Diagnosis—Small to moderate polycotylid plesiosaurs with distinctly polygonal (i.e., nearly equi-dimensional) radius and ulna in the forelimb, and tibia and fibula in the rear limb, in contrast to all other known polycotylids in which the previously noted elements are relatively short and broad.

Palmula, Latin for “blade of an oar” in reference to plesiosaur paddles;