Moderately sized plesiosauroid, adults up to 3.5 m in length with a skull-length of approximately 170 mm, temporal openings have approximately the same size as the orbits; five premaxillary teeth, a maximum of 20 maxillary teeth, smaller teeth directly around the premaxillarymaxillary suture and four to five enlarged teeth in both premaxilla and maxilla near the premaxillarymaxillary suture, teeth with fine striae on the lingual side and distinctly less pronounced or absent striae on the buccal side; maxilla with a long posteroventral process reaching approximately to the middle of the jugal, small parietal foramen situated at the frontal-parietal suture, parasphenoid of oblong form without cultriform process and anterior interpterygoid vacuity with rounded posterior margin, straight pterygoid-ectopterygoid suture; four proximal carpals and tarsals, maximum number of phalanges more than ten in the third digit, limbs long, approximately 25 per cent of the overall body length in adults

in honor of King and Emperor Willhelm II of Germany