Class Conjugatophyceae Engl. (1892) see Class Zygnematophyceae Round ex Guiry (2013)
Count: [g†g] 2o;6f;79g; †6g [3 Feb 2020]
   Order Desmidiales - placoderm desmids
  Count: 4f;46g
     1 Family Closteriaceae A. Pritch. (1872)
    Count: [g] 2g [3 Feb 2020]
     2 Family Desmidiaceae Kützing ex Ralfs (1845)
    Count: [g] 41g [3 Feb 2020]
     3 Family Gonatozygaceae
    Count: [g] 2g [3 Feb 2020]
     4 Family Peniaceae Haeckel (1894) [monotypic]
    Count: [g] 1g [3 Feb 2020]