Class Conjugatophyceae Engl. (1892) see Class Zygnematophyceae Round ex Guiry (2013)
   Order Zygnematales - filamentous conjugates and saccoderm desmids
     Family Zygnemataceae (Meneghini) Kützing (1843)
       Genus Lloydina A. Ahmad & M. Goldstein (1972) [monotypic]
         1 Lloydina kankensis (Ahmad & Goldstein) Ahmad & Goldstein