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| Guler,M. Verónica; Guerstein,G. Raquel; Casadío,Silvio. |
| The aim of this paper is to erect four new dinoflagellate cyst species from the Maastrichtian Calafate Formation, Austral Basin, Argentina. Andalusiella spinosa sp. nov. is strongly acrocavate and possesses a periphragm covered with spines. Palaeocystodinium pilatum sp. nov. has a periphragm densely covered with fine, flexuous, hair-like projections, shortening towards the end of the horns, and a finely granulate endophragm. The large peridinialean Caligodinium perforatum sp. nov. shows the hypocystal archeopyle typical for the genus, with a simple triplacoid opercular piece and a microfoveolate autophragm surrounded by a perforate flocculent calyptra. Hafniasphaera australis sp. nov. is differentiated from other species of the genus Hafniasphaera by the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dinoflagellate cysts; Maastrichtian; Calafate Formation; Austral Basin; Argentina. |
| Ano: 2005 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142005000200012 |
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| Aguirre-Urreta,Beatriz; Suárez,Manuel; de la Cruz,Rita; Ramos,Victor A.. |
| The low diversity of the Austral Basin ammonoid faunas was traditionally associated with a high degree of endemism. However, as reported herein, the ammonoids belonging to the Family Ancyloceratidae, Subfamily Crioceratitinae have affinities with European forms. Therefore, the Hauterivian ammonoids of the Austral Basin represent a mixture of endemic (Favrella Douvillé), with typical Tethyan examples (Hemihoplites Spath, Crioceratites Léveillé), and faunas that are characteristic of Northwestern Europe on the margins of the Boreal realm (Protaconeceras Casey, Aegocrioceras Spath), although the endemic forms dominate in number of specimens. The following species are described here: Aegocrioceras patagonicum sp. nov. Aguirre-Urreta, Crioceratites (C.) apricum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ammonoids; Crioceratitinae; Hauterivian; Austral Basin; Chile. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000200010 |
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