Secernentea

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Secernentea
Celegans wt nhr80rnai.png
Caenorhabditis elegans (Rhabditia: Rhabditidae)
Scientific classification
Kingdom: Animalia
Subkingdom: Eumetazoa
(unranked): Bilateria
Phylum: Nematoda
Class: Secernentea
Subclasses

Diplogasteria (disputed)
Rhabditia (paraphyletic?)
Spiruria
Tylenchia (disputed)
and see text

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[edit]

Subclasses and orders of Secernentea are:[1]

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. These are also called as Phasmidians as they have the phasmids which are the posterior glandulo sensory and excretory structure.[1]

References[edit]

  1. ^ a b Tree of Life Web Project (ToL) (2002): Nematoda. Version of January 1, 2002. Retrieved November 2, 2008.