living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020] Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925 Kingdom Plantae Haeckel (1866) - plants Subkingdom Embryobionta Cronquist, Takht. & W.Zimm. Division Equisetophyta D.H.Scott (1900) see Phylum Equisetophyta D.H.Scott (1900) 1 Class Equisetopsida C.Agardh (1825) - horsetails see Subclass Equisetidae Warm. (1883) 1 Subdivision Equisetopsida Agardh (1825) see Class Sphenopsida