Article (Scientific journals)
New Ophthalmosaurid Ichthyosaurs from the European Lower Cretaceous Demonstrate Extensive Ichthyosaur Survival across the Jurassic–Cretaceous Boundary
Fischer, Valentin; Maisch, Michael; Naish, Darren et al.
2012In PLoS ONE, 7 (1), p. 29234
Peer Reviewed verified by ORBi
 

Files


Full Text
Fischer et al 2012 New Ophthalmosaurid Ichthyosaurs from the European Lower Cretaceous Demonstrate Extensive Ichthyosaur Survival across the Jurassic–Cretaceous Boundary.pdf
Publisher postprint (4.71 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Ophthalmosauridae; Ichthyosauria; Ophthalmosaurinae; Platypterygiinae; Acamptonectes densus; Jurassic–Cretaceous boundary; Extinction; Survival rate; Hauterivian; Cretaceous; Greensand formation
Abstract :
[en] Background Ichthyosauria is a diverse clade of marine amniotes that spanned most of the Mesozoic. Until recently, most authors interpreted the fossil record as showing that three major extinction events affected this group during its history: one during the latest Triassic, one at the Jurassic–Cretaceous boundary (JCB), and one (resulting in total extinction) at the Cenomanian-Turonian boundary. The JCB was believed to eradicate most of the peculiar morphotypes found in the Late Jurassic, in favor of apparently less specialized forms in the Cretaceous. However, the record of ichthyosaurs from the Berriasian–Barremian interval is extremely limited, and the effects of the end-Jurassic extinction event on ichthyosaurs remains poorly understood. Methodology/Principal Findings Based on new material from the Hauterivian of England and Germany and on abundant material from the Cambridge Greensand Formation, we name a new ophthalmosaurid, Acamptonectes densus gen. et sp. nov. This taxon shares numerous features with Ophthalmosaurus, a genus now restricted to the Callovian–Berriasian interval. Our phylogenetic analysis indicates that Ophthalmosauridae diverged early in its history into two markedly distinct clades, Ophthalmosaurinae and Platypterygiinae, both of which cross the JCB and persist to the late Albian at least. To evaluate the effect of the JCB extinction event on ichthyosaurs, we calculated cladogenesis, extinction, and survival rates for each stage of the Oxfordian–Barremian interval, under different scenarios. The extinction rate during the JCB never surpasses the background extinction rate for the Oxfordian–Barremian interval and the JCB records one of the highest survival rates of the interval. Conclusions/Significance There is currently no evidence that ichthyosaurs were affected by the JCB extinction event, in contrast to many other marine groups. Ophthalmosaurid ichthyosaurs remained diverse from their rapid radiation in the Middle Jurassic to their total extinction at the beginning of the Late Cretaceous.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Fischer, Valentin  ;  Université de Liège - ULiège > Département de géologie > Paléontologie animale et humaine
Maisch, Michael
Naish, Darren
Kosma, Ralf
Liston, Jeff
Joger, Ulrich
Krüger, Fritz
Pardo Pérez, Judith
Tainsh, Jessica
Appleby, Robert
Language :
English
Title :
New Ophthalmosaurid Ichthyosaurs from the European Lower Cretaceous Demonstrate Extensive Ichthyosaur Survival across the Jurassic–Cretaceous Boundary
Publication date :
03 January 2012
Journal title :
PLoS ONE
eISSN :
1932-6203
Publisher :
Public Library of Science, San Franscisco, United States - California
Volume :
7
Issue :
1
Pages :
e29234
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Commentary :
Covered in Reflexions: http://reflexions.ulg.ac.be/ichtyosaure
Available on ORBi :
since 03 January 2012

Statistics


Number of views
188 (12 by ULiège)
Number of downloads
263 (3 by ULiège)

Scopus citations®
 
104
Scopus citations®
without self-citations
83
OpenCitations
 
78

Bibliography


Similar publications



Contact ORBi