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One of an extinct order of reptiles, including Mosasaurus and allied genera. See Mosasauria.

ey are, essentially, fossil sea serpents with paddles. Called also Pythonomarpha, and Mosasauria.

was discovered in Cretaceous beds near Maestricht, in the Netherlands. [Written also Mososaurus.]

Same as Mosasaurus.

An order of extinct flying reptiles; -- called also Pterosauria.

A genus of fossil saurians found in the Permian formation.

A suborder of Theromorpha, including terrestrial reptiles from the Permian formation.

Same as Pliosaurus.

One of the Plesiosauria.

An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia.

A plesiosaur.

A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.

An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck.

An extinct genus of reptiles of the Permian period. Called also Protosaurus.

A pterodactyl.

g reptiles of the Mesozoic age; the pterodactyls; -- called also Pterodactyli, and Ornithosauria.

Of or pertaining to the Pterosauria.

Any marine saurian; esp. (Paleon.) the large extinct species of Mosasaurus, Icthyosaurus, Plesiosaurus, and related genera.

An extinct order of herbivorous dinosaurs, including the genera Stegosaurus, Omosaurus, and their allies.

A genus of large Jurassic dinosaurs remarkable for a powerful dermal armature of plates and spines.