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Scientific classification
Domain: Eukaryota
(unranked): Archaeplastida
Kingdom: Viridiplantae
(unranked): Streptophyta
Division: Charophyta
Class: Mesostigmatophyceae
Marin & Melkonian, 1999
Order: Mesostigmatales Cavalier-Smith 1998
Family: Mesostigmataceae Moestrup & Throndsen 1988
Genus: Mesostigma Lauterborn 1894 emend. McCourt 2005
  • M. grande Korshikov 1938
  • M. viride Lauterborn 1894

The Mesostigmatophyceae are a monotypic class of green algae[1] found within the division charophyta that contains two species.[2]

Earlier studies were unable to resolve the position of the species, and it was often placed as a sister to all other green algae, as one of the basal members of the Streptophyta, or as close to Chaetosphaeridium.[3][4][5] More recent studies agree that Mesostigma and Chlorokybus form a clade, being the earliest diverging charophytes.[6][7]


  1. ^ Leliaert, Frederik; Verbruggen, Heroen; Zechman, Frederick W. (2011). "Into the deep: New discoveries at the base of the green plant phylogeny". BioEssays. 33 (9): 683–692. doi:10.1002/bies.201100035. ISSN 0265-9247. PMID 21744372. 
  2. ^ Guiry, M.D. & Guiry, G.M. (2007). "Class: Mesostigmatophyceae taxonomy browser". AlgaeBase version 4.2 World-wide electronic publication, National University of Ireland, Galway. Retrieved 2007-09-23. 
  3. ^ Marin B, Melkonian M (1999). "Mesostigmatophyceae, a new class of streptophyte green algae revealed by SSU rRNA sequence comparisons". Protist. 150 (4): 399–417. doi:10.1016/S1434-4610(99)70041-6. PMID 10714774. 
  4. ^ Jeffrey D. Palmer, Douglas E. Soltis and Mark W. Chase (2004). "The plant tree of life: an overview and some points of view". American Journal of Botany. 91 (10): 1437–45. doi:10.3732/ajb.91.10.1437. PMID 21652302. 
  5. ^ Andreas Simon, Gernot Glöckner, Marius Felder, Michael Melkonian and Burkhard Becker (2006). "EST analysis of the scaly green flagellate Mesostigma viride (Streptophyta): Implications for the evolution of green plants (Viridiplantae)". BMC Plant Biology. 6: 2. doi:10.1186/1471-2229-6-2. PMC 1413533Freely accessible. PMID 16476162. 
  6. ^ Lemieux C, Otis C, Turmel M (2007). "A clade uniting the green algae Mesostigma viride and Chlorokybus atmophyticus represents the deepest branch of the Streptophyta in chloroplast genome-based phylogenies". BMC Biol. 5: 2. doi:10.1186/1741-7007-5-2. PMC 1781420Freely accessible. PMID 17222354. 
  7. ^ Becker, B. & Marin, B. (2009). "Streptophyte algae and the origin of embryophytes". Annals of Botany. 103 (7): 999–1004. doi:10.1093/aob/mcp044. PMC 2707909Freely accessible. PMID 19273476 

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