Pachycephalosaur dinosaurs such as Pachycephalosaurus and Stegoceras

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Dinosaur Jungle   >   Dinosaur Facts   >   Classification   >   Ornithischia   >   Pachycephalosaurs

Pachycephalosaur Dinosaurs



Scientific Classification
  Kingdom Animalia
  Phylum Chordata
  Class Sauropsida
  Superorder Dinosauria
  Order Ornithischia
  Suborder Cerapoda
  (unranked) Marginocephalia
  Infraorder Pachycephalosauria
The Pachycephalosauria (meaning "thick-headed lizards") are an infraorder of dinosaurs, that were characterized by having bony domes on their heads. The Pachycephalosauria infraorder, together with the infraorders of Ceratopsia ("horned faces") and Ornithopoda ("bird feet"), form the the suborder Cerapoda of the Ornithischian dinosaurs. Pachycephalosaurs are sometimes grouped together with Ceratopsian as the Marginocephalia ("fringed heads"), since the these two infraorders share some common features and appear to be related.

Pachycephalosaurs probably first appeared during the the Jurassic period (when they originated remains a subject of research and debate), and survived until the end of the Cretaceous period. Some Pachycephalosaurs would have been among the last non-avian dinosaurs which died out during the mass extinction which took place about 65 million years ago.

Dinosaur Classification

All Pachycephalosaurs were herbivores (plant-eaters) and were bipedal (walked on two legs).

The feature that Pachycephalosaurs are best known for, and the defining characteristic of the group is the bony roofs of their skulls. All Pachycephalosaurs had skulls like this, although the exact size and shape did vary between species. In some species of Pachycephalosaurs, the skull has a bony dome several inches thick, in some the skull is flat or wedge-shaped, and in several species their are bony knobs/horns on the skull.

The purpose of Pachycephalosaurs' skull adaptations have been a subject of much debate - it has in the past been asserted that animals must have engaged in head-on butting contests for mates (like thick-headed sheep and other animals do today), but the structure of the neck (which could not have been orientated in a straight line would have made it poor for transmitting force) and the shape of the domes (rounded domes would have resulted in glancing blows which transmitted force poorly) seems to refute this hypothesis. If not used for head-on butting, the bony domes could perhaps have been used for flank butting - the structure of the horns in some species of Pachycephalosaurs seems to be consistent with this hypothesis.

dinosaur picture pachycephalosaurus

Pachycephalosaur Timeline:



Pachycephalosaurs first appeared during the Jurassic, perhaps about 150 million years ago, and survived until the end of the Cretaceous period, about 65 million years ago

Pachycephalosaurs first appeared during the Jurassic, perhaps about 150 million years ago, and survived until the end of the Cretaceous period, about 65 million years ago

Types of Pachycephalosaurs



Here is a list of some Pachycephalosaurs:

Dinosaur

Pachycephalosaurus
Pachycephalosaurus
 

Prenocephale
Prenocephale
 

Stegoceras
Stegoceras
 


Related Information & Resources


See Also


Pachycephalosaur Books


Here are some books from Amazon.com:

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Fierce Dinosaurs: Pachycephalosaurs and Ceratopsians (Dino Explorers)
By Clare Hibbert

Enslow Publishing
Released: July 30th, 2018
Paperback (32 pages)

Fierce Dinosaurs: Pachycephalosaurs and Ceratopsians (Dino Explorers)
Lowest New Price: $11.53*
Temporarily out of stock. Order now and we'll deliver when available. We'll e-mail you with an estimated delivery date as soon as we have more information. Your account will only be charged when we ship the item.*
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Description:
Fierce Dinosaurs: Pachycephalosaurs and Ceratopsians (Dino Explorers)
  • Manufacturer: Enslow Pub Inc
  • Brand: Enslow Publishing
  • ISBN: 1978500092
  • EAN: 9781978500099
Details:
  • Paperback
  • Number of Pages: 32
  • Author: Clare Hibbert
  • Publication Date: July 30th, 2018
  • Release Date: July 30th, 2018
Physical Description:
  • Size: 11.0 inches by 8.25 inches by 0.25 inches
  • Weight: 0.29982867632 Pounds
Click here for more information
Armored, Plated, and Bone-Headed Dinosaurs: The Ankylosaurs, Stegosaurs, and Pachycephalosaurs (The Dinosaur Library)
By Thom Holmes

Brand: Enslow Publishers
Released: January 1st, 2002
Library Binding (128 pages)

Armored, Plated, and Bone-Headed Dinosaurs: The Ankylosaurs, Stegosaurs, and Pachycephalosaurs (The Dinosaur Library)
List Price: $28.27*
Lowest Used Price: $9.16*
In Stock*
*(As of 09:51 Pacific 7 Dec 2024 More Info)


Click Here
Description:
Armored, Plated, and Bone-Headed Dinosaurs: The Ankylosaurs, Stegosaurs, and Pachycephalosaurs (The Dinosaur Library)
  • Manufacturer: Enslow Pub Inc
  • Brand: Brand: Enslow Publishers
  • ISBN: 0766014533
  • EAN: 9780766014534
Details:
  • Product Category: Library Binding
  • Number of Pages: 128
  • Authors: Thom Holmes, Laurie Holmes
  • Publication Date: January 1st, 2002
  • Release Date: January 1st, 2002
Physical Description:
  • Size: 9.5 inches by 6.5 inches by 0.75 inches
  • Weight: 0.9 Pounds
Features:
  • Used Book in Good Condition
Click here for more information
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