Freshwater Algae of North America
Status: extant
   Class Zygnematophyceae C.Hoek, D.G.Mann & H.M. Jahns (1995), nom. inval. - conjugating green algae see Class Zygnematophyceae Round ex Guiry (2013)
  Status: extant
     Order Desmidiales - placoderm desmids
    Status: extant
       Family Desmidiaceae Kützing ex Ralfs (1845)
      Status: extant
         Genus Sphaerozosma Ralfs (1848)
        Status: extant
           Sphaerozosma laeve (Nordst.) Thomasson
          Status: extant
             1 Sphaerozosma laeve var. micracanthum (Nordst.) Thomasson
            Status: extant