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Plus que tout autre, le paléobiologiste du Paléozoïque est confronté au problème de la valeur à accorder auprincipe d'actualisme. La fiabilité des interprétations varie, en fait, avec les niveaux d'utilisation considérés. A partir d'exemples pris parmi les brachiopodes, les mollusques bivalves et les crustacés ostracodes et phyllocarides, nous illustrons différents cas d'analyses morphofonctionnelles...
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