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Temporal range: No fossils known, molecular clock evidence for origin 1050-800Ma[1]
Monosiga Brevicollis Phase.jpg
Scientific classification
Domain: Eukarya
(unranked) Opisthokonta
(unranked) Holozoa
(unranked) Filozoa
(unranked) Apoikozoa
Class: Choanoflagellatea


Sphaeroeca, a colony of choanoflagellates (about 230 individuals)

The choanoflagellates are a class or phylum of collared microscopic flagellate eukaryotes. Some species are single cells, some are multicellular. They do not have chloroplasts, and are heterotrophic. Some consider they form the simplest phylum of animals; others consider them to be protists.[3][4]

Related pages[change | change source]

References[change | change source]

  1. Wegener-Parfrey, Laura; Lahr DJ; Knoll AH; Katz LA. (August 16, 2011). "Estimating the timing of early eukaryotic diversification with multigene molecular clocks". PNAS 108 (33): 13624–13629. doi:10.1073/pnas.1110633108. PMC 3158185. PMID 21810989. 
  2. Barnes, Richard Stephen Kent (2001). The Invertebrates: A Synthesis. Wiley-Blackwell. p. 41. ISBN 978-0-632-04761-1.
  3. Leadbeater B.S.C. & Thomsen H. 2000. Order Choanoflagellida. In Lawrence (ed) An illustrated guide to the Protozoa 2nd ed, Society of Protozoologists.
  4. Carr M. et al. 2008. Molecular phylogeny of choanoflagellates, the sister group to Metazoa. PNAS 105: 16641–16646.