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A new araucarian fossil species from the Paleogene of southern Argentina Ameghiniana
Panti,Carolina; Césari,Silvia N.; Marenssi,Sergio A.; Olivero,Eduardo B..
A new Araucariaceaea from the Paleogene of Tierra del Fuego Province, Argentina is described. Araucaria pararaucana sp. nov. has imbricate, ovate-lanceolate leaves with an acute apex, characterized by the presence of discontinuous and longitudinally oriented stomatal rows separated by epidermal cells, which may be slightly sinuous. Stomatal guard cell surface is granular. These fossil leaves are compared with the extant sections Bunya, Intermedia and Araucaria. Their anatomical characters along with the external morphology suggest a close affinity with the extant southern Patagonian species A. araucana (Molina) K. Koch. The record of this new late Eocene species provides more evidence for a probable unique representation of Section Araucaria in the area...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gymnosperms; Araucariaceae; Araucaria; Cuticle; Paleogene; Argentina.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100016
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Fossil woods (Coniferales) from the Baqueró Group (Aptian), Santa Cruz Province, Argentina Anais da ABC (AABC)
Vera,Ezequiel I.; Césari,Silvia N..
Two new conifer morphospecies represented by a secondary xylem are reported for the Lower Cretaceous Baqueró Group (Santa Cruz Province, Argentina). Agathoxylon sp. is characterized by poorly defined growth rings, predominantly uniseriate pitting in the radial wall of the tracheids, cross fields with 1-6 pits and uniseriate rays. These features are shared with the leafy branches described for the unit as Araucaria grandifolia Feruglio emend. Del Fueyo and Archangelsky. The second taxon, Brachyoxylon sp. cf. B. boureaui, possesses poorly defined growth rings, mixed wood with predominantly uniseriate radial pitting, cross fields with 8-26 pits and uniseriate rays. These taxa represent the first fossil woods described for Baqueroan strata.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fossil woods; Agathoxylon; Brachyoxylon; Lower Cretaceous; Patagonia; Baqueró Group.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300005
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