organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Eukaryota Chatton, 1925 - eukaryotes
     Kingdom Plantae Haeckel (1866) - plants
       Subkingdom Viridaeplantae Cavalier-Sm. (1981) - green plants see [unranked] Viridiplantae Cavalier-Smith, 1981
         Phylum Chlorophyta Pascher (1914) - green algae
           Class Charophyceae Rabenh. (1863) - stoneworts
             Order †Sycidiales K. Mädler (1952)
               1 Family †Sycidiaceae Karpinsky (1934)
               2 Family †Trochiliscaceae Karpinsky (1934)
               3 Family †Chovanellaceae Grambast (1962)
               4 Family †Pinnoputamenaceae Z. Wang & Lu (1980)