Class Conjugatophyceae Engl. (1892) see Class Zygnematophyceae Round ex Guiry (2013)
Count: [g†g] 2o;6f;79g; †6g [3 Feb 2020]
   Genus Polysolenia C.G. Ehrenberg ex F.T. Kützing (1849), incertae sedis
  Count: -