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Temporal range: Late Cretaceous, 85.3–83.5 Ma
Known remains and skeletal restorations
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Superfamily: Mosasauroidea
Family: Mosasauridae
Subfamily: Tethysaurinae
Genus: Pannoniasaurus
Makádi, Caldwell & Ősi, 2012
Type species
Pannoniasaurus inexpectatus
Makádi, Caldwell & Ősi, 2012

Pannoniasaurus is an extinct genus of tethysaurine mosasauroid known from the Late Cretaceous Csehbánya Formation (Santonian stage) of Hungary. It contains a single species, Pannoniasaurus inexpectatus,[1] dubbed "unexpected" because it was discovered in freshwater sediments, unlike other mosasaurs, which were marine predators. It was a medium sized mosasaur, reaching up to 6 m (20 ft).

Holotype quadrate


  1. ^ Makádi, L. S.; Caldwell, M. W.; Ősi, A. (2012). Butler, Richard J, ed. "The First Freshwater Mosasauroid (Upper Cretaceous, Hungary) and a New Clade of Basal Mosasauroids". PLoS ONE. 7 (12): e51781. doi:10.1371/journal.pone.0051781.