Mecheon
Sacabambaspis
For a while there they fell into the mis-named category.
I know too, too much about the Brontosaurus thing
(B excelsus, the thing you think of when you hear 'Brontosaurus', has always existed, just it was thought it was close enough to Apatosaurus to instead be A excelsus, as opposed to A ajax, the thing you think of when you hear Apatosaurus. But now recent work shows they're different enough to be separate, but two things we thought were different enough are now more Brontosaurus)