Photographic study by Walter Dioni on this and other nematodes found living in a cockroach with many detailed images.
- Nematode Species List Nematodes listed alphabetically by genera.
- Plant and Insect Parasitic Nematodes A mass of information on nematodes, their study, surveys, agricultural issues, identification and systematics.
- Longevity and Ageing in Parasitic and Free-living Nematodes Paper by David Gems examining the great variability in ageing patterns observed in different nematode species.
- Heartworm Information from Wikipedia on this parasitic nematode, Dirofilaria immitis, which is spread by mosquitoes.
- Anguillicola crassus Information from Wikipedia on this nematode that lives in the swimbladders of eels, and the life cycle of the parasite.
- Entomopathogenic nematode Information from Wikipedia on these roundworms that are lethal insect parasitoids, and some of which are used in the biological control of insect populations.
- Dirofilaria immitis Greg Eddy provides information on the Dog Heartworm, its classification, adaptation, habitat, nutrition, reproduction and interaction with its host.
- Anisakis simplex Research project on this marine parasitic nematode by Rachel Nelson at the University of Wisconsin-LaCrosse.
- Trichinella spiralis Research project by Andrew Maiers at the University of Wisconsin-LaCrosse.
- Dynamic Development Embryonic development is described with links to illustrated movies.
- Chromadoroidea Key Provides an illustrated key to the genera of free-living marine nematodes in this superfamily.
- Soil Inhabiting Nematodes Introduction to soil nematodes, their classification, feeding habits, place in the community and function in the decomposition process, with an anatomical diagram of a typical plant parasitic species.
- Brainworm Nematode: Parelaphostrongylus tenuis Photographs and information on this parasitic organism and its life cycle.
- Predatory Nematode: Mononchus Photographs and information on these non-parasitic organisms.
- The Big Red Worm Photographs and information on these parasitic organisms, Eustrongylides ignotus and Eustrogylides tubifex.
- Phylum Nematoda An introduction to the roundworms. Includes characteristics, ecology, anatomy, classification and information on the species that parasatise humans.
- Nematoda: Roundworms Phylogenetic information from the Tree of Life Web Project.
- Wormatlas: Caenorhabditis elegans A database of behavioral and structural anatomy.
- Nemaplex The Nematode-Plant Expert Information System, a virtual encyclopedia on soil and plant nematodes, developed and maintained at the University of California, Davis.
- Dirofilaria immitis Nematode transcriptome analyses of the dog heartworm.
- 959 Nematode Genomes Collaborative wiki which collates information on completed, ongoing and planned genome and transcriptome sequencing projects on species from the phylum Nematoda.
- Caenorhabditis elegans Movies Links to films showing the growth and development of C. elegans from researchers worldwide, housed in the laboratory of Bob Goldstein at UNC Chapel Hill.
- Angiostrongyliasis Information on the nematode, Angiostrongylus cantonensis, which can cause meningitis, and diagrams and information on its life cycle.
- Anisakiasis Information on the nematodes, Anisakis simplex and Pseudoterranova decipiens, which can infect humans who eat raw fish, with diagrams and information on their life cycle.
- Gnathostomiasis Information on the nematodes Gnathostoma spinigerum and Gnathostoma hispidum which can infect vertebrates, with a diagram and information on their life cycle.
- Strongyloidiasis Information on the nematode Strongyloides stercoralis which can infect humans, and a diagram and information on its complex life cycle.
- Dracunculiasis Information on the nematode Dracunculus medinensis which can infect humans and cause guinea worm disease, with a diagram and information on its life cycle.
- Trypanosomiasis, American Information on Trypanosoma cruzi, the causal agent of Chagas disease which is transmitted by blood-sucking triatomine bugs, with diagrams and information on the life cycle of the parasite.
- Hookworm Information on the nematodes Ancylostoma duodenale and Necator americanus which can invade and parasatize humans, and a diagram and information on their life cycle.
- Phylum Nematoda Bilaterally symmetrical, worm-like organisms.