Semirostrum ceruttii Plesiosaurus with an estimated body length

with an estimated body length of approximately 1 metre

as its anatomy suggests that it was an agile flier and specialized in capturing prey in flight

and mammals

The vertebral column was composed of numerous cervical

esta cola habría contribuido significativamente al equilibrio y estabilidad del animal durante el desplazamiento

Semirostrum ceruttii Plesiosaurus with an estimated body lengthSemirostrum ceruttii was a fossil odontocete belonging to Phocoenidae, the porpoise family, known from marine Pliocene deposits in California, United States. Formally described by Racicot and colleagues in 2014, this taxon represents one of the most extraordinary forms in porpoise evolution because of its extremely elongated lower jaw, which projected far beyond the upper rostrum. Its generic name may be interpreted as half rostrum or half beak,