Araucaria fibrosa, a new name to replace the illegitimate name Araucaria antarctica Césari, Marenssi and Santillana, 2001 (original) (raw)
Related papers
Conifers from the Upper Cretaceous of Cape Lamb, Vega Island, Antarctica
Cretaceous Research, 2001
A fragment of an araucarian ovuliferous cone, araucarian leaves and podocarpaceous wood are described from Upper Cretaceous strata exposed at Cape Lamb, Vega Island, Antarctica. The wood fragment and the reproductive cone come from the middle part of the early Maastrichtian K2 unit whereas the leaves referred to a new species, Araucaria antarctica, were recovered from the younger (mid?) Maastrichtian K3 unit (Sandwich Bluff Member of the López de Bertodano Formation). These are the first plant megafossils to be described in detail for this locality and represent components of a Late Cretaceous forest community growing under cold-temperate conditions. The findings reported herein highlight the potential value of the fossiliferous sequence exposed on Vega Island, which has not yet been fully investigated, and provide insights into the diversity and structure of the high latitude, Late Cretaceous conifer-dominated floras.
Ameghiniana, 2013
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Polish Polar Research, 2019
Nothofagaceae fossil leaves and an associated palynoflora from Late Cretaceous sediments of Vega Island, eastern Antarctic Peninsula, are presented. The leaves are described as Nothofagus sp. 1 and Morphotype LDB 1, and come from the Snow Hill Island (late Campanian-early Maastrichtian) and the López de Bertodano (late Maastrichtian) formations, respectively. The palynoflora obtained from levels immediately above and below the Nothofagus sp. 1 and in the same horizon as the Morphotype LDB 1, included terrestrial and marine elements. In the palynoflora associated with Nothofagus sp. 1, conifers are dominant and pollen grains with Nothofagus affinity are represented by four species: Nothofagidites kaitangataensis (Te Punga) Romero 1973 and Nothofagidites senectus Dettmann and Playford 1968, which belong to the ancestral pollen type, as well as Nothofagidites dorotensis Romero 1973 and Nothofagidites sp. of the brassii-type. Cryptogamic spores, marine dinoflagellate cysts and algae, among others, are part of the assemblage. The palynoflora associated with the Morphotype LDB 1 also contains abundant conifer and angiosperm pollen grains with N. dorotensis as the only Nothofagus species recorded. Marine dinoflagellate cysts are scarce while fungi and phytodebris are common elements. The joint presence of marine and non-marine Edgardo Romero et al. 228 palynomorphs supports a probable nearshore environment at time of deposition for both units. Pollen and spore evidence suggests a mixed conifer and angiosperm forest, with Podocarpaceae and Nothofagus as the main components, and ferns, lycopods, and mosses in the understory. This forest developed under temperate and moist conditions during the middle Campanian-Maastrichtian.
MorphoBank datasets, 2020
Exceptional anatomical preservation of a fossil araucarian seed cone from a marine carbonate concretion from Vancouver Island, British Columbia, Canada provides unusually complete evidence for cone structure including seeds, megagametophytes, microgametophytes, and embryos of an Upper Cretaceous (Campanian) species of Araucaria, providing important new insights into the structure and relationships of Cretaceous Northern Hemisphere Araucariaceae. METHODS: The cone was studied from serial thin sections prepared by the coal ball peel technique. Phylogenetic analysis using a modified morphological matrix with both discrete and continuous characters was performed using TNT version 1.5. RESULTS: The nearly spherical cone, 6 × 6 cm in diameter, has helically arranged cone-scale complexes, consisting of a large bract with an upturned tip and a small, fleshy ovuliferous scale. Vascularization of the cone-scale complex is single at its origin. Widely winged bracts, with a bulging base, contain numerous vascular bundles, interspersed with transfusion tissue, and a large number of resin canals. Seeds are ovoid, 1.2 cm long, 1.2 cm in diameter. Nucellus is free from the integument, except at its base, with a convoluted apex, containing possible pollen tubes. Megagametophytes and mature cellular embryos occur in several seeds. CONCLUSIONS: This small cone with attached, imbricate leaves, wide bracts, and unusually large seeds, most closely resembles those of Araucaria Section Eutacta. Width and continuity of secondary xylem in the cone axis, and intact cone-scale complexes indicate that this cone probably did not disarticulate readily at maturity. When added to a modified, previously published phylogenetic analysis, Araucaria famii sp. nov. enhances our understanding of the Cretaceous radiation of Northern Hemisphere Araucaria Section Eutacta.
Pole Hill Harwood 2000 Eocene plant macrofossils Antarctica
… of Eocene rocks, …, 2000
Glacial erratics oi Eocene sediments at McMurdo Sound, Antarctica. contain plant macrofossils. These include Araucaria leaves, at least two species of Nothofagus based on leaves. and three types of non-Nothofagus dicotyledonous leaves. One of the Nothofagus species has plicate vernation and was therefore deciduous. Two types of Nothofagus fruits are present, two-flanged and three flanged. The three-flanged fruits indicate that they came from a four valved cupule and thus from one of the (currently) temperate subgenera.
Late Cretaceous flora of James Ross Island (Antarctica) – preliminary report
Fossil plants from Late Cretaceous strata (Hidden Lake Formation and Santa Marta Formation) of James Ross Basin exposed in the northern part of the James Ross Island are preliminary described. Both formations contain plant mega fossils, petrified wood, and charcoalified mesofossils. Fossil plants from the Hidden Lake Formation are represented by leaf impressions of pteridophytes (Microphyllopteris, Delosorus, Lygodium), conifers (Elatocladus, Brachyphyllum, Pagiophyllum, Araucaria, Podozamites vel Lindleycladus), Bennettitales vel Cycadales (Zamites vel Dioonites sp.) and angiosperms (Cinnamomoides, Dicotylophyllum ssp., Proteophyllum, Juglandiphyllum vel Dicotylophyllum). Fossil wood can be attributed to the very broadly defined morphogenus Antarctoxylon Poole & Cantrill.