MACNBR   00242
MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
artículos
Título:
Aptian ferns with in situ spores from the South Shetland Islands, Antarctica
Autor/es:
CÉSARI
Revista:
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2006 vol. 138 p. 227 - 227
ISSN:
0034-6667
Resumen:
Compressions and impressions of fertile fern foliage occur in the Cerro Negro Formation (Early Aptian), South Shetland Islands, Antarctica. Some of them are fronds at least tripinnate, bearing rounded pinnules with sori containing annulate, stalked sporangia. The recovered spores are of the Cyathidites-type, with scattered foveae. These specimens are referred to a new genus and species: Eocyathea remesaliae gen. et sp. nov., confirming the presence of the Cyatheaceae in the area during the EarlyCretaceous. Other specimens have elongate and lobed pinnules, usually falcate, bearing one sorus per lobe. Sori with stalked, annulate sporangia bearing spores of the Cyatheacidites-type. These are referred to Sergioa austrina gen. et sp. nov., and point to diversity in the family Lophosoriaceae or related groups during the Cretaceous.