Acrotholus
David C. Evans & et al.
Its name means "highest dome". Its oval dome is up to 55 mm thick.
Photo: Nobu Tamura email:nobu.tamura@yahoo.com http://spinops.blogspot.com/ http://paleoexhibit.blogspot.com/ (CC BY-SA 4.0)
Their skull roof thickened into a solid dome of bone. These plant-eating dinosaurs walked on two legs and lived in Asia and North America in the Late Cretaceous. They are known mostly from skulls because the dome fossilises well. It probably served for display or for contests between members of the same kind.
A few cards of the album
The start of their anecdote. The album's other cards are for you to discover in the game.
Alaskacephale
Sullivan
A dome-headed dinosaur living in the Arctic of its day, in northern Alaska. Only a single skull bone is known, found in 1999.
Photo: Fred Wierum (CC BY 4.0)
Amtocephale
All that remains of it is a skull dome 5.3 cm long and 1.9 cm thick. Yet it is the toughest bone of a pachycephalosaur skeleton and often the only one to fossilize.
Photo: Levi Martinez-Reza (CC BY-SA 3.0)
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