Definition of nothosaurian in US English:

nothosaurian

adjective

  • See nothosaur

    • ‘Plesiosaurs became numerous and worldwide in their distribution during the Jurassic and Cretaceous periods as they further developed the basic nothosaurian pattern.’
    • ‘The shape of the pterygoid itself corresponds to the characteristic nothosaurian pattern.’
    • ‘This contrasts with the ancestral nothosaurian condition, where the girdles are proportioned more like those of generalized primitive diapsids.’