1 Class Synurophyceae Andersen (1987) see Class Chrysophyceae Fritsch (1927)
2.1.1 Genus Corethron Castrac. (1886)
2.1.2 "diatoms" see Class Bacillariophyceae Haeckel (1878)
2.2 Order "Parmales" B.C. Booth & H.J. Marchant (1987)