Named By: J. I. Kirkland & K. Carpenter - 1994.
Classification: Chordata, Reptilia, Dinosauria, Ornithischia, Thyreophora, Ankylosauria, Nodosauridae, Polacanthinae.
Species: M. maysi (type).
Size: Roughly 3 meters long.
Known locations: USA, Colorado - Morrison Formation.
Time period: Kimmeridgian to Tithonian of the Jurassic.
Fossil representation: Disarticulated skull and post cranial remains of three individuals.
the time of its description, Mymoorapelta was the
first Jurassic aged
to be discovered in North America. Since this description
however, other have questioned exactly what kind of ankylosaur
Mymoorapelta was. Mymoorapelta
does not have a tail club like
ankylosaurids, meaning that it was more likely a nodosaur. The
original describers considered Mymoorapelta to be a
nodosaur, while other studies suggest it is a more basal nodosaur.
The armour of Mymoorapelta was intended to provide protection from Jurassic age predators such as Allosaurus and Saurophaganax, which may have left living Mymoorapelta alone in favour of hunting ‘softer’ targets such as ornithopods like Camptosaurus. However, evidence of Allosaurus attacks on other kinds of armoured dinosaurs such as Stegosaurus suggests that nodosaurs like Mymoorapelta may have also been bothered by theropods from time to time.
In 1998 another nodosaur named Gargoyleosaurus was also named from fossils recovered from the Morrison Formation.
- North America's first pre-Cretaceous ankylosaur (Dinosauria) from the Upper Jurassic Morrison Formation of western Colorado, J. I. Kirkland and K. Carpenter - 1994.
- Phylogeny of the ankylosaurian dinosaurs (Ornithischia: Thyreophora, Richard S. Thompson, Jolyon C. Parish, Susannah C. R. Maidment & Paul M. Barrett - 2011.