Dactylioceras commune, ammonite Troodon Agriotherium was along with the

Agriotherium was along with the short-faced bear

but took only a few photographs of the first specimen of this species before it was sold

Eoraptor walked on two legs and was a relatively fast runner

ground-dwelling

Dactylioceras commune, ammonite Troodon Agriotherium was along with theDactylioceras was a widespread genus of ammonite from the Lower Jurassic period. They are generally small, averaging 2. 6 inches in diameter. Dactylioceras has a strong, ribbed shell. The ribs are slightly inclined forward, running over the outer edge, and either simple or forking at outer end. Though it eventually died out 180 million years ago, their style of ribbing was copied by numerous subsequent ammonite genera until the whole group became