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Ichthyosaurs from the French Rhaetian indicate a severe turnover across the Triassic-Jurassic boundary
Fischer, V.; Cappetta, H.; Vincent, P.; Garcia, G.; Goolaerts, S.; Martin, J.; Roggero, D.; Valentin, X. (2014). Ichthyosaurs from the French Rhaetian indicate a severe turnover across the Triassic-Jurassic boundary. Naturwissenschaften 101(12): 1027-1040. dx.doi.org/10.1007/s00114-014-1242-7
In: Naturwissenschaften. Springer: Heidelberg; Berlin. ISSN 0028-1042, more
Peer reviewed article  

Available in Authors 

Keyword
    Marine
Author keywords
    Ichthyosauria; Shastasauridae; Rhaetian; Latest Triassic extinction;Turnover

Authors  Top 
  • Fischer, V., more
  • Cappetta, H.
  • Vincent, P.
  • Garcia, G.
  • Goolaerts, S., more
  • Martin, J.
  • Roggero, D.
  • Valentin, X.

Abstract
    Mesozoic marine reptiles went through a severe turnover near the end of the Triassic. Notably, an important extinction event affected ichthyosaurs, sweeping a large part of the group. This crisis is, however, obscured by an extremely poor fossil record and is regarded as protracted over the entire Norian–earliest Jurassic interval, for the lack of a more precise scenario. The iconic whale-sized shastasaurid ichthyosaurs are regarded as early victims of this turnover, disappearing by the middle Norian. Here we evaluate the pattern of this turnover among ichthyosaurs by analysing the faunal record of two Rhaetian localities. One locality is Autun, eastern France; we rediscovered in this material the holotypes or partial ‘type’ series of Rachitrema pellati, Actiosaurus gaudryi, Ichthyosaurus rheticus, Ichthyosaurus carinatus and Plesiosaurus bibractensis; a revised taxonomic scheme is proposed. The second assemblage comes from a new locality: Cuers, southeastern France. Both these assemblages provide several lines of evidence for the presence of shastasaurid-like ichthyosaurs in the Rhaetian of Europe. These occurrences suggest that both the demise of shastasaurids and the sudden radiation of neoichthyosaurians occurred within a short time window; this turnover appears not only more abrupt but also more complex than previously postulated and adds a new facet of the end-Triassic mass extinction.

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