Pteridospermatophyta
Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous Period, though Komlopteris seem to have survived into Eocene times, based on fossil finds in Tasmania.[3] With regard to the enduring utility of this division, many palaeobotanists still use the pteridosperm grouping in an informal sense to refer to the seed plants that are not angiosperms, coniferoids (conifers or cordaites), ginkgophytes (ginkgos or czekanowskiales), cycadophytes (cycads or bennettites), or gnetophytes.Also, from a purely curatorial perspective the term pteridosperms is a useful shorthand for describing the fern-like fronds that were probably produced by seed plants, which are commonly found in many Palaeozoic and Mesozoic fossil floras.The concept of pteridosperms goes back to the late 19th century when palaeobotanists came to realise that many Carboniferous fossils resembling fern fronds had anatomical features more reminiscent of the modern-day seed plants, the cycads.In 1899 the German palaeobotanist Henry Potonié coined the term "Cycadofilices" ("cycad-ferns") for such fossils, suggesting that they were a group of non-seed plants intermediate between the ferns and cycads.
PreꞒDevonianEoceneNeuropterisMedullosalesCarboniferousLepidopterisPeltaspermalesScientific classificationPlantaeTracheophytesSpermatophytesCalamopityalesCallistophytalesCaytonialesGigantopteridalesGlossopteridalesLyginopteridalesCorystospermalesflowering plantsCycadalesGinkgoalesPinophytaGnetophytaBennettitalesCzekanowskialesCordaitalesSynonymspolyphyleticseed-producing plantslyginopteridsPermianMesozoicCretaceousKomlopterisTasmaniadivisionangiospermsconiferoidscordaitesginkgophytescycadophytesbennettitesgnetophytesDicroidiumCorystospermales/UmkomasialespalaeobotanistscycadsHenry PotoniéFrank OliverDukinfield Henry ScottMarie StopesLyginopterisLagenostomaDicksonitestransitional fossilsCorystospermaceaeparaphyleticovulesphylogeneticPentoxylalesnom. nud.LyginopteridaceaeMoresnetiaceaeincertae sedisconiferophyteErdtmanithecalesNilssonialescycadopsidsSanmigueliaPtilozamitesBibcodeArchaeplastidaPlantae s.l.DomainDiaphoretickesAmorpheaPicozoaPicomonasRhodelphidiaRhodelphisRhodophytaCyanidiophyceaeProteorhodophytinaPorphyridiophyceaeStylonematophyceaeCompsopogonophyceaeRhodellophyceaeEurhodophytinaBangiophyceaeFlorideophyceaeGlaucophytaGlaucocystophyceaeAlgospongiaViridiplantaePlantae s.s.green algaePrasinodermophytaPrasinodermophyceaePalmophyllophyceaeChlorophytaMamiellophyceaePyramimonadophyceaeNephroselmidophyceaePicocystophyceaeChloropicophyceaePedinophyceaeChlorodendrophyceaeUTC cladeUlvophyceaeTrebouxiophyceaeChlorophyceaeStreptophytaMesostigmatophyceaeChlorokybophyceaeSpirotaeniaKlebsormidiophyceaePhragmoplastophytaCharophyceaeColeochaetophyceaeZygnematophyceaeEmbryophytaEmbryophytesPlantae sensu strictissimoBryophytesMarchantiophyta