Paléopathologie des ammonites — Historique et exemples pris dans le Toarcien et l'Aalénien (Jurassique) de la Région lyonnaise (France)

Rulleau, Louis (2015) Paléopathologie des ammonites — Historique et exemples pris dans le Toarcien et l'Aalénien (Jurassique) de la Région lyonnaise (France). Hantkeniana, 10. pp. 59-71. ISSN 1219-3933

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Abstract

Palaeopathology of the Ammonites. Historic review and new data from the Jurassic (Toarcian, Aalenian) of the mLyon's area. From the beginning of the XIXth century, paleontologists noticed that certain ammonites show surprising morphological characteristics. Therefore, they often interpreted these ammonites as new species, before these anomalies were correctly attributed to wounds or diseases of already known species. So, the genus Monestieria, may not be used mnow. mThe rich Jurassic deposits of the region of Lyon delivered numerous examples of abnormal ammonites in Toarcian and Aalenian levels. The genera Hammatoceras seems particularly affected. These ammonites, in very good state of mpreservation, supply good examples of the main anomalies we can observe on these mollusks. However, the causes of these anomalies are still relatively badly defined: they are still not studied in particular on the current molluscs.

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