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An Early Cretaceous ichthyosaur from SE France: implications on the evolution of post-Liassic Ichthyosauria
Fischer, Valentin; Clément, Arnaud; Guiomar, Myette et al.
20108th meeting of the European Association of Vertebrate Palaeontologists
 

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Keywords :
Ichthyosauria; Aegirosaurus; Valanginian; Southeastern France; Feeding guilds; Jurassic-Cretaceous boundary extinction
Abstract :
[en] A complete ichthyosaur rostrum with 124 associated teeth was recently discovered in Laux-Montaux locality, department of Drôme, southeastern France. The associated belemnites and ammonites indicate a late Valanginian age (Neocomites peregrinus Zone, Olcostephanus nicklesi Subzone) for this fossil, which consequently represents the first diagnostic ichthyosaur ever reported from Valanginian strata. Despite its incompleteness, this specimen is perfectly consistent with Aegirosaurus leptospondylus WAGNER 1853 and is therefore referred to this rare taxon. This specimen thus greatly increases the temporal and geographic biozones of this taxon, which was previously restricted to the Tithonian (Upper Jurassic) lithographic limestones of Bavaria (southern Germany). Moreover, it indicates that Late Jurassic ichthyosaurs actually crossed the Jurassic-Cretaceous boundary with a much lighter diversity drop than previously supposed. Finally, tooth morphology and wear pattern suggest that Aegirosaurus belonged to the “Pierce II/ Generalist” feeding guild sensu Massare (1987; 1997), which was hitherto not represented in post-Liassic ichthyosaurs.
Research center :
Centre de Géosciences
Disciplines :
Earth sciences & physical geography
Author, co-author :
Fischer, Valentin  ;  Université de Liège - ULiège > Département de géologie > Paléontologie animale et humaine
Clément, Arnaud
Guiomar, Myette
Godefroit, Pascal
Language :
English
Title :
An Early Cretaceous ichthyosaur from SE France: implications on the evolution of post-Liassic Ichthyosauria
Publication date :
June 2010
Event name :
8th meeting of the European Association of Vertebrate Palaeontologists
Event organizer :
Museum d'Histoire naturelle d'Aix-en-Provence
Event place :
Aix-en-Provence, France
Event date :
7-13 june 2010
Audience :
International
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 03 July 2010

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