Division Bacillariophyta Engl. & Gilg (1919) see Phylum Bacillariophyta Engl. & Gilg (1919) Count: 3c;45o;91f;291g;308s Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics Count: 22o;40f;122g;1s Subclass Coscinodiscophycidae Round & R.M. Crawford (1990) Count: [f] 11o;19f;33g Order Melosirales R.M. Crawford (1990) Count: [f] 4f;6g Family Hyalodiscaceae R.M. Crawford (1990) Count: 2g Genus Hyalodiscusᵀ Ehrenb. (1845) Count: -