Portunatasaurus ("Dugi Otok lizard") is a genus of mosasauroid squamate that lived during the Late Cretaceous period in what is now Croatia.

It contains a single species, P. krambergeri, recovered from the Adriatic-Dinaric Carbonate Platform.

[1] It was a relatively small reptile, reaching 1 m (3.3 ft) in length.

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