Class Conjugatophyceae Engl. (1892) see Class Zygnematophyceae Round ex Guiry (2013) Order Zygnematales - filamentous conjugates and saccoderm desmids Family Mesotaeniaceae Genus Netrium (Nägeli) Itzigs. & Rothe (1856) Netrium digitus (Ehrenb.) Itzigs.