Temporal range: Late Cretaceous
Homalocephale body
An artist's illustration of Homalocephale calathocercos
Scientific classification
Kingdom: Animalia
Phylum: Chordata
clade: Dinosauria
Order: Ornithischia
Suborder: Pachycephalosauria
Family: Pachycephalosauridae
Genus: Homalocephale
Maryanska & Osmolska, 1974
Species: H. calathocercos
Binomial name
Homalocephale calathocercos
Maryanska & Osmolska, 1974

Homalocephale (from Greek ωμαλος, homalos, "even", and κεφαλή, kephalē, "head") is a genus of dinosaur belonging to the pachycephalosaurid family, which lived during the late Cretaceous period of what is now Mongolia, 80 million years ago. The genus was described in 1974 by Osmólska & Maryañska, and consists of a single species, H. calathocercos, though this may be a synonym (and juvenile form) of Prenocephale. Homalocephale was 1.8 metres (6 ft) long[1] and herbivorous.[2]


Unlike other definitely adult pachycephalosaurs (though similar to probable juvenile specimens referred to Dracorex and Goyocephale), Homalocephale sported a flat, wedge-shaped skull roof. Nonetheless, the surface of the skull was fairly thickened. It is unknown of Homalocephale actually participated in active ramming against members, or it's relatively thinner dome was built for something else.

The species is also noted for having an unusually broad pelvis, which lead some paleontologists to suggest that the wide hips were for giving birth to live young. Others have suggested that the width served to protect vital organs from harm during flank-butting.[3] Homalocephale also had rather long legs, indicating a fast-moving gait.

The type species, H. calathocercos, was described from an incomplete skull and postcranial material. The specimen has large openings on the top of the skull, a distinct frontoparietal suture, low and long infratemporal fenestrae, and a large, round eye socket. The forehead is notably rough, with multiple nodules on the lateral and posterior sides of the squamosal bone. Palaeontologists concluded that the specimen was an adult, despite the fact that the sutures are discernible and that it had a flat skull (a juvenile trait in many pachycephalosaurid species). In 2010, a study by Nick Longrich and colleagues suggested that flat-headed pachycephalosaurs were just juvenile forms of dome-headed adults, a view also supported by the earlier analysis of Horner and Goodwin in 2009. Longrich and colleagues suggested that Homalocephale is actually the juvenile or sub-adult stage of Prenocephale, although sources waver towards each side.

In the Media[]

  • Homalocephale can be created from paleo-DNA in the game Jurassic Park III: Park Builder.
  • Homalocephale was featured as a three-star small herbivore in the videogame Jurassic Park: Operation Genesis. They are coated with dark blue or black while underparts are white or gray. The flat head dome is red. They spend most of the time in the open areas with tall vegetation. They live in large groups and are very rarely found alone. For some reason, they are defenceless and cannot attack enemies with their heads, unlike their cousins Pachycephalosaurus. They are also friends with Pachycephalosaurus, but often extend their trust to other herbivores they can rely on such as sauropods like Brachiosaurus.[4]
  • Homalocephale appeared in the video game Jurassic World: Evolution. The variant designed in the game was dubbed as one of the cutest dinosaurs ever.
  • Homalocephale will be making an appearance in The Isle.
  • Homalocephale appears in Jurassic World: Alive as an Omega rarity herbivore.




  1. Holtz, Thomas R. Jr. (2008) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages Supplementary Information
  2. Maryańska, Teresa; Chapman, Ralph E.; Weishampel, David B. (2004). "Pachycephalosauria". In Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.). The Dinosauria (2nd ed.). Berkeley: University of California Press. pp. 464–477. ISBN 0-520-24209-2. 
  3. Carpenter, Kenneth (1997). "Agonistic behavior in pachycephalosaurs (Ornithischia:Dinosauria): a new look at head-butting behavior". Contributions to Geology 32 (1): 19–25. 
  4. Longrich, N.R., Sankey, J. and Tanke, D. (2010). "Texacephale langstoni, a new genus of pachycephalosaurid (Dinosauria: Ornithischia) from the upper Campanian Aguja Formation, southern Texas, USA."