Reference : A basal thunnosaurian from Iraq reveals disparate phylogenetic origins for Cretaceous...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/148503
A basal thunnosaurian from Iraq reveals disparate phylogenetic origins for Cretaceous ichthyosaurs
English
Fischer, Valentin mailto [Université de Liège - ULiège > Département de géologie > Paléontologie animale et humaine >]
Appleby, Robert [> >]
Naish, Darren [> >]
Liston, Jeff [> >]
Riding, James [> >]
Brindley, Stephen [> >]
Godefroit, Pascal [> >]
15-May-2013
Biology Letters
9
20130021
1-6
Yes (verified by ORBi)
International
1744-9561
1744-957X
[en] Parvipelvia ; Baracromia ; Malawania anachronus ; Early Cretaceous
[en] Cretaceous ichthyosaurs have typically been considered a small, homogeneous assemblage sharing a common Late Jurassic ancestor. Their low diversity and disparity have been interpreted as indicative of a decline leading to their Cenomanian extinction. We describe the first post-Triassic ichthyosaur from the Middle East, Malawania anachronus gen. et sp. nov. from the Early Cretaceous of Iraq, and re-evaluate the evolutionary history of parvipelvian ichthyosaurs via phylogenetic and cladogenesis rate analyses. Malawania represents a basal grade in thunnosaurian evolution that arose during a major Late Triassic radiation event and was previously thought to have gone extinct during the Early Jurassic. Its pectoral morphology appears surprisingly archaic, retaining a forefin architecture similar to that of its Early Jurassic relatives. After the initial latest Triassic radiation of early thunnosaurians, two subsequent large radiations produced lineages with Cretaceous representatives, but the radiation events themselves are pre-Cretaceous. Cretaceous ichthyosaurs therefore include distantly related lineages, with contrasting evolutionary histories, and appear more diverse and disparate than previously supposed.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals ; Students ; General public
http://hdl.handle.net/2268/148503
10.1098/rsbl.2013.0021
http://reflexions.ulg.ac.be/en/IchtyosaurMalawania

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