Reconstruction and Phylogenetic Significance of a New Equisetum Linnaeus Species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)

  title={Reconstruction and Phylogenetic Significance of a New Equisetum Linnaeus Species from the Lower Jurassic of Cerro Bayo (Chubut Province, Argentina)},
  author={Andr{\'e}s Elgorriaga and Ignacio H. Escapa and Benjamin Bomfleur and Rub{\'e}n C{\'u}neo and Eduardo G. Ottone},
Abstract. We describe Equisetum dimorphum sp. nov. from the Lower Jurassic of Chubut Province, Patagonia, Argentina. This new species Is based on fertile and vegetative remains preserved as Impressions of stems, leaves, strobili, transversal sections of the stems showing their anatomy, and terminal pagoda-like structures. The fine-grained sedimentary matrix also preserved detailed Impressions of epidermal features. The morphological characters allow a whole-plant reconstruction and assignment… 
The equisetalean Iberisetum wegeneri gen. nov., sp. nov. from the Upper Pennsylvanian of Portugal
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Origin of Equisetum: Evolution of horsetails (Equisetales) within the major euphyllophyte clade Sphenopsida.
A combined approach to parsimony phylogenetic analyses to address relationships of 43 equisetalean species using a combination of morphological and molecular characters provides useful tests of hypotheses about overall phylogenetic relationships of euphyllophytes and foundations for future tests of molecular dates with paleontological data.
New fossil material of Equicalastrobus (Equisetales) and associated leaves from the Late Triassic of Baojishan basin, Gansu Province, China
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Sphenopsid remains from Grojec clays collected and described by Raciborski in 1894 are re-examined for the first time and supplemented by RacIBorski’s unpublished material housed at the Jagiellonian University (Institute of Botany) and by Stur's preliminarily described material stored at the Geological Survey of Austria.
Biogeography and genome size evolution of the oldest extant vascular plant genus, Equisetum (Equisetaceae).
The most extensive phylogenetic analysis to date is used as a framework to evaluate Horsetails' age, biogeography and genome size evolution, finding that differences in genome size between subgenera may be related to the number of sperm flagellae.
Fossil flora of Middle Jurassic Grojec clays (southern Poland). Raciborski’s original material reinvestigated and supplemented. II. Pteridophyta. Osmundales
Abstract In the second part of the series dealing with the flora of the Grojec clays (Poland, Middle Jurassic), macroremains of Osmundales are introduced. The re-examined and supplemented material
Two fossilized swamps containing in situ Sphenophyta stems, rhizomes, and root systems from the Middle Jurassic Hojedk Formation, Kerman area (Iran)
Sphenophytes often occur in wet environments; examples include the many extant equisetaleans that grow along streams, lake banks, and marshes. In the northern part of Kerman Province in Central Iran,
The Oligocene Equisetum from Qaidam Basin, Northeastern Tibetan Plateau in China and its implications
ABSTRACT Equisetum (Equisetaceae, Equisetales) is widely distributed around the world and distinguished by obviously jointed stems with longitudinal ridges or furrows. Recently, fossil materials


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E. thermale supports the hypothesis of a Mesozoic origin for the crown group of Equisetum, because it is preserved in situ with intact anatomy and provides clear paleoecological, biological, plus inferred paleoECophysiological evidence of adaptations known in extant species.
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Three types of anatomically preserved vegetative shoots with features that characterize crown group Equisetum have been discovered in Lower Cretaceous deposits (≈136 Ma) of British Columbia, Canada,
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The Equisetum crown group appears to have diversified in the early Cenozoic, whereas theEquisetaceae total group is estimated to have a Paleozoic origin, in remarkable agreement with current interpretations of the fossil record.
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It appears that essentially modern marattioid ferns, including Marattiopsis, which are commonly considered to be typical elements of tropical areas of the northern hemisphere during the Mesozoic, may have left an important but largely ignored fossil record in subtropical Gondwana.
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Sphenophytes are a common floral element in the Triassic of Gondwana. Most sphenophyte compression fossils have been conventionally assigned to a few, presumably very widespread species of
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