Historia evolutiva de las angiospermas (Cretácico-Paleógeno) en Argentina a través de los registros fósiles

PRÁMPARO, M.; QUATTROCCHIO, M.; GANDOLFO, M.; ROMERO, E. J; ZAMALOA, M. C

AMEGHINIANA

Asociacion Paleontológica Argentina

Lugar: Buenos Aires; Año: 2007 vol. 11 p. 157 - 172

0002-7014

Abstract. ANGIOSPERM EVOLUTIONARY HISTORY (CRETACEOUS-PALEOGENE) IN ARGENTINA BASED ONANGIOSPERM EVOLUTIONARY HISTORY (CRETACEOUS-PALEOGENE) IN ARGENTINA BASED ON PALEOFLORISTIC RECORDS. A summary on the evolution of angiosperms in Argentina, based on the record of fossil pollen and leaf types is herein discussed. The palynological and paleobotanical occurrences from different Cretaceous to Paleogene geological formations based on published data are analyzed. Pollen of primitive angiosperms is subordinate in number to both, gymnosperms and pteridophytes until the Campanian. During the Maastrichtian they are abundant and show a great diversification of the wall structure and aperture types. During the Paleogene they reached, as in present days, an ecological prominence. Angiosperm fossil leaves display a general similar evolutionary trend as shown by the pollen, with an increase in the number of taxa towards the end of the Cretaceous and a more complex morphology during the Paleogene. It is concluded that the knowledge of the evolution of angiosperms in Argentina is still scarce and that further detailed studies on different aspects are needed in order to achieve a better understanding of their role in southern latitudes.ALEOFLORISTIC RECORDS. A summary on the evolution of angiosperms in Argentina, based on the record of fossil pollen and leaf types is herein discussed. The palynological and paleobotanical occurrences from different Cretaceous to Paleogene geological formations based on published data are analyzed. Pollen of primitive angiosperms is subordinate in number to both, gymnosperms and pteridophytes until the Campanian. During the Maastrichtian they are abundant and show a great diversification of the wall structure and aperture types. During the Paleogene they reached, as in present days, an ecological prominence. Angiosperm fossil leaves display a general similar evolutionary trend as shown by the pollen, with an increase in the number of taxa towards the end of the Cretaceous and a more complex morphology during the Paleogene. It is concluded that the knowledge of the evolution of angiosperms in Argentina is still scarce and that further detailed studies on different aspects are needed in order to achieve a better understanding of their role in southern latitudes.