Dinosaurs
Name Status Authors Notes Avalonia Preoccupied Harry Govier Seeley Misidentified non-dinosaurian archosaur preoccupied by Walcott, 1889. Later renamed Avalonianus. Clasmodosaurus Nomen dubiumAmeghino Loncosaurus Nomen dubiumAmeghino Picrodon Misidentification.Harry Govier SeeleyMisidentified genus of dubious non-dinosaurian archosaur. May be a synonym of Avalonianus.
Plesiosaurs
New taxa
Name Status Authors Notes Megalneusaurus Valid Knight
Synapsids
Non-mammalian
Name Status Authors Age Unit Location Notes ImagesAulacocephalodonValidSeeleyAulacephalodonValidSeeleyRhachiocephalusValidSeeley
References