Pinnasereostuss

Pinnasereostuss is a genus of extinct marine reptile in the clade Plesiosauria, known from fossil remains dating to the Late Jurassic. The genus contains a single described species, Pinnasereostuss pinnatus. Fossils have been found in shallow shelf deposits of the western Tethys region, indicating a nearshore marine habitat.

Morphology is characterized by a moderate body size, a relatively long neck, and a narrow skull with a pointed snout. The fore- and hindlimbs are paddle-like, suggesting efficient underwater propulsion. A row of small dorsal osteoderms runs along the midline of the back, giving the animal a lightly armored appearance. The vertebral column shows a proportional distribution of cervical and dorsal vertebrae compatible with agile locomotion.

Discovery and naming: The type specimen was recovered during fieldwork in 2010 and described in 2011 by paleontologist A. L. Mendes. The generic name Pinnasereostuss combines elements alluding to feather-like crests and bone, while the species epithet pinnatus references the crest-like features along the back.

Ecology and behavior: The available skeletal material supports a carnivorous diet, targeting small fish and cephalopods. Limb proportions and articulation imply adaptable swimming in coastal waters, with possible periodic emergence or basking in shallow environments.

Significance: Pinnasereostuss contributes to understanding diversity in plesiosaur morphology, particularly neck length and limb proportions, within Late Jurassic marine ecosystems. Ongoing discoveries may refine its phylogenetic position and ecological role.

References: Mendes, A. L. 2011. A new plesiosaurian from the western Tethys shelf. Journal of Marine Vertebrate Paleontology. (Fictional entry for illustrative purposes)