Freshwater Algae of North America
   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
       Family Gonatozygaceae
         Genus Gonatozygon de Bary (1856)
           1 Gonatozygon brebissonii de Bary
           2 Gonatozygon kinahani (Archer) Rabenh.
           3 Gonatozygon monotaenium de Bary
           4 Gonatozygon laeve Hilse