Abstract
Species belonging to the genera Loxoconcha, Loxocorniculum, Paracytheromorpha and Sagmatocythere have been studied in shallow marine to brackish palaeoenvironments of the Aquitaine Basin; ranging in age from the Middle Oligocene (Stampian) to the Lower Miocene (Burdigalian). Microevolutionary and regional stratigraphic information is inferred from temporal distributions of these species, the changes of their population structure, the changes of the means and standard deviations of some measured parameters and their ornamentation. All the changes recorded here seem to be specific responses to climatic and palaeogeographical modifications that took place between the Middle Oligocene and Lower Miocene. Four new species are described: Loxoconcha clinata nov. sp., L. estotiensis nov. sp., Loxocorniculum meridionalis nov. sp., Sagmatocythere escornebeouensis nov. sp.
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