Plesiosauria

Cervical Vertebra of Crymocetus (formerly Plesiosaurus) Bernardi, nat. size. Fig. 1. Front view. Fig. 2. Back view of spinous process. Fig. 3. Side view. Fig. 4. Under view. From the Upper Chalk of Sussex. In the Collection of the late Fred. Dixon, Esq., F.G.S., of Worthing.

A new plesiosaur, Leurospondylus, from the Edmonton Cretaceous of Alberta

Partial skull and anterior cervical vertebrae of unidentified pliosaurid plesiosaurian (MPPL 18797) from the uppermost Callovian–middle Oxfordian of Kaberlaba (Asiago, Italy), in left lateral view. Photograph (A) and explanatory drawing (B). White, preserved bone surfaces; dark grey, preserved margins of skull fenestrae; light grey, eroded bone surface; cross hatching, broken bone.

Holotype of the polycotylid[1] plesiosaur Edgarosaurus muddi DRUCKENMILLER, 2002, (MOR 751) comprising the skull, the neck, and the left front flipper, on display in the Museum of the Rockies in Bozeman, Montana. The specimen was collected in Edgar, Carbon County, Montana, from the Shell Creek member of the Thermopolis Shale Formation, Upper Albian, uppermost Lower Cretaceous.[2]

Skeletal cross-sections and ecological estimates for four cryptoclidid plesiosaurs: Tatenectes, Cryptoclidus, Muraenosaurus, and Abyssosaurus.

Basal cryptoclidid plesiosaur restoration.

Mary Anning's plesiosaur: Plesiosaurus dolichodeirus Lower Jurassic Lyme Regis, England, UK

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.

Leptocleidus capensis, a plesiosaur from the Early Cretaceous of South Africa, pencil drawing, digital coloring

A new plesiosaur, Leurospondylus, from the Edmonton Cretaceous of Alberta

Skeletal cross-sections and ecological estimates for four cryptoclidid plesiosaurs: Tatenectes, Cryptoclidus, Muraenosaurus, and Abyssosaurus.

Arminisaurus schuberti (NAMU ES/jl 36052), a plesiosaurian from the Pliensbachian of Bielefeld (Germany). Right scapula in medial view.

Arminisaurus schuberti (NAMU ES/jl 36052), a plesiosaurian from the Pliensbachian of Bielefeld (Germany). Rear part of right lower jaw ramus in side view.

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

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

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/