Elasmosaurus

Reconstruction of three Elasmosaurus hunting Hesperornis. From Osborn, H. F. (1917). The origin and evolution of life, on the theory of action, reaction and interaction of energy.

Illustration of an Elasmosaurus platyurus devouring a juvenile Tylosaurus while a Hesperornis swims by in the background, based on recent research on Elasmosaurid paleobiology which shows that they were far more raptorial than previously thought: https://sobekswimmingpool.wordpress.com/2021/05/30/what-sea-dragons-ate-plesiosaur-diets-revised/

Elasmosaurus platyurus, plesiosaurian from Late Cretaceous (Campanian) of North America

Elasmosaurus platyurus, plesiosaurian from Late Cretaceous (Campanian) of North America

crop of file in file name

Elasmosaurus platyurus swimming with straight necks

Elasmosaurus, Pencil drawing Author:User:ArthurWeasley

Prehistoric marine reptile.

Extinct monsters London :Chapman & Hall,1896. biodiversitylibrary.org/page/14893531 Extinct Monsters London :Chapman & Hall,1896. www.biodiversitylibrary.org/item/51560

Dorsal vertebrae of Elasmosaurus.

Elasmosaurus platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado

Elasmosaurus platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado

Elasmosaurus platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado

Elasmosaurus platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado

Elasmosaurus platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado

Elasmosaurus platyurus in the Rocky Mountain Dinosaur Resource Center in Woodland Park, Colorado