Ankylosaurus vs Stegosaurus

A detailed side-by-side comparison of Ankylosaurus and Stegosaurus, covering size, diet, classification, geologic period, and discovery history.

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Side-by-Side Comparison

الخاصية Ankylosaurus Stegosaurus
الاسم العلمي Ankylosaurus magniventris Stegosaurus stenops
التصنيف Ankylosauria Stegosauria
الحقبة Cretaceous Late Jurassic Late
النظام الغذائي Herbivore Herbivore
الطول 10.0 m 9.0 m
Height 1.7 m 4.0 m
الوزن 6.0 t 5.0 t
سنة الاكتشاف 1908 1877
موقع الاكتشاف Hell Creek Formation, Montana, USA Morrison, Colorado, USA
سُمي بواسطة Barnum Brown Othniel Charles Marsh
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Size Comparison

Ankylosaurus 10.0 m

about as long as 2 cars end-to-end

Stegosaurus 9.0 m

roughly the length of a large SUV

Weight Comparison

Ankylosaurus 6.0 t

about the weight of 1.0 elephants

Stegosaurus 5.0 t

about the weight of 0.8 elephants

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Timeline Comparison

Ankylosaurus
100,5 Mya Cretaceous Late (Mesozoic) 66,0 Mya
Stegosaurus
161,5 Mya Jurassic Late (Mesozoic) 145,0 Mya
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Diet Comparison

Ankylosaurus

Herbivore

Ankylosaurus was a plant-eater, feeding on vegetation like ferns, conifers, and cycads.

Stegosaurus

Herbivore

Stegosaurus was a plant-eater, feeding on vegetation like ferns, conifers, and cycads.

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Classification Comparison

Ankylosaurus

Clade: Thyreophora

Group: Ankylosauria

(Fused lizards)

Stegosaurus

Clade: Thyreophora

Group: Stegosauria

(Plated dinosaurs)

Both dinosaurs share a common ancestor within the Thyreophora clade.

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الاختلافات الرئيسية

  • Ankylosaurus (10 m, ~6,000 kg) and Stegosaurus (9 m, ~5,000 kg) were similar in size but very different in armor design.
  • Ankylosaurus had a massive tail club capable of shattering bone; Stegosaurus had a spiked tail (thagomizer) for slashing.
  • Ankylosaurus was covered in osteoderms (bone embedded in skin); Stegosaurus had large upright plates along its back.
  • Stegosaurus lived in the Late Jurassic; Ankylosaurus lived in the Late Cretaceous — separated by ~80 million years.
  • Both were quadrupedal herbivores relying on passive and active defense rather than flight from predators.
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Did You Know?

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Both Ankylosaurus and Stegosaurus were herbivores.

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Ankylosaurus lived during the Cretaceous Late while Stegosaurus lived during the Jurassic Late, separated by roughly 96 million years.

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Stegosaurus was discovered 31 years earlier, in 1877.

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Ankylosaurus belonged to Ankylosauria while Stegosaurus belonged to Stegosauria.

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