My watch list
my.bionity.com  
Login  

Metamonad



Metamonads

Giardia lamblia, a parasitic diplomonad
Scientific classification
Domain: Eukaryota
(unranked) Excavata
Phylum: Metamonada
Grassé 1952 emend.
Classes & orders

Eopharyngia
   Retortamonadida
   Diplomonadida
   Carpediemonas
Parabasalia
Anaeromonadida
   Oxymonadida
   Trimastix

The metamonads are a large group of flagellate protozoa. Their composition is not entirely settled, but they include the retortamonads, diplomonads, and possibly the parabasalids and oxymonads as well. These four groups are all anaerobic, occurring mostly as symbiotes of animals. A number of parabasalids and oxymonads are found in termite guts, and play an important role in breaking down the cellulose found in wood. Some other metamonads are parasites.

Additional recommended knowledge

These flagellates are unusual in lacking mitochondria. Originally they were considered among the most primitive eukaryotes, diverging from the others before mitochondria appeared. However, they are now known to have lost mitchondria secondarily, and retain both organelles and nuclear genes derived from them. Mitochondrial relics include hydrogenosomes, which produce hydrogen, and small structures called mitosomes.

All of these groups are united by having flagella or basal bodies in characteristic groups of four, which are often associated with the nucleus, forming a structure called a karyomastigont. In addition, the genera Carpediemonas and Trimastix are now known to be close relatives of the retortamonad-diplomonad line and the oxymonads, respectively. Both are free-living and amitochondriate.

The metamonads make up part of the excavates, a eukaryotic supergroup including flagellates with feeding grooves and their close relatives. Their relationships are uncertain, and they do not always appear together on molecular trees. It is possible that the metamonads as defined here do not form a monophyletic subgroup.

References

  • T. Cavalier-Smith (2003). "The excavate protozoan phyla Metamonada Grassé emend. (Anaeromonadea, Parabasalia, Carpediemonas, Eopharyngia) and Loukozoa emend. (Jakobea, Malawimonas): their evolutionary affinities and new higher taxa". International Journal of Systematic and Evoluionary Microbiology 53: 1741-1758.
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Metamonad". A list of authors is available in Wikipedia.
Your browser is not current. Microsoft Internet Explorer 6.0 does not support some functions on Chemie.DE