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Temporal range: Late Jurassic, 155–150Ma
Mymoorapelta maysi.jpg
Cast in Wyoming Dinosaur Center
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Family: Nodosauridae
Subfamily: Polacanthinae
Genus: Mymoorapelta
Kirkland et Carpenter, 1994
Species: † M. maysi
Binomial name
Mymoorapelta maysi
Kirkland et Carpenter, 1994

Mymoorapelta ("Shield of Mygatt-Moore") is an ankylosaur from the Late Jurassic (Kimmeridgian-Tithonian) Morrison Formation (Brushy Basin Member) of western Colorado, USA. The taxon is known from portions of a disarticulated skull, parts of three different skeletons and other postcranial remains. It is present in stratigraphic zones 4 and 5 of the Morrison Formation.[1]


Cast at Makuhari Messe

There is some controversy as to this ankylosaur's position within the Ankylosauria. Vickaryous et al. (2004) considered it Ankylosauria incertae sedis, while Kirkland et Carpenter (1994) placed it within the Family Polacanthidae. A new cladistic analysis performed by Thompson et al., 2011 suggests that Mymoorapelta is a basal nodosaurid.[2] To date, only a single species has been named for this taxon, M. maysi. Along with Gargoyleosaurus parkpinorum, Mymoorapelta is one of the earliest known ankylosaurs, providing a look at the early evolution and diversification of this group of dinosaurs.

See also[edit]


  1. ^ Foster, J. (2007). "Appendix". Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. pp. 327–329. 
  2. ^ Richard S. Thompson, Jolyon C. Parish, Susannah C. R. Maidment and Paul M. Barrett (2011). "Phylogeny of the ankylosaurian dinosaurs (Ornithischia: Thyreophora)". Journal of Systematic Palaeontology. in press. doi:10.1080/14772019.2011.569091. 


  • Carpenter, K.; Kirkland, J. I., Birge, D., and Bird, J. (2001). "Disarticulated skull of a new primitive ankylosaurid from the Lower Cretaceous of Utah". In Carpenter, K. (editor). The Armored Dinosaurs. Indiana University Press. 
  • Kirkland, J. I.; K. Carpenter (1994). "North America's first pre-Cretaceous ankylosaur (Dinosauria) from the Upper Jurassic Morrison Formation of western Colorado". Brigham Young University Geology Studies (40): pp. 25-42. 
  • Vickaryous, Maryanska, and Weishampel (2004). "Ankylosauria". In Weishampel, D. B., Dodson, P., and Osmólska, H. (editors). The Dinosauria. University of California Press.