Glaussaceras

Glaussaceras is a genus of extinct marine reptiles belonging to the plesiosaur order. These long-necked marine predators inhabited the oceans during the Late Cretaceous period, approximately 90 to 70 million years ago. Fossils attributed to Glaussaceras have primarily been discovered in marine sedimentary rocks.

The genus is characterized by its generally medium-sized body plan compared to other plesiosaurs. Key anatomical features that distinguish Glaussaceras include specific proportions of its cervical vertebrae, which contributed to its neck length and flexibility, and the structure of its skull and teeth, adapted for capturing fish and other small marine life. Evidence suggests they were active swimmers, using their paddle-like limbs for propulsion.

The exact phylogenetic relationships of Glaussaceras within the plesiosaur group are still subject to ongoing research and debate among paleontologists. Its evolutionary lineage and specific ecological role within Cretaceous marine ecosystems are areas of continued scientific inquiry. The limited fossil record presents challenges in fully understanding its morphology and behavior.