Reference : A new Lower Cretaceous ichthyosaur from Russia reveals skull shape conservatism withi...
Scientific journals : Article
Life sciences : Zoology
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/137853
A new Lower Cretaceous ichthyosaur from Russia reveals skull shape conservatism within Ophthalmosaurinae
English
Fischer, Valentin mailto [Université de Liège - ULiège > Département de géologie > Paléontologie animale et humaine >]
Arkhangelsky, Maxim [> >]
Uspensky, Gleb [> >]
Stenshin, Ilya [> >]
Godefroit, Pascal [> >]
2014
Geological Magazine
Cambridge University Press
151
1
60-70
Yes (verified by ORBi)
International
0016-7568
New York
NY
[en] Ophthalmosaurinae ; Aptian ; Ulyanovsk ; Vision ; Ecology
[en] Ophthalmosaurinae is a recently recognized clade of derived ichthyosaurs (marine reptiles) ranging from the Bajocian (Middle Jurassic) to the late Albian (late Early Cretaceous). Whereas the Middle-Late Jurassic ophthalmosaurine Ophthalmosaurus is often regarded as a hyperspecialized deep diver, very little is known about the anatomy, evolutionary history, and ecology of Cretaceous ophthalmosaurines because of the scarcity of the fossils and the lack of well-preserved skull material. Here, we describe the skull of a new basal ophthalmosaurine ichthyosaur, Leninia stellans gen. et sp. nov., from the lower Aptian of western Russia, and compare the ocular characteristics of ophthalmosaurids. Leninia is recovered as a basal ophthalmosaurine; it possesses unique traits such as star-shaped frontal–parietal sutures as well as features previously thought to be unique to Ophthalmosaurus such as a supratemporal–stapes contact. A large sclerotic aperture – significantly bigger than in platypterygiine ophthalmosaurids and similar to that of the largest-eyed modern animals (giant and colossal squids) – and reduced dentition appear widespread within ophthalmosaurines. This conservatism suggests ophthalmosaurine ophthalmosaurids occupied similar ecological niche(s) throughout their long evolutionary history.
F.R.S.-FNRS - Fonds de la Recherche Scientifique
Researchers ; Professionals ; Students ; General public
http://hdl.handle.net/2268/137853
10.1017/S0016756812000994

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