恐龍卡第 1969 張，共 2 027 張

Yezosaurus

名字的意思： “Yezo lizard”1

吃：肉暴龍類白堊紀晚期

Yezosaurus was a meat-eating dinosaur that lived in what is now Japan. It was a type of tyrannosaur, so it was a relative of the famous T. rex!4

生存年代

86 到 72 百萬年前4

白堊紀晚期

化石發現地

Japan (Hokkaido)2

長度

5 到 8 m (16 到 26 ft)1

高度

2.6 m (8.5 ft)

估計值

最高速度

時速約 31 公里（19 英里）

跑步, 估計值

牠生活在什麼時候？

三疊紀

侏羅紀

白堊紀

2 億 5200 萬年前20114566，小行星撞地球

牠有多大？

牠有多長？

牠有多高？

估計值

跟 8 隻狗從鼻子接到尾巴一樣長跟 44 根香蕉頭尾相接一樣長能在 12 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Yezosaurus 跟「你」比起來有多大？

只是在你的瀏覽器裡算算數學。什麼都不會被儲存或傳送出去。

牠有多快？

走路的人 時速約 5 公里 (3 mph)

騎腳踏車的小朋友 時速約 12 公里 (7 mph)

Yezosaurus 時速約 31 公里 (19 mph)

一匹飛奔的馬 時速約 65 公里 (40 mph)

一隻獵豹 時速約 100 公里 (62 mph)

酷東西

趣味知識

Yezosaurus was first thought to be a dinosaur, but later scientists realized it was actually a mosasaur, a type of marine reptile.1

The name Yezosaurus comes from Yezo, the name of a group of rocks in Japan where the fossil was found.1

The fossil of Yezosaurus was discovered in a floating concretion, a hard lump of rock, on a riverbank in Hokkaido, Japan, in 1976.1

Yezosaurus was originally called a tyrannosaur, but it is now considered a species of Taniwhasaurus, a mosasaur.1

The Japanese government declared the Yezosaurus fossil a national treasure in 1976, even before it was officially named.1

Yezosaurus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Yezosaurus 可能的樣子。這只是猜測：真正的動物可能長得不一樣，也沒有人知道牠真正的顏色。

你們都在問

關於 Yezosaurus 最常被問的問題

?Was Yezosaurus a dinosaur?

No, Yezosaurus was originally thought to be a dinosaur, but scientists now know it was actually a mosasaur, a type of extinct marine lizard.1 4

?How big was Yezosaurus?

Yezosaurus was a medium sized mosasaur. The related Taniwhasaurus reached about 6.7 meters (22 feet) long, and Yezosaurus was probably a similar size.3

?Where was Yezosaurus found?

The only Yezosaurus fossil was found in a floating concretion on a riverbank in Hokkaido, Japan, in 1976.1 4

?When did Yezosaurus live?

Yezosaurus lived during the Late Cretaceous period, about 85 to 72 million years ago.4

?Could Yezosaurus swim?

Yes, Yezosaurus was a marine reptile that swam using its powerful tail and paddle-like limbs, just like other mosasaurs.3

迷思破解王

迷思： Yezosaurus was a dinosaur.

真相： Yezosaurus was actually a mosasaur, a marine reptile, not a dinosaur.1

給恐龍專家

學名: Yezosaurus
命名者: Muramoto and Obata 19774
類群: 暴龍類
科 / 演化支: Tyrannosauridae4
分類: Theropoda > Tyrannosauroidea > Tyrannosauridae4
岩石的年代: 86 到 72 百萬年 (Santonian / Campanian)4
岩層: Kashima4
國家: 日本4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: Yezosaurus was named by Kikuwo Muramoto and Ikuwo Obata in 1977, based on a partial skull found in Hokkaido, Japan.4 1
仍有爭議: Scientists are still debating whether Yezosaurus mikasaensis is a distinct species or just an indeterminate species of Taniwhasaurus.1