Nicknamed 'thorny head,' the Akainacephalus johnsoni belongs to the armored ankylosaur
family of dinosaurs, which have been found in southwestern United States.
Paleontologists from Canada's Royal Ontario Museum (ROM) discovered the remains of a new species of dinosaur in the Judith River Formation of northern Montana, an ankylosaur
that resembles the fictional monster Zuul from the 1984 movie, "Ghostbusters."
He thinks the club of one kind of ankylosaur
looked like a head to its enemies.
These remains have been assigned to the ankylosaur
Struthiosaurus on the basis of features observed in the lower jaw, synsacrum, pelvis, and dermal armour (Pereda Suberbiola et al., 1995; Garcia and Pereda Suberbiola, 2003).
Victoria Arbour visited dinosaur fossil collections from Alberta to the UK, examining skull armour and comparing those head details with other features of the fossilized ankylosaur
, a family of squat, armour plated, plant eaters, remains.
After conversations with Josep Montane and revision of the MNCN collections, we could claim that this latter locality probably yielded the ankylosaur
bones reported by Escaso et al.
"Canadian Club," an ankylosaur
, took 36 percent of the votes cast.
Amateur and professional paleontologists on a dig in Colorado last summer found the specimen in 142-million-year-old rocks from the late Jurassic period, making it the oldest known ankylosaur
in North America, says excavation leader James Kirkland, who announced the discovery this week.
As happened with sauropod and thyreophoran tracks (such as those of ankylosaurs
), the distinction between them is not obvious when dealing with tracks that do not preserve anatomical characters, such as digit marks.
(1998): A Polacanthine ankylosaur
(Ornithischia: Dinosauria) from the Early Cretaceous (Barremian) of eastern Utah.
Stegosaurs had bony back plates and tail spikes, and ankylosaurs
sported heavily armoured bodies and bony tail clubs.
The dorsal vertebrae of La Yesa specimen have the ventral surfaces of the prezygapophyses fused where they meet on the midline, forming a concave, continuous U-shaped surface, as occurs commonly in stegosaurs and, convergently, in ankylosaurs
(Maidment et al, 2008).