Colpodea

Colpodea
Scientific classification
Kingdom:Protista
Phylum:Ciliophora
Class:Colpodea
Small & Lynn 1981
Typical orders

Colpodida
Bursariomorphida
Cyrtolophosida
Bryophryida
Sorogenida
Bryometopida

The Colpodea are a class of ciliate protozoa, common in freshwater and soil habitats. The body cilia are typically uniform, and are supported by dikinetids of characteristic structure, with cilia on both kinetosomes. The mouth may be apical or ventral, with more or less prominent associated polykinetids. Many are asymmetrical, the cells twisting sideways and then untwisting again prior to division, which often takes place within cysts. Colpoda, a kidney-shaped ciliate common in organic rich conditions, is representative.

Most ciliates placed here were originally considered advanced trichostomes, on the assumption that they lacked true oral cilia. However the Bursariomorphida, large carnivorous ciliates whose oral cavity forms a deep anterior pocket, were considered heterotrichs because of their prominent oral polykinetids. The modern class was first defined by Small & Lynn in 1981, based mainly on the structure of the body kinetids.

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