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      Late Maastrichtian-Danian Mytilids and Pinnids (Mollusca: Bivalvia) from Northern Patagonia, Argentina Translated title: Mytílidos y Pínnidos (Mollusca: Bivalvia) del Maastrichtiano Tardío - Daniano del Norte de Patagonia, Argentina

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          Abstract

          The Upper Cretaceous - lower Paleogene rocks from northern Patagonia yield a rich fauna of marine mollusks that may be useful in elucidating paleobiogeographic and paleoenvironmental changes taking place across the K/P boundary in the region. Most of the mollusk faunas remain poorly understood, as the preservation is generally deficient. This paper describes three new species of mytilids (Septifer mayai n. sp., Mytilaster ? edseli n. sp. and Gregariella amara n. sp.), and records four species of pinnids, one of which is new (Plesiopinna pampeana n. sp.). All the material comes from the Maastrichtian Jagüel Formation, and the Maastrichtian/Danian Roca Formation, exposed in the provinces of Río Negro, Mendoza and La Pampa (Argentina). A survey of the stratigraphic distribution of the material described shows that the only Maastrichtian species that survived into the Danian was Gregariella amara.

          Translated abstract

          Las rocas del Cretácico Superior-Paleógeno inferior expuestas en el norte de Patagonia contienen una rica fauna de moluscos cuyo estudio es importante para comprender los cambios paleobiogeográficos y paleoambientales producidos en la región durante el límite K/P. Sin embargo, una porción considerable de esta fauna permanece poco estudiada, probablemente a causa de su pobre preservación. En este trabajo se describen tres especies nuevas de mytílidos (Septifer mayai n. sp., Mytilaster ? edseli n. sp. y Gregariella amara n. sp.) y cuatro especies de pínnidos de las cuales una es nueva (Plesiopinna pampeana n. sp.). Todos los ejemplares provienen de las formaciones Jagüel (Maastrichtiano) y Roca (Maastrichtiano/Daniano) expuestas en las provincias de Río Negro, La Pampa y Mendoza, Argentina. Gregariella amara es la única especie que se registra en el Maastrichtiano y Daniano.

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          Most cited references85

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          Relation of Shell Form to Life Habits of the Bivalvia (Mollusca)

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            Paleontology of the Jurassic and Cretaceous of west central Argentina

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              Age and growth of the fan mussel Pinna nobilis from south-east Spanish Mediterranean seagrass ( Posidonia oceanica ) meadows

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                ameg
                Ameghiniana
                Ameghiniana
                Asociación Paleontológica Argentina (Buenos Aires )
                1851-8044
                March 2008
                : 45
                : 1
                : 139-152
                Affiliations
                [1 ] Universidad Nacional de La Pampa Argentina
                [2 ] Consejo Nacional de Investigaciones Científicas y Técnicas Argentina
                Article
                S0002-70142008000100009
                776daa8e-d144-4b63-a048-11ea7ab35bdf

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Argentina

                Self URI (journal page): http://www.scielo.org.ar/scielo.php?script=sci_serial&pid=0002-7014&lng=en
                Categories
                PATHOLOGY

                Pathology
                Bivalvia,Mytilids,Pinnids,Cretaceous/Paleogene boundary,Argentina,Mytílidos,Pínnidos,Límite Cretácico/Paleógeno

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