Per Ove Persson

Academic paper

Norsk Polarinstitutt Årbok 1961

63-69

Two Plesiosaurian specimens from the Upper Jurassic (?Oxfordian and ?Portlandian, respectively) of Spitzbergen are described. One of them comprises the posterior parts of a skeleton, and is made the holotype of a new species, Tricleidus svalbardensis. The most prominent characters of this species are shown in the ischia, these being very broad and widely separated, and with an almost straight posterior border. The species is referred to the genus Tricleidus essentially because of the shape of the proximal bones in its hind limbs; these bones conform closely with the corresponding elements in Tricleidus seeley ANDREWS 1909. The other specimen consists of a few more or less incomplete vertebrae, an incomplete ilium, the distal end of a ? femur, and a great number of fragments of various postcranial elements. The specimen is referred to Plesiosauridae, gen. et sp. indet.

English