Viridiplantae Cavalier-Smith, 1981 - green plants see Subkingdom Viridiplantae Caval.-Sm. (1981)
   Chlorophyta Pascher (1914) - green algae
     core chlorophytes
       Class Ulvophyceae K.R. Mattox & K.D. Stewart (1984) - ulvophytes
         Oltmannsiellopsidales T. Nakayama, S. Watanabe & I. Inouye (1996)
           Genus Oltmannsiellopsis Chihara & I. Inouye (1986)