Class Conjugatophyceae Engl. (1892) see Class Zygnematophyceae Round ex Guiry (2013) Order Zygnematales - filamentous conjugates and saccoderm desmids Family Zygnemataceae (Meneghini) Kützing (1843) Genus Mougeotiella Yamagishi (1963) Mougeotiella sphaerocarpa (Wolle) Yamagishi (1963)