The Hvar fossil lizard, though it does not belong to the Gorjanović collection and his newly described species, is an exceptionally rare and unique discovery, and deserves special attention. It was the subject of the graduate thesis of Dražen Japundžić, who identified it as Pontosaurus sp. (since in its morphological traits it was most similar to Kornhuber’s species Pontosaurus (Hydrosaurus) dalmatinus), and work on this interesting find continues to this day. This lizard belongs to the family Dolichosauridae, a semi-aquatic reptile that was considered to be nearly incapable of walking on land, and instead adapted for life in the sea. Like the aigilosaurids, in the evolutionary sense it was positioned somewhere between snakes and the mosasaur, which was fully adapted for life in the sea. However, semi-aquatic means that this lizard was equally well adapted for life in the sea and outside it.

At the locality Brbišćica on the island of Dugi Otok, the predominant forms are the reef (rudist) and well-layered (platy and laminate) limestones of Upper Cretaceous age (Cenomanian/Turonian).

The fossil lizard from Brbišćica Bay on Dugi Otok was discovered in 2008 by Donat Petricioli, biologist and marine researcher from Zadar. During field research and laboratory analyses, including the curators of the Geology and Palaeontology Section of the museum, together with scientists from the University of Alberta in Canada, it was determined that this specimen belongs to a completely new genus and species of plesiopedal mosasauroid (marine lizard from the Late Cretaceous, with limbs adapted for movement on land). In honour of Dragutin Gorjanović-Kramberger, this species was named Portunatosaurus krambergeri.