Galton & Jensen,1979
Ornithischia Ornithopoda Dryosauridae NOMINA DUBIA
This image in interesting because it shows a single-footed mount. Dadís challenge has been answered - probably many times, but he did it first. One asks how much of this mount is foam and how much is bone. That makes a great deal of difference in how difficult it is to do a single-footed mount.
Dakota Formation, South Dakota, US
H. wielandi probably represents a new but presently indeterminate ornithopod genus.