The Mesostigmatophyceae are a class of basal green algae found in freshwater.[3][4][5] In a narrow circumscription, the class contains a single genus, Mesostigma.[6]AlgaeBase then places the order within its circumscription of Charophyta.[1] A clade containing Chlorokybus and Spirotaenia may either be added,[7][8][9][10][11][12] or treated as a sister, with Chlorokybus placed in a separate class, Chlorokybophyceae.[13] When broadly circumscribed, Mesostigmatophyceae may be placed as sister to all other green algae, or as sister to all Streptophyta.[14][15][16]
^ abGuiry, M.D.; Guiry, G.M. "Mesostigmatophyceae". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.
^Marin, B. & Melkonian, M. (1999). Mesostigmatophyceae, a new class of streptophyte green algae revealed by SSU rRNA sequence comparisons. Protist 150: 399-417, 9 figs, 2 tables.
^Irisarri, Iker; Darienko, Tatyana; Pröschold, Thomas; Fürst-Jansen, Janine M. R.; Jamy, Mahwash & de Vries, Jan (2021). "Unexpected cryptic species among streptophyte algae most distant to land plants". Proceedings of the Royal Society B: Biological Sciences. 288 (1963): 20212168. doi:10.1098/rspb.2021.2168. PMC8611356. PMID34814752.