Nematode
(Redirected from Roundworms)
Nematodes or roundworms belong to the phylum Nematoda. They are a diverse animal phylum inhabiting a broad range of environments. Nematode species can be difficult to distinguish, and although over 25,000 have been described, of which more than half are parasitic, the total number of nematode species has been estimated to be about 1 million.
Anatomy
Nematodes are small, slender worms: typically about 5 to 100 µm thick, and 0.1 to 2.5 mm long. The smallest nematodes are microscopic, while free-living species can reach as much as 5 cm, and some parasitic species are larger still, reaching over a meter in length.
Life cycle
Nematodes follow an eutely pattern of development. The young nematode hatches from an egg. Most nematode species are dioecious, with separate male and female individuals, though some, such as Caenorhabditis elegans, are hermaphroditic.
Ecology
Nematodes play crucial roles in the soil ecosystem. They are ubiquitous in marine, freshwater and terrestrial environments, where they often outnumber other animals in both individual and species counts.
Parasitism
Many nematodes are parasitic, living inside the bodies of animals or plants. The parasitic nematodes include roundworms, hookworms, and pinworms.
Research
The nematode Caenorhabditis elegans is one of the most important model organisms in modern biomedical research.
See also
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Nematode
C. elegans Goldstein Lab UNC
Eophasma jurasicum
C. elegans wt nhr80rnai
Hookworms
Gravid adult female Nippostrongylus brasiliensis
Anisakids
Threadworm
Microfilaria
- Nematode Steinernema feltiae.jpg
Nematode Steinernema feltiae
- Nematode Steinernema Feltiae with size comparison of 1 EURO coin.webm
Nematode Steinernema Feltiae with size comparison of 1 EURO coin
Tropical Diseases - Fig 149
C. elegans male
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