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Hungarosaurus and Struthiosaurus (Ankylosauria) were sympatric
From: Ben Creisler
A new online paper:
Attila Ősi & Edina Prondvai (2013)
Sympatry of two ankylosaurs (Hungarosaurus and cf. Struthiosaurus) in
the Santonian of Hungary.
Cretaceous Research (advance online publication)
A complete and well-preserved right ankylosaurian humerus from the
Upper Cretaceous (Santonian) Csehbánya Formation of Iharkút, western
Hungary is described here. Based on its osteological features and 21.5
cm adult length, the new specimen is markedly different from the
slender humerus of Hungarosaurus, the previously known ankylosaur from
the locality, and more similar to that of Struthiosaurus. Thus, the
new Hungarian specimen is tentatively assigned here to cf.
Struthiosaurus thereby dating back the first occurrence of this genus
to the Santonian. The new fossil demonstrates the sympatric
co-existence of two different nodosaurid ankylosaurs (a smaller,
robust form with 2–2.5 m total body length and a larger, cursorial
form with 4–4.5 m body length) in the Iharkút fauna. This also
suggests that the pattern of the European ankylosaur diversity was
more complex than previously thought.