Viridiplantae Cavalier-Smith, 1981 - green plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Streptophyta Jeffrey 1967 [Crane & Kenrick 1997], nom. cl. inval. see Infrakingdom Streptophyta Caval.-Sm. (1993)
     charophytes see Phylum Charophyta Migula (1889)
       Class Zygnematophyceae C.Hoek, D.G.Mann & H.M. Jahns (1995), nom. inval. - conjugating green algae see Class Zygnematophyceae Round ex Guiry (2013)
         Order Desmidiales - placoderm desmids
           1 Genus Micrasterias C.Agardh ex Ralfs (1848)
           2 Genus Closterium Nitzsch ex Ralfs (1848)
           3 Genus Cosmarium Corda ex Ralfs (1848)
           4 Genus Staurastrum Meyen ex Ralfs (1848)
           5 Genus Gonatozygon de Bary (1856)