A new araucarian pollen cone with in situ Cyclusphaera Elsik from the Aptian of Patagonia, Argentina

doi:10.1016/J.CRETRES.2005.04.005

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A new araucarian pollen cone with in situ Cyclusphaera Elsik from the Aptian of Patagonia, Argentina

Journal Article•DOI•

A new araucarian pollen cone with in situ Cyclusphaera Elsik from the Aptian of Patagonia, Argentina

Georgina M. Del Fueyo, Sergio Archangelsky

01 Oct 2005-Cretaceous Research (Academic Press)-Vol. 26, Iss: 5, pp 757-768

TL;DR: A new araucarian pollen cone Alkastrobus peltatus gen. et sp.

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About: This article is published in Cretaceous Research.The article was published on 2005-10-01. It has received 41 citations till now. The article focuses on the topics: Pollen & Araucariaceae.

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Journal Article•

羟氨苄青霉素引起大疱性类天疱疮样疹

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Yonghongzhai Lu

15 Nov 1992-International Journal of Dermatology and Venereology

2,147 citations

Journal Article•DOI•

Splendid and Seldom Isolated: The Paleobiogeography of Patagonia

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Peter Wilf, N. Rubén Cúneo¹, Ignacio H. Escapa¹, Diego Pol¹, Michael O. Woodburne² - Show less +1 more•Institutions (2)

National Scientific and Technical Research Council¹, Museum of Northern Arizona²

03 Jun 2013-Annual Review of Earth and Planetary Sciences

TL;DR: The idea that South America was an island continent over most of the Cenozoic, during which its unusual mammalian faunas evolved in isolation, is outstandingly influential in biogeography as discussed by the authors.

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Abstract: The idea that South America was an island continent over most of the Cenozoic, during which its unusual mammalian faunas evolved in isolation, is outstandingly influential in biogeography. Although large numbers of recent fossil discoveries and related advances require that the original isolation concept be significantly modified, it is still repeated in much current literature. The persistence of the idea inspired us to present here an integrated paleobiogeographic account of mammals, reptiles, and plants from the Jurassic to the Paleogene of Patagonia, which has by far the richest fossil record on the continent. All three groups show distribution patterns that are broadly consistent with South America's long separation history, first from Laurasia by the Late Jurassic, then from Africa and India-Madagascar during the late Early Cretaceous, and finally from Antarctica and Australia during the early-middle Eocene, after which “isolation” finally commenced. We highlight areas of promising future research a...

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123 citations

Cites background from "A new araucarian pollen cone with i..."

...F or p er so na l u se o nl y. Cyclusphaera type (Del Fueyo & Archangelsky 2005), which is of great biogeographic interest because it is widespread in Cretaceous strata of Gondwana including Africa, India, and the Antarctic Peninsula, as well as many sites in South America (Volkheimer 1980, Del…...
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...Several authors (e.g., Volkheimer 1980, McLoughlin 2001, Del Fueyo & Archangelsky 2005, Archangelsky & Del Fueyo 2010) have recognized a large floral province throughout southwestern Gondwana—i.e., Patagonia to mid– South America, southern Africa, and the Antarctic Peninsula—that is primarily based…...
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...…which is of great biogeographic interest because it is widespread in Cretaceous strata of Gondwana including Africa, India, and the Antarctic Peninsula, as well as many sites in South America (Volkheimer 1980, Del Fueyo & Archangelsky 2005, Archangelsky & Del Fueyo 2010, Del Fueyo et al. 2012)....
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Journal Article•DOI•

Araucariaceae (Pinopsida): Aspects in palaeobiogeography and palaeobiodiversity in the Mesozoic

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Lutz Kunzmann

04 Dec 2007-Zoologischer Anzeiger – A Journal of Comparative Zoology

TL;DR: Information on the origin of the family and oldest fossil records of the present-day genera are assembled, and existing models on phylogenetic relationships within the family inferred from molecular data are compared with relationships between the genera determined from morphological data.

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Abstract: The paper examines recent information on the history of the ‘southern hemisphere’ conifer family Araucariaceae and gives supplementary notes to previously published monographs. Important data from the Mesozoic fossil record are presented and summarized to describe the ancient diversity and distribution of Araucariaceae. Information on the origin of the family and oldest fossil records of the present-day genera are assembled. Existing models on phylogenetic relationships within the family inferred from molecular data are compared with relationships between the genera determined from morphological data. Reasons for disappearance of representatives of this conifer family in the latest Cretaceous in North America and Europe are briefly discussed.

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83 citations

Cites background from "A new araucarian pollen cone with i..."

...Araucariacites Cookson ex Couper, 1953, Balmeiopsis Archangelsky, 1979 (Archangelsky 1994; Batten and Dutta 1997), Cyclusphaera Elsik, 1966 (del Fueyo and Archangelsky 2005) and Dilwynites Harris, 1965 (Chambers et al. 1998) are pollen morphgenera derived from fossil representatives of the family....
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...Araucariacites, Balmeiopsis and Cyclusphaera are found inside microsporangia (del Fueyo and Archangelsky 2005), e.g., Cyclusphaera in Alkastrobus peltatus del Fueyo and Archangelsky, 2005....
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...They have been found partly inside of pollen cones or isolated microsporangia (e.g., Barale 1992; del Fueyo and Archangelsky 2005)....
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Journal Article•DOI•

Polar forests on the edge of extinction: what does the fossil spore and pollen evidence from East Antarctica say?

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E.M. Truswell¹, Michael Macphail¹•Institutions (1)

Australian National University¹

30 Apr 2009-Australian Systematic Botany

TL;DR: The combined evidence points to the collapse of taller woody ecosystems during the Eocene–Oligocene transition and their replacement by tundra-like or fell-field vegetation during the Oligocene and Neogene, broadly synchronous across the continent.

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Abstract: Diverse pollen and spore assemblages, spanning the Late Eocene preglacial–glacial transition, have been recovered from Ocean Drilling Program cores from Prydz Bay, East Antarctica. These microfloras are mostly in situ and provide an unparalleled record of terrestrial plant communities growing in Antarctica during the earliest stages of ice-cap formation. The evidence provides a basis for assessing the phytogeographic relationships of the Antarctic floras with other high-latitude floras in the southern hemisphere, including possible migration routes for some taxa. Preliminary studies (Macphail and Truswell 2004a) suggested the Late Eocene vegetation at Prydz Bay was floristically impoverished rainforest scrub, similar to Nothofagus–gymnosperm communities found near the climatic treeline in Patagonia and Tasmania. Re-evaluation of the microfloras indicates the diversity of shrubs, especially Proteaceae, was underestimated and the Late Eocene vegetation was a mosaic of dwarfed (krumholtz) trees, scleromorphic shrubs and wetland herbs, analogous to the taiga found in the transition zone between the boreal conifer forest and tundra biomes across the Arctic Circle. Microfloras similar to although much less diverse than the Prydz Bay assemblages occur in coreholes from the Ross Sea region on the opposite side of Antarctica. Interpretation of the latter is complicated by reworking and low yields but the combined evidence points to the collapse of taller woody ecosystems during the Eocene–Oligocene transition and their replacement by tundra-like or fell-field vegetation during the Oligocene and Neogene. This temperature-forced regression seems to have been broadly synchronous across the continent. The high-palaeolatitude location (~70°S) means that the Prydz Bay flora was adapted to several months of winter darkness and short-summer growing seasons. The nearest living relatives of identifiable woody taxa suggest year-round high humidity, with an annual precipitation between ~1200 and 1500 mm. Palaeotemperatures are more difficult to quantify although the inferred humid microtherm climate is consistent with mean annual temperatures less than 12°C and freezing winters.

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67 citations

Journal Article•DOI•

Araucariaceae macrofossil record from South America and Antarctica

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Carolina Panti, Roberto Roman Pujana, María del Carmen Zamaloa¹, Edgardo J. Romero¹•Institutions (1)

Facultad de Ciencias Exactas y Naturales¹

22 Feb 2012-Alcheringa

TL;DR: Araucariaceae fossils are abundant in Patagonia and on Seymour (Marambio) and King George (25 de Mayo) islands, Antarctica, and the oldest reliable macrofossil records in South America and Antarctica are from the Early Jurassic as mentioned in this paper.

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Abstract: Araucariaceae fossils are abundant in Patagonia and on Seymour (Marambio) and King George (25 de Mayo) islands, Antarctica. Araucariacean macrofossil suites are represented by records of 121 woods, leaves, ovuliferous scales, cones, one seed and seedlings, many of them placed in 50 formalized morphospecies. Although Araucariaceae fossil pollen is known since the Triassic, the oldest reliable macrofossil records in South America and Antarctica are from the Early Jurassic. In the Early Cretaceous, the family reached its widest distribution, with records from northern South America (cones and leaves from Colombia and Brazil). In the Late Cretaceous, the abundance of Araucariaceae began to decline. In the Cenozoic, all the fossils are derived from Patagonia and Antarctica, and this probably reflects a genuine contraction in the family's distribution.

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59 citations

Cites background from "A new araucarian pollen cone with i..."

...Del Fueyo & Archangelsky (2005) described Alkastrobus peltatus, an anatomically preserved male cone with peltate microsporangia bearing pollen of Cyclusphaera Elsik, 1966 type from the same unit....
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References

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Open Access

More filters

Journal Article•

羟氨苄青霉素引起大疱性类天疱疮样疹

[...]

Yonghongzhai Lu

15 Nov 1992-International Journal of Dermatology and Venereology

2,147 citations

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TL;DR: In this article, the authors present a location map of the Mesozoic Postscript References Systematic index Geographic index, Phytogeography, palaeoclimates and position of continents.

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Abstract: Preface to Russian edition Preface to English edition English editor's preface Location map 1. Introduction 2. Jurassic floras 3. Early Cretaceous floras 4. Late Cretaceous floras 5. Phytogeography, palaeoclimates and position of continents in the Mesozoic Postscript References Systematic index Geographic index.

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"A new araucarian pollen cone with i..." refers background in this paper

...Within this group, similar peltate microsporophylls with numerous elongate pollen sacs are characteristic of the Araucariaceae (Chamberlain, 1935)....
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