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Polymorphism of R. suborbiculatum could be summed up as the double occurrence of individuals partially costulated and individuals completely smooth within the same population and a great inter-population variability of general size. After having put aside all altered assemblages, causes of these polymorphisms are analyzed from a palaeoenvironmental point of view and in terms of heterochronies of development. Environment seems to play a minor role in the control of these parameters. Among the several combinations between these two kinds of polymorphism, it is possible to observe a general trend to hypermorphosis during the Cenomanian-Turonian transgression. © 2003 Académie des sciences. Publié par Éditions scientifiques et médicales Elsevier SAS. Tous droits réservés.




Videt, B., & Néraudeau, D. (2003). Variabilité et hétérochronies chez l’exogyre Rhynchostreon suborbiculatum (Lamarck, 1801) (Bivalvia : Ostreoidea : Gryphaeidae) du Cénomanien et du Turonien inférieur des Charentes (SW France). Comptes Rendus - Palevol, 2(6–7), 563–576.

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