Elasmosauridae
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Elasmosauridae, often called elasmosaurs or elasmosaurids, is an extinct family of plesiosaurs that lived from the Hauterivian stage of the Early Cretaceous to the Maastrichtian stage of the Late Cret
Restoration showing two Elasmosaurus swimming with straight necks
Outdated restoration of Elasmosaurus showing its neck raised above water, by Samuel Wendell Williston, 1914
Gastroliths and bones (right) of an undetermined plesiosaur from Kansas
Placochelys BW
Plesiosaur
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The Plesiosauria or plesiosaurs are an order or clade of extinct Mesozoic marine reptiles, belonging to the Sauropterygia. Plesiosaurs first appeared in the latest Triassic Period, possibly in the Rha
Elasmosauridae
…Elasmosauridae, often called elasmosaurs or elasmosaurids, is an extinct family of plesiosaurs that lived from the Hauterivian stage of the Early Cretaceous to the Maastrichtian stage of the Late Cretaceous period (c. 130 to 66 mya). The taxon…
Paleo Hall at HMNS plesiosaur
Peloneustes philarchus Tubingen
First published plesiosaur skeleton, 1719 (specimen NHMUK PV R.1330)
As this illustration shows, Conybeare by 1824 had gained a basically correct understanding of plesiosaur anatomy.