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Diplogasteria (disputed) |
Secernentea are the main class of nematodes, characterised by numerous caudal papillae and an excretory system possessing lateral canals. Like all nematodes, they have no circulatory or respiratory system.
The Secernentea contain several significant parasitic species among the Rhabditia and Spiruria. Caenorhabditis elegans, the famous laboratory animal, is one of the many harmless members of the Rhabditia.
Systematics
Subclasses and orders of Secernentea are:1
- Subclass Rhabditia (paraphyletic?)
- Subclass Spiruria
- Ascaridida
- Camallanida (sometimes included in Spirurida)
- Drilonematida (sometimes included in Spirurida)
- Oxyurida
- Rhigonematida (formerly in Tylenchia)
- Spirurida
- Subclass Diplogasteria (may belong in Rhabditia)
- Subclass Tylenchia (may belong in Rhabditia)
- Order incertae sedis
Some families traditionally considered to be Rhabditida seem to be closer to the Tylenchida. If the Tylenchia are to be maintained as separate, they probably will be included therein.1
Footnotes
References
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Wikimedia Commons has media related to: Secernentea |
- Tree of Life Web Project (ToL) (2002): Nematoda. Version of 2002-JAN-01. Retrieved 2008-NOV-02.
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This nematode- (or roundworm-) related article is a stub. You can help Wikipedia by expanding it. |
Wikipedia content modification information:
- This page was last modified on 5 November 2008, at 16:18.
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