1. The gaudryceratid ammonoids from the Upper Cretaceous of the James Ross Basin, Antarctica
- Author
-
Eduardo B. Olivero, María Eugenia Raffi, and Florencia Nidia Milanese
- Subjects
010506 paleontology ,Gaudryceratinae ,GAUDRYCERATINAE ,Structural basin ,010502 geochemistry & geophysics ,01 natural sciences ,Paleontología ,Cretaceous ,Ciencias de la Tierra y relacionadas con el Medio Ambiente ,Phylloceratida ,purl.org/becyt/ford/1 [https] ,purl.org/becyt/ford/1.5 [https] ,lcsh:GN282-286.7 ,Ammonoidea ,lcsh:Fossil man. Human paleontology ,AMMONOIDEA ,Lytoceratoidea ,lcsh:QE701-760 ,0105 earth and related environmental sciences ,biology ,Paleontology ,PHYLLOCERATIDA ,biology.organism_classification ,Archaeology ,LYTOCERATOIDEA ,lcsh:Paleontology ,Antarctica ,Geology ,CIENCIAS NATURALES Y EXACTAS - Abstract
We describe new material of the Subfamily Gaudryceratinae in Antarctica, including five new species: Gaudryceras submurdochi Raffi and Olivero sp. nov., Anagaudryceras calabozoi Raffi and Olivero sp. nov., Anagaudryceras subcompressum Raffi and Olivero sp. nov., Anagaudryceras sanctuarium Raffi and Olivero sp. nov. and Zelandites pujatoi Raffi and Olivero sp. nov., recorded in Santonian to Maastrichtian deposits of the James Ross Basin. The early-mid Campanian Anagaudryceras calabozoi sp. nov. exhibits a clear dimorphism, expressed by marked differences in the ornament of the adult body chamber. Contrary to the scarcity of representative members of the subfamily Gaudryceratinae in the Upper Cretaceous of other localities in the Southern Hemisphere, the Antarctic record reveals high abundance and diversity of 15 species and three genera in total. This highly diversified record of gaudryceratins is only comparable with the Santonian-Maastrichtian Gaudryceratinae of Japan and Sakhalin, which yields a large number of species of Anagaudryceras, Gaudryceras, and Zelandites. The reasons for a similar, highly diversified record of the Gaudryceratinae in these distant and geographically nearly antipodal regions are not clear, but we argue that they probably reflect a similar paleoecological control. Fil: Raffi, María Eugenia. Universidad Nacional de Tierra del Fuego; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Olivero, Eduardo Bernardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego; Argentina Fil: Milanese, Florencia Nidia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ciencias Geológicas; Argentina
- Published
- 2019