Equisetopsida: Perbedaan antara revisi

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'''Equisetopsida''', atau '''Sphenopsida''' di kalangan [[paleobotani]], adalah salah satu [[Kelas (biologi)|kelas]] [[tumbuhan berpembuluh]] yang masih lestari hingga kini namun dengan temuan fosil berusia sampai ke kala [[Devon (periode)|Devon]]. Anggotanya yang banyak dikenal adalah [[paku ekor kuda]] (''Equisetum'')<ref>{{cite web | url = http://www.merriam-webster.com/cgi-bin/dictionary?book=Dictionary&va=horsetail | title = horsetail | work = Merriam-Webster Online Dictionary }}</ref><ref name="Allaby 1999">{{cite book|last= Allaby|first= Ailsa|author2=Michael Allaby|year= 1999|title= "Sphenopsida." A Dictionary of Earth Sciences }}</ref><ref name=Judd>{{cite book|last1=Judd|first1=W.S.|last2=Campbell|first2=C.S.|last3=Kellogg|first3=E.A.|last4=Stevens|first4=P.F.|last5=Donoghue|first5=M.J.|year=2002|title=Plant systematics, a phylogenetic approach.|publisher=Sinauer Associates, Inc.|location=Sunderland, Massachusetts|isbn=0878934030|page=193 }}</ref>. Kebanyakan anggotanya menyukai tempat yang becek / berair, dengan daun yang sangat tereduksi sehingga fotosintesis dilakukan oleh batang, yang umumnya beruas dan berbentuk berkas-berkas kaku.
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The Equisetopsida were formerly regarded as a separate [[division (biology)|division]] of spore plants and also called '''Equisetophyta''', '''Arthrophyta''' or '''Sphenophyta'''; today they have been recognized as rather close relatives of the typical ferns ([[Pteridopsida]]) and form a specialized lineage of the [[Pteridophyta]].<ref name="Smith 2006">{{cite journal | doi=10.2307/25065646 | last=Smith | first=Alan R.|author2=Kathleen M. Pryer |author3=Eric Schuettpelz |author4=Petra Korall |author5=Harald Schneider |author6=Paul G. Wolf | year=2006 | title= A classification for extant ferns | url=http://www.pryerlab.net/publication/fichier749.pdf | journal=Taxon | volume= 55 | issue=3 | pages= 705–731 | jstor=25065646 }}</ref>
The organisms first appear in the fossil record during the late Devonian,<ref name=Taylor_1993/> a time when land plants were undergoing a rapid diversification, with roots, seeds and leaves having only just evolved. (See [[Evolutionary history of plants]]) However, plants had already been on the land for almost a hundred million years, with the first evidence of land plants dating to {{Ma|475}}.<ref name="wellman2003">{{cite journal | title = Fragments of the earliest land plants | author = CH Wellman, PL Osterloff, U Mohiuddin | journal = Nature | volume = 425 | issue = 6955 | pages = 282–285 | year = 2003 | url = http://sherpa.leeds.ac.uk/archive/00000106/01/wellmanch1.pdf | pmid = 13679913 | doi = 10.1038/nature01884 }}</ref>
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== Klasifikasi ==
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