Allosaurus vs Irritator

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

Side-by-Side Comparison

Properti Allosaurus Irritator
Nama Ilmiah Allosaurus fragilis Irritator challengeri
Klasifikasi Theropoda Spinosauridae
Periode Jurassic Late Cretaceous Early
Diet Carnivore Piscivore
Panjang 9.7 m 8.0 m
Height 3.5 m 2.5 m
Berat 2.3 t 1.0 t
Tahun Penemuan 1877 1996
Lokasi Penemuan Garden Park, Colorado, USA Santana Formation, Brazil
Dinamai Oleh Othniel Charles Marsh David Martill et al.

Size Comparison

Allosaurus 9.7 m

roughly the length of a large SUV

Irritator 8.0 m

roughly the length of a large SUV

Weight Comparison

Allosaurus 2.3 t

comparable to 2.3 small cars

Irritator 1.0 t

comparable to 1.0 small cars

Timeline Comparison

Allosaurus
161,5 Mya Jurassic Late (Mesozoic) 145,0 Mya
Irritator
145,0 Mya Cretaceous Early (Mesozoic) 100,5 Mya

Diet Comparison

Allosaurus

Carnivore

Allosaurus was a meat-eating predator, hunting other animals for food.

Irritator

Piscivore

Irritator was a fish-eater, specialized in catching aquatic prey.

Classification Comparison

Allosaurus

Clade: Saurischia

Group: Theropoda

(Beast feet)

Irritator

Clade: Theropoda

Group: Spinosauridae

(Spine lizards)

Did You Know?

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Allosaurus weighed roughly 2x more than Irritator.

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Allosaurus was a carnivore while Irritator was a piscivore.

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Allosaurus lived during the Jurassic Late while Irritator lived during the Cretaceous Early, separated by roughly 0 million years.

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Allosaurus was discovered 119 years earlier, in 1877.

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Allosaurus belonged to Theropoda while Irritator belonged to Spinosauridae.

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