What is "pterosauria"

Ornithosauria \Or*ni`tho*sau"ri*a\, prop. n. pl. [NL. See Ornitho-, and Sauria.] (Paleon.) An order of extinct flying reptiles; -- called also {Pterosauria}.

Pterosauria \Pter`o*sau"ri*a\, n. pl. [NL.] (Paleon.) An extinct order of flying reptiles of the Mesozoic age; the pterodactyls; -- called also {Pterodactyli}, and {Ornithosauria}.

Note: The wings were formed, like those of bats, by a leathery expansion of the skin, principally supported by the greatly enlarged outer or `` little'' fingers of the hands. The American Cretaceous pterodactyls had no teeth. See Pteranodontia, and Pterodactyl.