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008

Huayangosaurus taibaii

OLogy Series
extinct animal
card
008

Huayangosaurus taibaii

OLogy Series
extinct animal

As you can tell from its body plates and tail spikes, Huayangosaurus is related to Stegosaurus. Unlike Stegosaurus, though, this dinosaur had a shorter snout. It lived during the Middle Jurassic in a part of what is now China.

Which characteristic separates Huayangosaurus from all other stegosaurs?

teeth in the front of the jaws

spikes on its tail

plates on its back

Are you right?

Correct!

When stegosaurs evolved after Huayangosaurus, they no longer had teeth in the front of their jaws.

Huayangosaurus is the most primitive stegosaur. This means:

it has features most like the first stegosaur

Huayangosaurus is the first stegosaur

the other stegosaurs were ashamed to talk to it

Are you right?

Correct!

The fossil record is incomplete. We can never know which was first stegosaur. Scientists believe Huayangosaurus was most like the first stegosaur.

Huayangosaurus, like some other stegosaurs, had huge spines sticking out from its shoulders.

Fact
or
Fiction
?

Fact

The spines were probably used as protection against predators or to fight other Huayangosaurus.

Scientific Name: Huayangosaurus taibaii
Pronunciation: HWAH-YAHNG-o-SAW-rus TIE-bay-eye
Meaning: "early Sichan lizard"
Locality Found: Sichuan, China
Age: Middle Jurassic, 180 to 160 million years ago
Length: 4 meters (13.5 feet) long
Weight: 1,360 kilograms (3,000 pounds)
Characteristics: This creature is known as a primitive stegosaur that had plates, spines, and teeth in the front of its mouth.

Image credits: Rick Spears.