Plesiosauria

Plesiosaurus of the Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"

Muraenosaurus? Reedii, Sp. Nov. and Tricleidus? Laramiensis Knight, American Jurassic Plesiosaurs

Muraenosaurus? Reedii, Sp. Nov. and Tricleidus? Laramiensis Knight, American Jurassic Plesiosaurs

Muraenosaurus? Reedii, Sp. Nov. and Tricleidus? Laramiensis Knight, American Jurassic Plesiosaurs

Muraenosaurus? Reedii, Sp. Nov. and Tricleidus? Laramiensis Knight, American Jurassic Plesiosaurs

Muraenosaurus? Reedii, Sp. Nov. and Tricleidus? Laramiensis Knight, American Jurassic Plesiosaurs

Vertebrae and ribs of the British Jurassic pliosaurid plesiosaur Eardasaurus housed at the Oxford University Natural History Museum.

Caudal vertebrae and chevrons of the British Jurassic pliosaurid plesiosaur Eardasaurus housed at the Oxford University Natural History Museum.

Paddle of the British Jurassic pliosaurid plesiosaur Eardasaurus housed at the Oxford University Natural History Museum.

Attenborosaurus conybeari, a plesiosaur from the Early Jurassic of England, pencil drawing

Attenborosaurus conybeari, a plesiosaur from the Early Jurassic of England, pencil drawing

Attenborosaurus conybeari, a plesiosaur from the Early Jurassic of England, pencil drawing

Neck (top) and lower back (bottom) vertebrae of plesiosaur Scanisaurus sp., excavated in the Kristianstad Basin and exhibited at the "Havsdrakarnas hus" exhibition in Bromölla, Sweden. Background digitally replaced with black color.

Neck (top) and lower back (bottom) vertebrae of plesiosaur Scanisaurus sp., excavated in the Kristianstad Basin and exhibited at the "Havsdrakarnas hus" exhibition in Bromölla, Sweden. Background digitally replaced with black color.

"Eric", a near-complete opalized specimen of the plesiosaur Umoonasaurus at the Australian Museum

Symphysis of the mandible of Plesiosaurus indicus from Kachchh, Gujarat, with a total estimated length of 3.55 inches.