[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925 Class Coscinodiscophyceae Round & R.M. Crawford (1990) - radial centrics Subclass Coscinodiscophycidae Round & R.M. Crawford (1990) Order Melosirales R.M. Crawford (1990) Family Stephanopyxidaceae Nikolaev (1984) Genus Stephanopyxis (Ehrenb.) Ehrenb. (1845) Stephanopyxis turris (Grev.) Ralfs, in Pritchard (1861)