Nematode

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Nematodes
Eophasma jurasicum.JPG
Eophasma jurasicum, a fossilized nematode
Scientific classification
Kingdom:
Animalia
Subkingdom:
Eumetazoa
(unranked):
Bilateria
Phylum:
Nematoda

Rudolphi, 1808
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Diagram of nematode

The nematodes or roundworms are one of the most diverse of all animal phyla. They are one of the protostome phyla.

Nematode species look very similar to one another. Over 80,000 have been described, of which over 15,000 are parasitic. It has been estimated that the total number of described and undescribed roundworms might be more than 500,000.

The body structure is fairly constant. A thick cuticle gives protection, and acts as a kind of hydrostatic skeleton. Caenorhabditis elegans has had its genetics studied intensively, and it had its genome analysed in the year 1998.[1] DNA sequence analysis of nematodes is quite advanced, including trees of species relationship.[2]

Cell numbers in the organs are constant within a species. Nematodes have a fixed, genetically determined number of cells, a phenomenon known as eutely. The male C. elegans has 1031 cells, a number which does not change after cell division stops at the end of the larval period. Growth is solely due to an increase in the size of individual cells.[3]

Nematode Media

  • Carl Linnaeus described nematodes including the parasitic Dracunculus medinensis, seen here under a person's skin.

  • Internal anatomy of a male C. elegans nematode

  • Colorized electron micrograph of soybean cyst nematode (Heterodera glycines) and egg

  • Disability-adjusted life year for intestinal nematode infections per 100,000 in 2002.
             240      no data

Related pages

References

  1. ↑ APSnet Feature - Implications of sequencing the nematode Caenorhabditis elegans genome for plant nematology. Retrieved 2010-01-04.
  2. ↑ [1][dead link]
  3. ↑ Ruppert, Edward E.. Invertebrate Zoology, 7th edition (2004)Cengage Learning. p. 753. ISBN 978-81-315-0104-7.
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