Lub tswv yim ntawm pteridosperms rov qab mus rau kawg xyoo pua 19 thaum palaeobotanists tuaj paub tias ntau cov Carboniferous fossils zoo li fern fronds muaj anatomical nta ntau reminiscent ntawm niaj hnub cov noob nroj tsuag., cov cycads.
Pteridosperms tau ploj mus thaum twg?
Qee yam ntawm cov noob qoob loo qub tshaj plaws yog rau pteridosperms. Thaum lub sij hawm Carboniferous thiab Permian, noob ferns yog ib qho tseem ceeb ntawm cov nroj tsuag. Thaum lub sij hawm Mesozoic, txawm li cas los xij, lawv cov lej tau poob qis thiab kawg ntawm Cretaceous feem ntau pteridosperms tau ploj mus.
Thaum twg cov noob ferns tshwm sim?
Cov fossil cog Elkinsia polymorpha, "cov noob fern" los ntawm lub sijhawm Devonian-kwv yees li 400 lab xyoo dhau los-yog suav tias yog cov noob qoob loo ntxov tshaj plaws paub txog hnub no.
Yuav ua li cas cog noob qoob loo thaum ub?
Cov noob qoob loo qub tshaj plaws yog Elkinsia polymorpha, "cov noob fern" los ntawm Late Devonian (Famennian) ntawm West Virginia. Txawm hais tias cov fossils tsuas muaj cov noob me me xwb, cov kab no tau khaws cia zoo heev.
thawj cov noob qoob loo yog dab tsi?
Seed ferns yog thawj cov noob nroj tsuag, tiv thaiv lawv qhov chaw yug me nyuam hauv cov qauv hu ua cupules. Cov noob ferns tau nce mus rau lub gymnosperms thaum lub sijhawm Paleozoic Era, txog 390 lab xyoo dhau los.
