A5037214509- Plant Diversity and Evolution
- Plant and Fungal Species Descriptions
- Geology and Paleoclimatology Research
- Botanical Research and Applications
- Paleontology and Stratigraphy of Fossils
- Evolution and Paleontology Studies
- Fern and Epiphyte Biology
- Plant and animal studies
- Ecology and Vegetation Dynamics Studies
- Scarabaeidae Beetle Taxonomy and Biogeography
- Geological formations and processes
- Plant Taxonomy and Phylogenetics
- Plant Parasitism and Resistance
- Mycorrhizal Fungi and Plant Interactions
- Pleistocene-Era Hominins and Archaeology
- Leaf Properties and Growth Measurement
- Fossil Insects in Amber
- Geological and Geochemical Analysis
- Mediterranean and Iberian flora and fauna
- Study of Mite Species
- Allergic Rhinitis and Sensitization
- Lichen and fungal ecology
- Plant Ecology and Taxonomy Studies
- Medicine and Dermatology Studies History
- Forest Ecology and Biodiversity Studies
Bernardino Rivadavia Natural Sciences Museum
2015-2024
Consejo Nacional de Investigaciones Científicas y Técnicas
2014-2024
Centro Científico Tecnológico - San Juan
2023
Centro Científico Tecnológico - Tucumán
2018
National University of La Rioja
2014-2018
Servicio Geológico Minero Argentino
2018
Fundación Ciencias Exactas y Naturales
2018
University of Buenos Aires
2018
Instituto de Química del Noroeste Argentino
2017
Abstract Araucarioxylon Kraus is a widely known fossil‐genus generally applied to woods similar that of the extant Arau‐ cariaceae. However, since 1905, several researchers have pointed out this name an illegitimate junior nomenclatural synonym. At least four generic names are in current use for fossil wood type: Agathoxylon Hartig, , Dadoxylon Endl. and Dammaroxylon J. Schultze‐Motel. This problem inconsistent application compounded by fact type represent wide range plants including basal...
Araucariaceae fossils are abundant in Patagonia and on Seymour (Marambio) King George (25 de Mayo) islands, Antarctica. Araucariacean macrofossil suites represented by records of 121 woods, leaves, ovuliferous scales, cones, one seed seedlings, many them placed 50 formalized morphospecies. Although fossil pollen is known since the Triassic, oldest reliable South America Antarctica from Early Jurassic. In Cretaceous, family reached its widest distribution, with northern (cones leaves Colombia...
UV-curable acrylate are used as an easy, economic and rapid mounting media (m.m.). After the palynological specimens kept in water dehydrated with Ethanol, they can be mounted such Trabasil NR2 Acrysoft urethane acrylates. These m.m. have advantages over other m.m.: not displaced time, attacked by any organism or modified environmental conditions humidity heat. In addition refraction index is similar to that of sporopollenin glass.
Arrangement of tracheid radial pits is frequently superficially mentioned in extant gymnosperm wood anatomy descriptions. However, pitting arrangement a key character for delimiting fossil-genera and fossil-species woods. We propose two new indices measuring quantifying the fossil The first one, contiguity percentage index (Cp) indicates if pit rows are contiguous (=in contact or touching) with other above below borders, has values from 0 to 100%. second seriation (Si) an average given as...
A new species of Podocarpoxylon Gothan is described based on samples collected from sediments the Río Turbio Formation. The fossil-bearing strata are lower Eocene (47–46 Mya) according to recent geochronological ages. has indistinct growth ring boundaries, abundant and frequently tangentially zonate axial parenchyma, uniseriate pitting radial walls, one half-bordered pit (= oculipore) with reduced borders vertical aperture inclination per cross-field medium height rays. material compared all...
Conifer fossil woods represent 54% of an assemblage 116 specimens collected from sediments the Sobral Formation in Seymour (Marambio) Island, Western Antarctica. These are anatomically described detail and assigned to seven fossil-species following fossil-genera: Agathoxylon (Araucariaceae), Podocarpoxylon, Phyllocladoxylon, Protophyllocladoxylon (Podocarpaceae), Cupressinoxylon (Podocarpaceae/Cupressaceae). The conifer wood reveals that most common those Agathoxylon, therefore indicating a...
The fossil wood record of Leguminosae from South America. has an extensive worldwide. In America 56 records with affinity to were counted. Each is analyzed and unpublished data also included. the most palaeoxylological diverse family It temporal record, Palaeocene Pleistocene, a broad geographical span, Patagonia north Colombia.
A new megaflora composed of fossil woods and leaves is described. The bearing sediments overlie the Santa Cruz Formation (early Miocene), making it one youngest megafloras described from southern Patagonia. carbonized found as clasts within a conglomerate. It includes few specimens representing Araucariaceae (Agathoxylon sp.), Podocarpaceae (Phyllocladoxylon Cupressaceae (Cupressinoxylon sp.) two indeterminable angiosperms with anatomical features consistent Nothofagaceae. Most are assigned...
ABSTRACT An angiospermous wood from the Lower Cretaceous (upper Albian) of Cerro Barcino Formation, Chubut Group, central Patagonia, Argentina, is described. Its estimated minimum diameter 40 cm and it significant as oldest known angiosperm for South America. It has indistinct growth ring boundaries, vessels solitary in radial multiples, simple perforation plates, alternate intervessel pits, vessel-ray parenchyma pits oval to horizontally elongated, heterocellular rays, non-septate fibres,...
During the early Eocene, Patagonia had highly diverse floras that are primarily known from compression and pollen fossils. Fossil wood studies this epoch scarce in region largely absent Laguna del Hunco flora, which has a excellently preserved assemblage. A collection of 26 conifer woods fossil-lake beds (early ca. 52 Ma) central-western was studied, 12 could be identified to genus. The dominant species is Phyllocladoxylon antarcticum , affinity with early-diverging Podocarpaceae such as...
The scarce fossil wood record of Proteaceae is complemented with the addition a new morphogenus two species from Oligocene Patagonia, Scalarixylon patagonicum, gen. nov., sp. and S. grandiradiatum, nov. They become first that have all typical characteristics anatomy: wide multiseriate rays, tangential bands vessels unilateral banded associated parenchyma simple perforation plates. seem to be related extant inhabit subantarctic forests Patagonia.
Fossil woods with Araucariaceae affinity from the Bajo Barreal Formation, Late Cretaceous of central Patagonia (Argentina). collected sediments Formation (Patagonia, Argentina) are described and assigned to morphogenus Agathoxylon. The have weakly marked growth ring boundaries, uniseriate rarely biseriate radial pitting, contiguous circular hexagonal bordered pits, alternate when biseriate. Rays low, usually up 5 cells in height. Cross-field pits not very well preserved; they seem be...