Holozoa
clade of organisms that includes animals and their closest single-celled relatives, but excludes fungi and all other organisms
Holozoa is a group of living things that includes animals, and some single-celled relatives of animals. It excludes fungi.[1][2][3][4] Holozoa is also an old name for the tunicate genus Distaplia.[5]
| Holozoa | |
|---|---|
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| Orange elephant ear sponge, Agelas clathrodes, in foreground. Two corals in the background: a sea fan, Iciligorgia schrammi, and a sea rod, Plexaurella nutans. | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Clade: | Amorphea |
| Clade: | Obazoa |
| (unranked): | Opisthokonta |
| (unranked): | Holozoa Lang et al., 2002 |
| Subgroups | |
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Holozoa is a clade: a group of plants or animals with a common ancestor. It has all organisms close to animals.[6]
An example of a well-known holozoan is the choanoflagellate, which looks a lot like the cells of a sponge. Proterospongia is an example of a choanoflagellate that might give clues as to how sponges evolved.
Evolution
changeThe phylogenic tree (evolution tree) below shows how clades broke into newer clades. This includes Holozoa.
| Opisthokonta |
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References
change- ↑ Aleshin VV, Konstantinova AV, Mikhailov KV, Nikitin MA, Petrov NB (December 2007). "Do we need many genes for phylogenetic inference?". Biochemistry Mosc. 72 (12): 1313–23. doi:10.1134/S000629790712005X. PMID 18205615. S2CID 12594007.
- ↑ Lang BF, O'Kelly C, Nerad T, Gray MW, Burger G (October 2002). "The closest unicellular relatives of animals". Curr. Biol. 12 (20): 1773–8. doi:10.1016/S0960-9822(02)01187-9. PMID 12401173. S2CID 14192333.
- ↑ Shalchian-Tabrizi, Kamran; Minge, Marianne A.; Espelund, Mari; Orr, Russell; Ruden, Torgeir; Jakobsen, Kjetill S.; Cavalier-Smith, Thomas; Aramayo, Rodolfo (7 May 2008). Aramayo, Rodolfo (ed.). "Multigene phylogeny of choanozoa and the origin of animals". PLOS ONE. 3 (5): e2098. Bibcode:2008PLoSO...3.2098S. doi:10.1371/journal.pone.0002098. PMC 2346548. PMID 18461162.
- ↑ Elias M, Archibald JM (August 2009). "The RJL family of small GTPases is an ancient eukaryotic invention probably functionally associated with the flagellar apparatus". Gene. 442 (1–2): 63–72. doi:10.1016/j.gene.2009.04.011. PMID 19393304.
- ↑ Tatiàn, Marcos; Antacli, Julieta Maria; Sahade, Ricardo (2005). "Ascidians (Tunicata, Ascidiacea): species distribution along the Scotia Arc". Scientia Marina. 69 (suppl. 2): 205–214. doi:10.3989/scimar.2005.69s2205.
- ↑ Steenkamp, Emma T.; Wright, Jane; Baldauf, Sandra L. (January 2006). "The Protistan Origins of Animals and Fungi". Molecular Biology & Evolution. 23 (1): 93–106. doi:10.1093/molbev/msj011. PMID 16151185.