Ankylosaurus (10 m, ~6,000 kg) was larger than Sauropelta (5.2 m, ~1,500 kg).
Ankylosaurus had a bone-crushing tail club; Sauropelta was a nodosaurid without a tail club, relying on armor and shoulder spikes instead.
Sauropelta lived in the Early Cretaceous; Ankylosaurus lived in the Late Cretaceous.
Sauropelta had prominent cone-shaped shoulder spines for lateral defense; Ankylosaurus had flatter, more integrated osteoderms.
Both were quadrupedal herbivores with extensive bony armor, but they represent two different ankylosaur families (ankylosauria vs nodosauridae).
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Did You Know? fun facts
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Did You Know?
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Ankylosaurus was about 1.9x longer than Sauropelta.
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Ankylosaurus weighed roughly 4x more than Sauropelta.
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Both Ankylosaurus and Sauropelta were herbivores.
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Ankylosaurus lived during the Cretaceous Late while Sauropelta lived during the Cretaceous Early, separated by roughly 79 million years.
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Ankylosaurus was discovered 62 years earlier, in 1908.
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Both belong to the Ankylosauria clade, making them relatively close relatives.
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Related comparisons
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