Dracorex hogwartsia: A fantastic beast and where to find it.

The cover of the book Fantastic Beasts and Where to Find Them.

The cover of the book Fantastic Beasts and Where to Find Them.

It has been nearly 20 years since Harry Potter and The Philosopher’s Stone was released. Written by  J. K. Rowling, the book was the first of a saga about a young wizard, Harry Potter, and his friends Hermione Granger and Ron Weasley, all of whom are students at Hogwarts School of Witchcraft and Wizardry. The original seven books were adapted into an eight-part film series. In 2011, the last part of the saga, Harry Potter and the Deathly Hallows Part 2 debuted in cinemas worldwide. Now, the magic world of Harry Potter is returning to the big screen. “Fantastic Beasts and where to find it” takes place in the Harry Potter Universe almost 80 years before Harry himself enters the scene. The story follows Newt Scamander, a British wizard and magic-zoologist. After being expelled from Hogwarts, Scamander joined to the Ministry of Magic and spent two years in the Office for House-Elf Relocation before being transferred to the Beast Division. Due to his extensive knowledge of magical creatures, Augustus Worme of Obscurus Books commissioned Scamander to write the first edition of “Fantastic Beasts and Where to Find Them”.

Dracorex skeletal reconstruction (Dracorex hogwartsia) is in the permanent collection of The Children’s Museum of Indianapolis.

Skeletal reconstruction of Dracorex hogwartsia in the permanent collection of The Children’s Museum of Indianapolis (From Wikimedia Commons)

Scamander travelled to numerous cities doing research for his book and in 1926 he arrived to New York, a city full of great economic inequality and where wizards were forced to hide. Years later, Scamander worked extensively with the Dragon Research and Restraint Bureau, which led him on expeditions all over the world, collecting information for new editions of Fantastic Beasts. Published in 1927, Fantastic Beasts became an approved textbook at Hogwarts. Among the beasts included in the book are Acromantula, the Basilisk, Manticore and different types of Dragons. Most probably, Scamander would have included Dracorex hogwartsia in a new edition of the book.

Dracorex is known from one nearly complete skull discovered in the Upper Cretaceous Hell Creek Formation of South Dakota and donated to the Children’s Museum of Indianapolis in 2004. It was described by Bob Bakker and Robert Sullivan in 2006. The  name was taken from the Latin words for dragon, draco, and king, rex, and the latinized name for Hogwarts, hogwartsia. 

Dracorex skull (Image credit: The Children’s Museum of Indianapolis)

Dracorex skull (Image credit: The Children’s Museum of Indianapolis)

Dracorex is a dinosaur genus of the family Pachycephalosauridae, a diverse group of small, herbivorous dinosaurs, characterized by short forelimbs, stocky and powerful hind limbs, and a short, thick neck. Their most distinguishing feature was the development of a cranial dome, which is formed by the fusion and thickening of the frontals and parietals, and in some species, peripheral bones of the skull roof. Their remains are known from the Late Cretaceous of North America, Asia, and possibly Europe. The group include Pachycephalosaurus, Stegoceras, Stygimoloch and Prenocephale

Dracorex is similar to Pachycephalosaurus and Stygimoloch, but differs from them in having a flat skull, four-spiked squamosals, enlarged supratemporal fenestrae and a skull covered entirely with dermal ossicles (knobs, rugosities, and spikes). In a paper published in 2009 , it was suggested that “Dracorex” and “Stygimoloch” represent younger ontogenetic stages of Pachycephalosaurus. 



Bakker, R. T., Sullivan, R. M., Porter, V., Larson, P. and Saulsbury, S.J. (2006). “Dracorex hogwartsia, n. gen., n. sp., a spiked, flat-headed pachycephalosaurid dinosaur from the Upper Cretaceous Hell Creek Formation of South Dakota.” in Lucas, S. G. and Sullivan, R. M., eds., Late Cretaceous vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 35, pp. 331–345. 

Horner J.R. and Goodwin, M.B. (2009). “Extreme cranial ontogeny in the Upper Cretaceous Dinosaur Pachycephalosaurus.” PLoS ONE, 4(10): e7626

Newt Scamander. Fantastic Beasts & Where to Find Them. New York, NY: Arthur A. Levine Books, 2001

A Brief Introduction to The Hell Creek Formation.

Hell Creek e Fort Union contact, as seen at Mountain Goat Lake Butte, southwestern North Dakota (Adapted from Fastovsky and Bercovici, 2015)

Hell Creek- Fort Union contact, as seen at Mountain Goat Lake Butte, southwestern North Dakota (Adapted from Fastovsky and Bercovici, 2015)

The Hell Creek Formation (HCF), in the northern Great Plains of the United States, is the most studied source for understanding the changes in the terrestrial biota across the Cretaceous-Paleogene boundary, because preserves an extraordinary record comprised of fossil flora, vertebrates, invertebrates, microfossils, a range of trace fossils, and critical geochemical markers such as multiple iridium anomalies associated with the Chicxulub impact event. The HCF is a fine-grained, fluvially derived, siliciclastic unit, that occupies part of the western Williston Basin, and overlies the Fox Hills Formation (Clemens and Hartman, 2014).
The history of research focused on the Hell Creek Formation and its biota started in October 1901, when William T. Hornaday, director of the New York Zoological Society, travelled to northeastern Montana and discovered three fragments of the nasal horn of a Triceratops in the valley of Hell Creek. He showed the fossils to Henry Fairfield Osborn who decided to include the valley of Hell Creek on the list of areas to be prospected by Barnum Brown the following year.

Barnum Brown working in a quarry in 1902.

In July 1902, B. Brown arrived to Hell Creek. His field crew included Dr. Richard Swann Lull, and Phillip Brooks. Brown recounted that after their arrival, he found the partial skeleton that would become the type specimen of Tyrannosaurus rex. In 1904, William H. Utterback, preparator and collector for the Carnegie Museum of Natural History, collected a fragment of a jaw of Tyrannosaurus and two skulls of Triceratops. In the summer of 1906, B. Brown returned to Montana, and a year later he published a complete manuscript about the valley of Hell Creek. The field expeditions of 1908 and 1909 were crowned by the discovery of another skeleton of T-rex. Between 1902 and 1910, Osborn, Brown, and Lull published the analysis of some of the fossil vertebrates discovered in the Hell Creek Formation, including Tyrannosaurus rex, Triceratops, and Ankylosaurus.
Micrograph of Wodehouseia spinata and a specimenBisonia niemi, from the upper part of the Hell Creek Formation (Adapted from Fastovsky and Bercovici, 2015).

Micrograph of Wodehouseia spinata and a specimen Bisonia niemi, from the upper part of the Hell Creek Formation (Adapted from Fastovsky and Bercovici, 2015).

Plants are represented by fossil leaves, seeds and cones. Fossil wood is also commonly found in the HCF as permineralized fragments. The Hell Creek macroflora is largely dominated by angiosperms including palms, associated with several ferns, conifers, and single species of cycads and Ginkgo. The study of pollen and spores has played a very important role in the identification of the K/Pg boundary in the HCF. Palynologists were the first scientists to recognize that a major, abrupt change occurred at the end of the Cretaceous. Unlike the Permian-Triassic and Triassic-Jurassic boundaries, the palynologically defined K/Pg boundary is based on the extinction of Cretaceous taxa rather than the appearance of Paleocene taxa. Intimately associated with the K/Pg boundary globally, is the so-called “fern spike”, occurring exclusively at localities where the iridium anomaly is present. (Fastovsky and Bercovici, 2015; Vajda & Bercovici, 2014.)



Fastovsky, D. E., & Bercovici, A., The Hell Creek Formation and its contribution to the CretaceousePaleogene extinction: A short primer, Cretaceous Research (2015), http://dx.doi.org/10.1016/j.cretres.2015.07.007
Clemens, W. A., Jr., & Hartman, J. H. (2014). From Tyrannosaurus rex to asteroid impact: early studies (1901- 1980) of the Hell Creek Formation in its type area. In J. Hartman, K. R. Johnson, & D. J. Nichols (Eds.), Geological society of America special paper: 361. The Hell Creek Formation and the Cretaceous-tertiary boundary in the northern great plains (pp. 217-245).
Husson, D., Galbrun, B., Laskar, J., Hinnov, L. A., Thibault, N., Gardin, S., & Locklair, R. E. (2011). “Astronomical calibration of the Maastrichtian (late Cretaceous)”. Earth and Planetary Science Letters 305 (3): 328–340.doi:10.1016/j.epsl.2011.03.008
Johnson, K. R., Nichols, D. J., & Hartman, J. H. (2002). Hell Creek Formation: A 2001 synthesis. The Hell Creek Formation and the Cretaceous-Tertiary Boundary in the northern Great Plains: Geological Society of America Special Paper, 361, 503-510.