Semirostrum ceruttii Plesiosaurus belonging to the phytosaur group

belonging to the phytosaur group

and mammals

Dental microwear analyses and the sedimentary context of the Siwalik suggest that this species lived in humid savanna ecosystems

with an estimated body length of approximately 1 metre

Height 168 mm

Semirostrum ceruttii Plesiosaurus belonging to the phytosaur groupSemirostrum 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,