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- W1834330475 abstract "Abstract. 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 Douville), with typical Tethyan examples (Hemihoplites Spath, Crioceratites Leveille), 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: Aegocrioceraspatagonicum sp. nov. Aguirre-Urreta, Crioceratites (C.) apricum (Giovine) and Crioceratites sp. aff. C. (C.) schlagintweiti (Giovine). This rare and localized appearance of taxa of the Northern Hemisphere suggests periods of sea level rise that permitted widespread migration from this region to peripheral basins.Resumen. AMONOIDEOS (CRIOCERATITINAE, HAUTERIVIANO) DELACUENCA AUSTRAL, CHILE.La baja diversidad de las faunas de amonoideos de la cuenca Austral ha sido tradicionalmente asociada a su alto grado de endemismo. Sin embargo, aqui se describe una fauna de amonoideos de la Familia Ancyloceratidae, Subfamilia Crioceratitinae que muestra afinidades con formas europeas. De este modo, los amonoideos hauterivianos de la cuenca Austral representan una mezcla de generos endemicos (Favrella Douville), con tipicos ejemplos tethyanos (Hemihoplites Spath, Crioceratites Leveille) y faunas caracteristicas del noroeste de Europa en los margenes del reino Boreal (Protaconoceras Casey, Aegocrioceras Spath), aunque las formas endemicas dominan en numero de ejemplares. Se describen las siguientes especies: Aegocrioceraspatagonicum sp. nov. Aguirre-Urreta, Crioceratites (C.) apricum (Giovine) y Crioceratites sp. aff. C. (C.) schlagintweiti (Giovine). Esta rara y localizada aparicion de taxones del Hemisferio Norte sugiere periodos de nivel del mar global alto, lo que habria permitido la migracion desde esta region a cuencas perifericas." @default.
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- W1834330475 date "2007-06-30" @default.
- W1834330475 modified "2023-09-30" @default.
- W1834330475 title "Ammonoids (Crioceratitinae, Hauterivian) from the Austral Basin, Chile" @default.
- W1834330475 hasPublicationYear "2007" @default.
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