Euphyllophytina

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Parent taxa:
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EMBRYOPHYTA
Taxonomy Phylogeny 
Chlorobionta
  |--Chlorophyta
  `--Charophyta
       `--Embryophyta
            |--Marchantiophyta
            |--Bryophyta
            |--Anthocerotophyta
            `--Tracheophyta
                 |--Lycopodiopsida
                 `--o--o--Equisetopsida
                    |  `--Pteridopsida
                    `--Spermatophytata


Euphyllophytina


The clade that unites oak trees and ferns is Euphyllophytina = Quercus + Equisetum. The two complementary stem clades are Moniliformopsida and Spermatophytata. Euphyllophytines are characterized (Kenrick & Crane, 1997) by monopodial or pseudomonopodial branching, helical arrangement of branches, small, pinnule-like vegetative branches, the branch apex is recurved or coiled, paired sporangia which split open along one side through a single slit, and radially-alligned xylem in the larger axes. Only early euphyllophytines have P-type tracheids. Kenrick & Crane identified this clade based entirely on morphological characters. However, Euphyllophytina has also been recovered, with essentially the same structure, using ssu rDNA (Duff & Nickrent, 1999).

[edit] References

  • Duff, RJ & DL Nickrent (1999), Phylogenetic relationships of land plants using mitochondrial small-subunit rDNA sequences. Amer. J. Bot. 86: 372-386.
  • Kenrick, P & PR Crane (1997), The Origin and Early Diversification of Land Plants: a Cladistic Study. Smithsonian Inst. Press, 441 pp.

[edit] Credits

ATW041216 (Palaeos com) Text public domain. No rights reserved.

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