Amargasaurus vs Pachycephalosaurus

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

Side-by-Side Comparison

คุณสมบัติ Amargasaurus Pachycephalosaurus
ชื่อวิทยาศาสตร์ Amargasaurus cazaui Pachycephalosaurus wyomingensis
การจำแนกประเภท Sauropoda Pachycephalosauria
ยุคสมัย Cretaceous Early Cretaceous Late
อาหาร Herbivore Herbivore
ความยาว 10.0 m 4.5 m
Height 2.5 m 1.8 m
น้ำหนัก 2.6 t 450 kg
ปีที่ค้นพบ 1991 1943
สถานที่ค้นพบ La Amarga Formation, Argentina Montana, USA
ตั้งชื่อโดย Leonardo Salgado & Jose Bonaparte Barnum Brown & Erich Schlaikjer

Size Comparison

Amargasaurus 10.0 m

about as long as 2 cars end-to-end

Pachycephalosaurus 4.5 m

roughly the length of a large SUV

Weight Comparison

Amargasaurus 2.6 t

comparable to 2.6 small cars

Pachycephalosaurus 450 kg

about 6 adult humans

Timeline Comparison

Amargasaurus
145.0 Mya Cretaceous Early (Mesozoic) 100.5 Mya
Pachycephalosaurus
100.5 Mya Cretaceous Late (Mesozoic) 66.0 Mya

Diet Comparison

Amargasaurus

Herbivore

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

Pachycephalosaurus

Herbivore

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

Classification Comparison

Amargasaurus

Clade: Sauropodomorpha

Group: Sauropoda

(Lizard feet)

Pachycephalosaurus

Clade: Ornithischia

Group: Pachycephalosauria

(Thick-headed lizards)

Did You Know?

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Amargasaurus was about 2.2x longer than Pachycephalosaurus.

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Amargasaurus weighed roughly 6x more than Pachycephalosaurus.

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Both Amargasaurus and Pachycephalosaurus were herbivores.

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Amargasaurus lived during the Cretaceous Early while Pachycephalosaurus lived during the Cretaceous Late, separated by roughly 0 million years.

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Pachycephalosaurus was discovered 48 years earlier, in 1943.

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Amargasaurus belonged to Sauropoda while Pachycephalosaurus belonged to Pachycephalosauria.

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