Conoidasida: Difference between revisions
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Revision as of 23:32, 4 June 2012
| Conoidasida | |
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| Eimeria maxima oocysts | |
| Scientific classification | |
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| Phylum: | |
| Class: | Conoidasida
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| Subclasses | |
Conoidasida is a class of protists. The class was defined in 1988 by Levine[1] and contains two subclasses - the coccidia and the gregarines. All members of this class have a complete, hollow, truncated conoid. Gregarines tend to parasitize invertebrates with the mature gamonts being extracellular, the coccidia mostly infect vertebrates and have intracellular gamonts.
Description
A conoid is found in most species and when present forms complete but truncated cone.
Sexual and asexual reproduction are present in life cycle of all species. Each zygote normally forms an oocyst wall within which it undergoes meiosis. This is sometimes followed by mitosis. This process of sporogony produces mobile vermiform infectious sporozoites.
Multiple mitotic divisions (schizogony) also occur during merogony of the feeding stages (trophozoites) and during gametogony.
Motility
Microgametes of some species are flagellated. Locomotion of other gametes and any other motile stages is by gliding or body flexion. Some species possess pseudopodia but use them only in phagocytosis.
External links
- "Conoidasida". Integrated Taxonomic Information System. Retrieved June 1, 2007.
References
- ^ Levine, N.D. (1988). The protozoan phylum Apicomplexa. The Protozoan Phylum Apicomplexa. CRC Press. ISBN 978-0-8493-4653-8.
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