Name: Homalocephale‭ (‬Even head‭).
Phonetic: Ho-mah-luh-sef-uh-lee.
Named By: Maryanska and Osmolska‭ ‬-‭ ‬1974.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Cerapoda,‭ ‬Pachycephalosauria.
Species: H.‭ ‬calathocaeros (type).
Type: Herbivore.
Size: 1.5‭ to 1.8 ‬meters long.
Known locations: Mongolia,‭ ‬Nemegt Formation.
Time period: Maastrichtian of the Cretaceous.
Fossil representation: Skull with partial skeleton.

       Homalocephale possessed broad hips,‭ ‬which has led to two theories about its lifestyle.‭ ‬One is that the wide pelvis was a sign that Homalocephale gave birth to live young,‭ ‬the extra space between the hips allowing for gestation of the foetus.‭ ‬However such an idea without further proof is considered purely speculation.‭ ‬The second is that the wide hips allowed the internal organs to sit further back in the body allowing for something called‭ ‘‬flank butting‭’‬.‭ ‬This come from the popular idea that pachycephalosaurs butted heads with each other for dominance.‭ ‬However further in depth study of pachycephalosaur skulls indicates that they were actually quite fragile and not suited for head on head butting.‭ ‬Butting the softer flanks of the opponent however would significantly reduce the risk of a head injury occurring,‭ ‬and by moving the internal organs back,‭ ‬reduce the risk of internal injury as well.
       Homalocephale had a flat top to its skull,‭ ‬hence the name‭ ‘‬even head‭’‬,‭ ‬and possessed long legs enabling it with long gait.‭ ‬Another noteworthy feature is the tail vertebrae that indicate a strong lattice work of tendons that would have kept the tail extremely rigid.
       Since its discovery it has been speculated that Homalocephale may not actually represent an adult,‭ ‬but a juvenile form of another species of pachycephalosaur,‭ ‬Prenocephale.‭ ‬This comes from increasing weight to the argument that juvenile pachycephalosaurs had flattened skulls,‭ ‬not developing the dome like appearance until reaching maturity.

Further reading
- Pachycephalosauria, a new suborder of ornithischian dinosaurs. Palaeontologia Polonica 30:45-102. - T. Maryanska & H. Osmolska - 1974.


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