A CTEOSAURUS CRASSICOSTATUSCalligaris, 1993 was erected based on a partial skeleton of a small lizard found in marine carbonate rocks from the Cretaceous (Upper Cenomanian-Lower Turonian) of Comen, Slovenia. Here, we show that the holotype and only known specimen cannot be assigned to the genus Acteosaurus (Calligaris, 1993), but instead is referable to and indistinguishable from Adriosaurus suessiSeeley, 1881. Acteosaurus crassicostatus is therefore a junior objective synonym of Adriosaurus suessi.

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The holotype of Acteosaurus crassicostatus is in a small block of rock that is split horizontally into part and counterpart (MCSNT 9400a & b)....

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