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The first freshwater mosasauroid (Upper Cretaceous, Hungary) and a new clade of basal mosasauroids.

Makádi L, Caldwell MW, Ősi A - PLoS ONE (2012)

Bottom Line: Here we report on the fossilized remains of numerous individuals (small juveniles to large adults) of a new taxon, Pannoniasaurus inexpectatus gen. et sp. nov. from the Csehbánya Formation, Hungary (Santonian, Upper Cretaceous, 85.3-83.5 mya) that represent the first known mosasauroid that lived in freshwater environments.Previous to this find, only one specimen of a marine mosasauroid, cf.Plioplatecarpus sp., is known from non-marine rocks in Western Canada.

View Article: PubMed Central - PubMed

Affiliation: Department of Paleontology and Geology, Hungarian Natural History Museum, Budapest, Hungary. iharkutia@yahoo.com

ABSTRACT
Mosasauroids are conventionally conceived of as gigantic, obligatorily aquatic marine lizards (1000s of specimens from marine deposited rocks) with a cosmopolitan distribution in the Late Cretaceous (90-65 million years ago [mya]) oceans and seas of the world. Here we report on the fossilized remains of numerous individuals (small juveniles to large adults) of a new taxon, Pannoniasaurus inexpectatus gen. et sp. nov. from the Csehbánya Formation, Hungary (Santonian, Upper Cretaceous, 85.3-83.5 mya) that represent the first known mosasauroid that lived in freshwater environments. Previous to this find, only one specimen of a marine mosasauroid, cf. Plioplatecarpus sp., is known from non-marine rocks in Western Canada. Pannoniasaurus inexpectatus gen. et sp. nov. uniquely possesses a plesiomorphic pelvic anatomy, a non-mosasauroid but pontosaur-like tail osteology, possibly limbs like a terrestrial lizard, and a flattened, crocodile-like skull. Cladistic analysis reconstructs P. inexpectatus in a new clade of mosasauroids: (Pannoniasaurus (Tethysaurus (Yaguarasaurus, Russellosaurus))). P. inexpectatus is part of a mixed terrestrial and freshwater faunal assemblage that includes fishes, amphibians turtles, terrestrial lizards, crocodiles, pterosaurs, dinosaurs and birds.

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Location map of the Iharkút locality in Hungary.“X” marks the locality.
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pone-0051781-g001: Location map of the Iharkút locality in Hungary.“X” marks the locality.

Mentions: The Iharkút fossil vertebrate locality (referred to as Iharkút in memory of the village of Iharkút that was destroyed in order to create the mine) that yielded the numerous remains of Pannoniasaurus is located in an open-pit bauxite mine near Németbánya, Bakony Mountains, Western Hungary (Figure 1). The mine exposes the base of the Csehbánya Formation (Santonian, Upper Cretaceous), an alluvial floodplain deposit that contains various vertebrate remains, as well as invertebrate and plant fossils. To date, the documented vertebrate fauna includes lepisosteid and pycnodontiform fishes [13], albanerpetontid and anuran amphibians [14], bothremydid turtles [15], lizards [16], alligatoroid, ziphosuchian and heterodont eusuchian crocodiles [13], [17], azhdarchid pterosaurs [18], a rhabdodontid ornithopod [19], the ceratopsian dinosaur Ajkaceratops[20], the basal nodosaurid ankylosaur Hungarosaurus[21], [22], theropods [23], and enantiornithine birds [24].


The first freshwater mosasauroid (Upper Cretaceous, Hungary) and a new clade of basal mosasauroids.

Makádi L, Caldwell MW, Ősi A - PLoS ONE (2012)

Location map of the Iharkút locality in Hungary.“X” marks the locality.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3526648&req=5

pone-0051781-g001: Location map of the Iharkút locality in Hungary.“X” marks the locality.
Mentions: The Iharkút fossil vertebrate locality (referred to as Iharkút in memory of the village of Iharkút that was destroyed in order to create the mine) that yielded the numerous remains of Pannoniasaurus is located in an open-pit bauxite mine near Németbánya, Bakony Mountains, Western Hungary (Figure 1). The mine exposes the base of the Csehbánya Formation (Santonian, Upper Cretaceous), an alluvial floodplain deposit that contains various vertebrate remains, as well as invertebrate and plant fossils. To date, the documented vertebrate fauna includes lepisosteid and pycnodontiform fishes [13], albanerpetontid and anuran amphibians [14], bothremydid turtles [15], lizards [16], alligatoroid, ziphosuchian and heterodont eusuchian crocodiles [13], [17], azhdarchid pterosaurs [18], a rhabdodontid ornithopod [19], the ceratopsian dinosaur Ajkaceratops[20], the basal nodosaurid ankylosaur Hungarosaurus[21], [22], theropods [23], and enantiornithine birds [24].

Bottom Line: Here we report on the fossilized remains of numerous individuals (small juveniles to large adults) of a new taxon, Pannoniasaurus inexpectatus gen. et sp. nov. from the Csehbánya Formation, Hungary (Santonian, Upper Cretaceous, 85.3-83.5 mya) that represent the first known mosasauroid that lived in freshwater environments.Previous to this find, only one specimen of a marine mosasauroid, cf.Plioplatecarpus sp., is known from non-marine rocks in Western Canada.

View Article: PubMed Central - PubMed

Affiliation: Department of Paleontology and Geology, Hungarian Natural History Museum, Budapest, Hungary. iharkutia@yahoo.com

ABSTRACT
Mosasauroids are conventionally conceived of as gigantic, obligatorily aquatic marine lizards (1000s of specimens from marine deposited rocks) with a cosmopolitan distribution in the Late Cretaceous (90-65 million years ago [mya]) oceans and seas of the world. Here we report on the fossilized remains of numerous individuals (small juveniles to large adults) of a new taxon, Pannoniasaurus inexpectatus gen. et sp. nov. from the Csehbánya Formation, Hungary (Santonian, Upper Cretaceous, 85.3-83.5 mya) that represent the first known mosasauroid that lived in freshwater environments. Previous to this find, only one specimen of a marine mosasauroid, cf. Plioplatecarpus sp., is known from non-marine rocks in Western Canada. Pannoniasaurus inexpectatus gen. et sp. nov. uniquely possesses a plesiomorphic pelvic anatomy, a non-mosasauroid but pontosaur-like tail osteology, possibly limbs like a terrestrial lizard, and a flattened, crocodile-like skull. Cladistic analysis reconstructs P. inexpectatus in a new clade of mosasauroids: (Pannoniasaurus (Tethysaurus (Yaguarasaurus, Russellosaurus))). P. inexpectatus is part of a mixed terrestrial and freshwater faunal assemblage that includes fishes, amphibians turtles, terrestrial lizards, crocodiles, pterosaurs, dinosaurs and birds.

Show MeSH
Related in: MedlinePlus