Pahasapasaurus

Pahasapasaurus is a genus of polycotylid plesiosaur from the late Cenomanian-aged Greenhorn Limestone of South Dakota, USA, about 94 million years ago. Distinctive features of the taxon include elongate epipodial bones (radius/ulna - tibia/fibula) and the nature of the palate bones (roof of the mouth). The type species is P. haasi.