Estudios cuticulares de Ginkgoites Seward del Cretácico Inferior de Patagonia

• Autores: Georgina Del Fueyo, Liliana Villar de Seoane, Sergio Archangelsky, Gaëtan Guignard
• Localización: Revista del Museo Argentino de Ciencias Naturales, ISSN-e 1853-0400, ISSN 1514-5158, Vol. 8, Nº. 2, 2006, págs. 143-149
• Idioma: español
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• Resumen

  • Cuticular studies of Ginkgoites Seward from the Lower Cretaceous of Patagonia. Theanatomy and ultrastructure of the leaf cuticles of Ginkgoites ticoensis Archang. and G. skottsbergii Lund. isstudied. Both taxa were collected in Santa Cruz province, G. ticoensis from the Anfiteatro de Tico Formation(Aptian) and G. skottsbergii from the Kachaike Formation (Albian). The cuticular studies were made by meansof electronic microscopy (SEM, TEM). These observations showed that G. ticoensis has hypostomatic leaves,papillae on both cuticles, and monocyclic stomata with 5-7 papillate subsidiary cells; while G. skottsbergii presentsamphistomatic leaves, and monocyclic to dicyclic stomata with 6-8 subsidiary cells partially papillate. At theultrastructural level the cuticular membrane has three layers, which are clearly distinct in both species.Comparisons with the leaf cuticle of other ginkgoalean taxa are also made.