Reference : Peculiar macrophagous adaptations in a new Cretaceous pliosaurid
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Life sciences : Zoology
Peculiar macrophagous adaptations in a new Cretaceous pliosaurid
Fischer, Valentin mailto [Université de Liège > Département de géologie > Paléontologie animale >]
Arkhangelsky, Maxim [> >]
Stenshin, Ilya [> >]
Uspensky, Gleb [> >]
Zverkov, Nikolay [> >]
Benson, Roger [> >]
Royal Society Open Science
Royal Society Publishing
United Kingdom
[en] Plesiosauria ; Pliosauridae ; Cretaceous ; macrophagy ; convergence ; Makhaira rossica
[en] During the Middle and Late Jurassic, pliosaurid plesiosaurs evolved gigantic body size and a series of craniodental adaptations that have been linked to the occupation of an apex predator niche. Cretaceous pliosaurids (i.e. Brachaucheninae) depart from this morphology, being slightly smaller and lacking the macrophagous adaptations seen in earlier forms. However, the fossil record of Early Cretaceous pliosaurids is poor, concealing the evolution and ecological diversity of the group. Here, we report a new pliosaurid from the Late Hauterivian (Early Cretaceous) of Russia. Phylogenetic analyses using reduced consensus methods recover it as the basalmost brachauchenine. This pliosaurid is smaller than other derived pliosaurids, has tooth alveoli clustered in pairs and possesses trihedral teeth with complex serrated carinae. Maximum-likelihood ancestral state reconstruction suggests early brachauchenines retained trihedral teeth from their ancestors, butmodified this feature in a uniqueway, convergent with macrophagous archosaurs or sphenacodontoids. Our findings indicate that Early Cretaceous marine reptile teeth with serrated carinae cannot be unequivocally assigned to metriorhynchoid crocodylomorphs. Furthermore, they extend the known diversity of dental adaptations seen in Sauropterygia, the longest lived clade of marine tetrapods.
F.R.S.-FNRS - Fonds de la Recherche Scientifique ; Newton Internal Fellowship (Royal Society, UK) ; Vocatio Foundation
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