Kingdom [Plantae] Haeckel (1866) - plants Division Pteridophyta Schimp. (1879) see Subphylum Pteridophytina (Eichler) Cavalier-Sm. (1998) Class †Trimerophytopsida A.S.Foster & Gifford (1974) [monotypic] Order †Trimerophytales Kasper, H.N. Andrews & W.H. Forbes (1974) [monotypic] Family †Trimerophytaceae Bierhorst (1971)