L’origine des Imerites Rouchadze, 1933 : résultat d’une innovation chez les Gassendiceratinae Bert,Delanoy et Bersac, 2006 (Ammonoidea,Ancyloceratina) |
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| Authors: | Didier Bert Gérard Delanoy Léon Canut |
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| Institution: | 1. Place de l’Église, 04170 La Mure-Argens, France;2. UMR CNRS 5561, « Biogéosciences », université de Bourgogne, 6, boulevard Gabriel, 21000 Dijon, France;3. Département des sciences de la terre, faculté des sciences, université de Nice-Sophia-Antipolis, 28, avenue Valrose, 06108 Nice cedex 2, France;4. 9, rue du Marché, 83630 Aups, France |
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| Abstract: | The recent discoveries of remarkably preserved specimens of Imerites dichotomum (Ammonoidea, Ancyloceratina) bring new palaeontological precisions on this genus. The study of the ontogenic development demonstrates that Imerites directly derives from genus Pseudoshasticrioceras. So, their origin is within the Gassendiceratinae and not in the Heteroceratidae like it was usually admitted. On the other hand, the coexistence of macroconch and microconch specimens in the species of the genus Imerites confirms the hypothesis of a dimorphism. The new palaeontological data prove that “Crioceras” cristatus is a nomen dubium and must be abandoned. |
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| Keywords: | Ammonoidea Ancyloceratina Hemihoplitinae Heteroceratidae Cré tacé infé rieur Barré mien Province mé diterrané enne Sud-Est de la France |
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