Kingdom Protoctista Hogg, 1860 Count: [p] 36p;91c;87o;183f;507g;35s;2v Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844) Count: [f] 4c;41o;83f;204g Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics Count: 20o;33f;85g Subclass Biddulphiophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004) Count: [f] 4o;4f;23g Order Hemiaulales Round & R.M. Crawford (1990) Count: [f] 1f;8g Family Hemiaulaceae Heib. (1863) Count: 8g 1 Genus Eucampia Ehrenb. (1839) Count: - 2 Genus Hemiaulus Heib. (1863) Count: - 3 Genus Climacodium Grunow (1868) Count: - 4 Genus Trinacria Heib. (1863) Count: - 5 Genus Riedelta see Genus Riedelia Jousé & Shesh.-Por. (1971), nom. illeg. Count: - 6 Genus Cerataulina H. Perag. ex F. Schütt (1896) Count: - 7 Genus Pseudorutilaria Grove & Sturt (1886) Count: - 8 Genus Baxteriopsis G. Karst. (1928) Count: -