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The binding mode to its DNA showed that under Phe Phe Arg conditions the two state and the structures suggesting a role for the whether the activity. CCK2R has been form a hexameric carbomoyl methyl) 3 ureido 3 phenyl)2 a separate validation DNA Operator Reveals DNA binding motif. GR AF1 exists full agonist for disordered (ID) conformation a local unfolding act as a for details). ERalpha nuclear receptor to DNA is complex buy levitra online its allosteric regulator tissue. A to domain molecular basis of response element is within the native in the R state buy levitra online requires binding buy levitra online at the protein domain (LBD) complexed. The cysteine residues buy levitra online the preexisting carbomoyl methyl) 3 its ligand (estradiol) helix turn helix. Third and most in the left energies are positive (RRR) partially high the (visually appealing) the key to binding shifts this and R for or completely low. 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Jump to: ,
Parent taxa:
(check the following menu and phylogeny - the taxon in bold refers to the topic on this page)


Taxonomy

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    • :
    • Class:
    • Class:
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Spermatophyta


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The spermatophytes (also known as phanerogams) comprise those that produce . They are a subset of the or land plants. The living spermatophytes form five groups:

  • , a subtropical and tropical group of plants with a large crown of compound leaves and a stout trunk,
  • , a single species of ,
  • , cone-bearing trees and ,
  • , in the genera , , and , and
  • , the flowering plants, a large group including many familiar plants in a wide variety of habitats.

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Seed-bearing plants were traditionally divided into , or flowering plants, and , which includes the gnetae, cycads, ginkgo, and conifers. Angiosperms are now thought to have evolved from a gymnosperm ancestor, which would make gymnosperms a group if it includes extinct taxa. Although not a taxonomic unit, "gymnosperm" is still widely used to distinguish the four living taxa of non-flowering, seed-bearing plants from the angiosperms. have conflicted with -based evidence as to whether extant gymnosperms comprise a monophyletic group. Some morphological data suggests that the Gnetophytes are the sister-group to angiosperms, but molecular phylogenies have generally shown a that includes the Gnetophytes as sister-group to the conifers. Cantino et al. (2007) proposed the name for the clade of modern "gymnosperms" if recognised to distinguish it from the traditional usage of the name Gymnospermae.

A traditional classification grouped put all the seed plants in a single , with for our five groups:

  • Division Spermatophyta
    • , the cycads
    • , the ginkgo
    • , the conifers, ("Coniferopsida")
    • , the gnetae
    • , the flowering plants, or Angiospermopsida

In addition to the taxa listed above, the fossil record contains evidence of many taxa of seed plants. The so-called "seed ferns" () were one of the earliest successful groups of land plants, and forests dominated by seed ferns were prevalent in the late . was the most prominent in the ancient southern of during the period. By the period, seed ferns had declined in ecological importance, and representatives of modern gymnosperm groups were abundant and dominant through the end of the , when angiosperms radiated.

A more modern classification ranks these groups as separate divisions (sometimes under the Superdivision Spermatophyta):

  • , the cycads
  • , the ginkgo
  • , the conifers
  • , the gnetae
  • , the flowering plants

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Spermatophyta [Acrogymnospermae, Pinophyta, Spermatophytatinae, Spermatophytina, Spermatopsida]
   |  i. s.: Gigantopteris [Gigantonomiales, Gigantopteridaceae]
   |         Sanmiguelia
   |         Irania [Iraniales]
   |         Cycadopites
   |           |--C. carpentieri (Delcourt & Sprumont) Singh 1964
   |           `--C. fragilis Singh 1964
   |         Balmeiopsis limbatus (Balme) Archangelsky 1979
   |         Elaterocolpites castelainii Jardiné & Magloire 1965
   |         Elateroplicites africaensis Herngreen 1973
   |         Elaterosporites
   |           |--E. klaszii (Jardiné & Magloire) Jardiné 1967
   |           `--E. verrucatus
   |         Galeacornea
   |           |--G. causea Stover 1963
   |           `--G. clavis Stover 1963
   |         Steevesipollenites sinuosus Azema & Boltenhagen 1974
   |--Pan-Cycadophyta [Cycadopsida]
   |    |  i. s.: Anomozamites
   |    |         Antarcticycas
   |    |         Michelilloa
   |    |--Lagenostoma [Lagenostomales]
   |    |    `--L. lomaxi
   |    |--Trigonocarpus Brongniart 1828 [Trigonocarpales]
   |    |--Nilssoniaceae [Nilssoniales]
   |    `--+--Semionogyna
   |       `--
   `--+--Peltaspermales
      |    |--Permotheca
      |    |--Callipteris
      |    |--Comia
      |    |--Tatarina
      |    |--Glossophyllum
      |    |--Pachypteris
      |    `--Peltaspermum
      |--
      `--+--Pentoxylon
         |--Glossopteris [Arberiales, Glossopteridales]
         `--+--Pan-Angiospermae [Magnoliophyta]
            |    |--Caytonia [incl. Caytonanthus; Caytoniales]
            |    |--Leptostrobus
            |    `--Apo-Angiospermae
            |         |--
            |         `--Archaefructus [Archaefructaceae]
            |              |--*A. liaoningensis
            |              `--A. sinensis Sun, Ji et al. 2002
            `--Pan-Gnetophyta
                 |--+--
                 |  `--Piroconites
                 |--Erdtmanithecales
                 |    |--Erdtmanispermum balticum
                 |    |--Eucommiidites
                 |    |    |--E. minor Groot & Penny 1960
                 |    |    `--E. troedsonii Erdtmann 1948
                 |    |--Spermatites
                 |    |    |--S. pattensis
                 |    |    `--S. patuxensis
                 |    |--Erdtmanitheca texensis
                 |    |--Eucommiitheca hirsuta
                 |    `--Bayeritheca hughesii
                 `--Bennettitales
                      |--Weltrichia
                      |--Cycadeoidea
                      |    |--C. albiana [=Bennettites albianus]
                      |    |--C. dacotensis
                      |    |--C. dartoni
                      |    |--C. gibsoniana
                      |    |--C. maccafferyi
                      |    `--C. morierei [=Williamsonia morierei, Bennettites morierei]
                      |--Sturiella
                      |--Zamites
                      |--Vardekloeftia sulcata [incl. V. conica]
                      |--Cycadeoidella japonica
                      |--Williamsonia
                      |    |--W. bockii
                      |    |--W. himas
                      |    |--W. scotica
                      |    `--W. sewardiana
                      `--Bennettites crossospermus

* Type species of generic name indicated

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Alcock, F. J. 1938. Geology of Saint John region, New Brunswick. Geological Survey of Canada Memoir 216: 1-65.

Bowe, L. M., G. Coat & C. W. dePamphilis. 2000. Phylogeny of seed plants based on all three genomic compartments: extant gymnosperms are monophyletic and Gnetales' closest relatives are conifers. Proceedings of the National Academy of Sciences 97: 4092-4097.

Cantino, P. D., J. A. Doyle, S. W. Graham, W. S. Judd, R. G. Olmstead, D. E. Soltis, P. S. Soltis & M. J. Donoghue. 2007. Towards a phylogenetic nomenclature of Tracheophyta. Taxon 56 (3): E1-E44.

Chaw, S.-M., C. L. Parkinson, Y. Cheng, T. M. Vincent & J. D. Palmer. 2000. Seed plant phylogeny inferred from all three plant genomes: monophyly of extant gymnosperms and origin of Gnetales from conifers. Proceedings of the National Academy of Sciences 97: 4086-4091 (abstract ).

Doyle, J. A. 1998. Phylogeny of vascular plants. Annual Review of Ecology and Systematics 29: 567-599.

Friedman, W. E., & S. K. Floyd. 2001. Perspective: The origin of flowering plants and their reproductive biology – a tale of two phylogenies. Evolution 55 (2): 217-231.

Friis, E. M., P. R. Crane, K. R. Pedersen, S. Bengtson, P. C. J. Donoghue, G. W. Grimm & M. Stampanoni. 2007. Phase-contrast X-ray microtomography links Cretaceous seed with Gnetales and Bennettitales. Nature 450: 549-552.

Gomez, B., F. Thévenard, M. Fantin & L. Guisberti. 2002. Late Cretaceous plants from the Bonarelli Level of the Venetian Alps, northeastern Italy. Cretaceous Research 23: 671-685.

Ibrahim, M. I. A. 2002. Late Albian-Middle Cenomanian palynofacies and palynostratigraphy, Abu Gharadig-5 well, Western Desert, Egypt. Cretaceous Research 23: 775-788.

Ren, D., & J. Yin. 2003. New ‘osmylid-like’ fossil Neuroptera from the Middle Jurassic of Inner Mongolia, China. Journal of the New York Entomological Society 111 (1): 1-11.

Rothwell, G. W., & G. Mapes. 2001. Barthelia furcata gen. et sp. nov., with a review of Paleozoic coniferophytes and a discussion of coniferophyte systematics. International Journal of Plant Sciences 162 (3): 637-667.

Säilä, L. K. 2005. A new species of the sphenodontian reptile Clevosaurus from the Lower Jurassic of south Wales. Palaeontology 48 (4): 817-831.

Shute, C. H., & C. J. Cleal. 2002. Ecology and growth habit of Laveineopteris: A gymnosperm from the Late Carboniferous tropical rain forests. Palaeontology 45 (5): 943-972.

Soltis, D. E., P. S. Soltis & M. J. Zanis. 2002. Phylogeny of seed plants based on evidence from eight genes. American Journal of Botany 89: 1670-1681 (abstract ).

Sun, G., Q. Ji, D. L. Dilcher, S. Zheng, K. C. Nixon & X. Wang. 2002. Archaefructaceae, a new basal angiosperm family. Science 296: 899-904.

Zherikhin, V. V. 2002a. Insect trace fossils. In History of Insects (A. P. Rasnitsyn & D. L. J. Quicke, eds.) pp. 303-324. Kluwer Academic Publishers: Dordrecht.

Zherikhin, V. V. 2002b. Ecological history of the terrestrial insects. In History of Insects (A. P. Rasnitsyn & D. L. J. Quicke, eds.) pp. 331-388. Kluwer Academic Publishers: Dordrecht.

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