Ankylosaur

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Related to Ankylosaurs: Spinosaurus

Ankylosaur

 

armored dinosaur, suborder of the Ornithi-schia order of dinosaurs, characteristic of the Cretaceous period. Ankylosaurs were large (up to eight or nine meters long), herbivorous, four-legged reptiles. The body was broad and thick, protected from above by bony spines or shields that were joined in some ankylosaurs into a solid coat of armor, hence their other name. There were often sharp spikes at the end of the tail, which served as an active means of defense against predatory dinosaurs. Remains of ankylosaurs have been found on all the continents except Australia and Antarctica, but mainly in the Cretaceous layer of North America, Europe, and Asia. In the USSR they have been found in Central Kazakhstan and Kyzylkum.

REFERENCE

Osnovy paleontologii. Vol. 12: Zemnovodnye, presmykaiushchiesia i ptitsy. Moscow, 1964.

A. K. ROZHDESTVENSKII

References in periodicals archive ?
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.
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).