Top Qs
Timeline
Chat
Perspective
Myzozoa
Group of single-celled organisms From Wikipedia, the free encyclopedia
Remove ads
Myzozoa[1] is a grouping of specific phyla within Alveolata,[2][3] that either feed through myzocytosis, or were ancestrally capable of feeding through myzocytosis.[1]
It is sometimes described as a phylum, containing the major subphyla Dinozoa and Apicomplexa, plus minor subphyla.[4]
The term Myzozoa superseded the previous term Miozoa, by the same authority, and gave a slightly altered meaning.[1]
Remove ads
Phyla
Within Myzozoa, there are four phyla:
- Apicomplexa – parasitic protozoa that lack axonemal locomotive structures except in gametes
- Dinoflagellata – mostly marine flagellates many of which have chloroplasts
- Chromerida – a marine phylum of photosynthetic protozoa
- Perkinsozoa
Evolution
The most closely related large clade to the myzozoans are the ciliates.[1] Both of these groups of organisms – unlike the majority of eukaryotes studied to date – seem to have a linear mitochondrial genome. Most other eukaryotes that have had their mitochondrial genomes examined have circular genomes. However, the taxonomic term Myzozoa specifically excludes ciliates[1] which are rather under the higher taxonomic rank Alveolata. Thus, Alveoata includes two large groups: Myzozoa and Ciliophora[5] plus the smaller groups discussed above.
All Myzozoa appears to have evolved from an ancestor that possessed plastids, required through endosymbiosis.[6]
The branching order within both Myzozoa and Protalveolata, is only partly understood. Three groups – the Colpodellids, Chromerida and the Apicomplexa – appear to be sister clades.[7] Three other groups – the Perkinsids, Syndiniales and Oxyrrhis are distantly related to the dinoflagellates.[8][9]
Remove ads
Notes
Perkinsus marinus and the Apicomplexa both have histones while the dinoflagellates appear to have lost theirs.[10]
Chromerida are ancestrally myzocytotic, on the basis of evidence for myzocytosis by the chromerid Vitrella brassicaformis.[11]
References
Wikiwand - on
Seamless Wikipedia browsing. On steroids.
Remove ads