DinoNaviDinosaur & Prehistoric Life Encyclopedia
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Compare prehistoric life

Estimated lengths only; this chart does not represent posture or height. Species from different periods may appear together and did not necessarily coexist.

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Estimated length
Attributes for two to four entries (missing values are unknown)
Attribute
Stegosaurus
StegosaurusStegosaurus stenopsDIN-000004
Allosaurus
AllosaurusAllosaurus fragilisDIN-000006
Estimated lengthUnknownUnknown
Height (posture dependent)UnknownUnknown
Estimated massUnknownUnknown
PeriodUnknownUnknown
Age (million years ago)UnknownUnknown
Discovery regionUnknownUnknown
DietUnknownUnknown
ClassificationDinosaurDinosaur
Quality / sourcesSee source and review notes in details · Stegosaurus · World’s most complete Stegosaurus goes on show · Weight of the world’s most complete Stegosaurus revealedSee source and review notes in details · Allosaurus

Research-based estimates · Length and height are different measures. Candidate classifications and estimates may remain provisional. Check each source account.

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  • Adult in the Morrison floodplain with time and region identified.

    Stegosaurus: The Mystery of Its Plates and Spiked Tail

    Around 150 million years ago, a striking herbivorous dinosaur walked across the river plains of western North America. Two staggered rows of large plates rose from its back, while four sharp spikes armed the tip of its tail. These structures have become the visual signature of Stegosaurus. But did the plates and spikes serve the same purpose? The fossil evidence tells a more complicated story.