Kingdom Protoctista Hogg, 1860 Phylum Bacillariophyta Engl. & Gilg (1919) - diatoms see [unranked] Diatomea Kütz. (1844) Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics Subclass Thalassiosirophycidae Round & R.M. Crawford (1990) see Class Mediophyceae Medlin & Kaczmarska (2004) Order Thalassiosirales Glezer & I.V. Makarova (1986) Family Sceletonemataceae Lebour (1930) see Family Skeletonemataceae M. Lebour (1930) Genus Sceletonema Grev. (1865) see Genus Skeletonema Grev. (1865)