The Early Cretaceous Mesofossil Flora of Torres Vedras (Ne of Forte da Forca), Portugal:A Palaeofloristic Analysis of an Early Angiosperm Community

Autor: Kaj Raunsgaard Pedersen, Peter R. Crane, Else Marie Friis
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Selaginellaceae
fossil megaspores
Flora
Nematoda
Stratigraphy
Gnetopsida
Liliopsida
Selaginellales
mesofossil flora
fossil seeds
Austrobaileyales
Gnetales (awaiting allocation)
Amphibia
Magnoliales
Inoceramidae
Polypodiopsida
Plantae
Magnoliopsida (awaiting allocation)
Chordata
Ascaridida
Sergipea
Rhacophoridae
Alismatales
Poales
Coniferopsida
Geology
Biodiversity
Piperales
Cretaceous
Geography
Ephedraceae
Lycopodiopsida
Mollusca (awaiting allocation)
Schisandraceae
Anura
Aptian
Cyprinidae
Pinales
Poaceae
synchrotron radiation X-ray tomographic microscopy (SRXTM)
Magnoliopsida
Animalia
Myalinida
Ecology
Evolution
Behavior and Systematics
Taxonomy
Chloranthales
Chloranthaceae
Gnetales
Actinopterygii
fossil stamens
fossil flowers
Cosmocercidae
Paleontology
Pinopsida
Archaeology
Salviniales
Bivalvia
Secernentea
Tracheophyta
Cypriniformes
Mollusca
early eudicots
tricolpate pollen
Araucariaceae
Zdroj: Friis, E M, Crane, P R & Pedersen, K R 2019, ' The Early Cretaceous Mesofossil Flora of Torres Vedras (Ne of Forte da Forca), Portugal : A Palaeofloristic Analysis of an Early Angiosperm Community ', Fossil Imprint, vol. 75, no. 2, pp. 153-257 . https://doi.org/10.2478/if-2019-0013
Popis: An Early Cretaceous mesofossil flora is described from the lower part of the Almargem Formation (late Barremian-early Aptian) from Torres Vedras (NE of Forte da Forca), Portugal. The flora is the oldest mesofossil flora containing angiosperm remains to be described in detail based on well-preserved flower, fruit and seed remains. In addition to angiosperms, the mesofossil flora also includes megaspores, sporangia and tiny leaves of spore-bearing plants. There are also twigs, cone fragments and seeds of conifers and seeds assigned to the BEG group. In total about 100 species have been distinguished. Most abundant in terms of plant fragments identified, are spore-bearing plants and conifers. Although only about 18 % of the specimens can be attributed to angiosperms, angiosperm diversity is unexpected high considering the age of the flora. Angiosperms account for about 62 % of all species recognized. Angiosperm diversity is mainly at the level of ANA-grade angiosperms, eumagnoliids and in a few cases early diverging lineages of monocots. Eudicots are subordinate. Twenty new genera and 28 new species of angiosperms are established (Anaspermum operculatum gen. et sp. nov., Appofructus nudus gen. et sp. nov., Appomattoxia minuta sp. nov., Burgeria striata gen. et sp. nov., Canrightia elongata sp. nov., Choffaticarpus compactus gen. et sp. nov., Dejaxia brevicolpites gen. et sp. nov., Dinisia portugallica gen. et sp. nov., Eckhartia brevicolumella gen. et sp. nov., Eckhartia longicolumella sp. nov., Eckhartia intermedia sp. nov., Eckhartianthus lusitanicus gen. et sp. nov., Eckhartiopsis parva gen. et sp. nov., Gastonispermum antiquum sp. nov., Goczania rugosa gen. et sp. nov., Goczania inaequalis sp. nov., Goczania punctata sp. nov., Ibrahimia verminculata gen. et sp. nov., Juhaszia portugallica gen. et sp. nov., Kempia longicolpites gen. et sp. nov., Kvacekispermum costatum sp. nov., Mcdougallia irregularis gen. et sp. nov., Nicholsia brevicolpites gen. et sp. nov., Piercipollis simplex gen. et sp. nov., Reyanthus lusitanicus gen. et sp. nov., Samylinaea punctata gen. et sp. nov., Teebacia hughesii gen. et sp. nov., Vedresia elliptica gen. et sp. nov.). Comparison with results of a palynological study from the same horizon that yielded the mesofossil flora shows a marked underestimation of angiosperm diversity in the palynoflora, a pattern that has also been recognized elsewhere.
Databáze: OpenAIRE
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