Article (Scientific journals)
Ichthyosaurs from the French Rhaetian indicate a severe turnover across the Triassic–Jurassic boundary
Fischer, Valentin; Cappetta, Henri; Vincent, Peggy et al.
2014In Naturwissenschaften (Die), 101, p. 1027–1040
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Keywords :
Ichthyosauria; Shastasauridae; Paléontologie; Rhaetian; Latest Triassic extinction; turnover
Abstract :
[en] 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
Disciplines :
Earth sciences & physical geography
Zoology
Author, co-author :
Fischer, Valentin  ;  Université de Liège - ULiège > Département de géologie > Paléontologie animale et humaine
Cappetta, Henri
Vincent, Peggy
Garcia, Géraldine
Goolaerts, Stijn
Martin, Jérémy E.
Roggero, Daniel
Valentin, Xavier
Language :
English
Title :
Ichthyosaurs from the French Rhaetian indicate a severe turnover across the Triassic–Jurassic boundary
Publication date :
2014
Journal title :
Naturwissenschaften (Die)
ISSN :
0028-1042
eISSN :
1432-1904
Publisher :
Springer Verlag, Berlin, Germany
Volume :
101
Pages :
1027–1040
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 27 September 2014

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