恐龍卡第 1651 張，共 2 027 張

Siamotyrannus

名字的意思： “Siamese tyrant”1

吃：肉肉食恐龍白堊紀早期

Siamotyrannus was a big meat-eating dinosaur that stomped through ancient Thailand. It had strong legs and sharp teeth, and it hunted other animals. Scientists are still figuring out exactly what kind of theropod it was!1

生存年代

126 到 121 百萬年前4

白堊紀早期

化石發現地

Thailand, in the Sao Khua Formation1 4

長度

6 到 10 m (20 到 33 ft)1

體重

500 kg 到 1.75 公噸 (1,100 到 3,900 lb)1

高度

2 m (6.6 ft)3

最高速度

時速約 37 公里（23 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？

牠有多重？

跟 1 台汽車一樣重

跟 2 台汽車排成一排一樣長跟 56 根香蕉頭尾相接一樣長跟 88 隻狗一樣重跟 350 顆西瓜一樣重跟 92 個幼兒園小朋友一樣重跟 55 個小學生一樣重跟 4 隻北極熊一樣重能在 9.7 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Siamotyrannus 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)

Siamotyrannus 時速約 37 公里 (23 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

Siamotyrannus lived about 125 to 121 million years ago, during the Early Cretaceous period.1 2

Its fossil includes part of the pelvis, back vertebrae, and tail vertebrae, but no skull has been found yet.1

Siamotyrannus had two vertical ridges on its hip bone, a feature that may be unique to this dinosaur.1 2

Even though its name means 'Siamese tyrant', scientists now think it might not be a true tyrannosaur. Some studies place it with allosaurs or other meat-eaters.1

The first fossil was found in 1993 by a man named Somchai Traimwichanon at a site in Thailand.1

Some scientists think Siamotyrannus was closely related to another dinosaur called Siamraptor, which also lived in Thailand.1

Siamotyrannus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Siamotyrannus 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 Siamotyrannus 最常被問的問題

?How big was Siamotyrannus?

Scientists are not sure, but estimates range from about 6 meters (20 feet) to 10 meters (33 feet) long, and it may have weighed between 500 kg and 1.75 tonnes.1

?Was Siamotyrannus a tyrannosaur?

Probably not. Even though its name means 'Siamese tyrant', most scientists now think it was an allosauroid or a close relative of Siamraptor, not a true tyrannosaur.1

?What did Siamotyrannus eat?

It was a meat-eater. It had sharp teeth and strong legs to hunt other animals.4

?When did Siamotyrannus live?

It lived during the Early Cretaceous period, about 145 to 120 million years ago.1

?Where was Siamotyrannus found?

Its fossils were found in Thailand, at the Phu Wiang 9 site in Khon Kaen province.1

?Did Siamotyrannus have a skull?

No skull has been found yet. The only fossils discovered are part of the pelvis, back vertebrae, and tail vertebrae.1

迷思破解王

迷思： Siamotyrannus was a true tyrannosaur, like T. rex.

真相： Scientists now think it may not be a tyrannosaur at all. Many studies place it with allosauroids or other theropods, and its exact family is still debated.1

給恐龍專家

學名: Siamotyrannus
命名者: Buffetaut et al. 19964
類群: 肉食恐龍
科 / 演化支: Metriacanthosauridae4
分類: Theropoda > Allosauroidea4
岩石的年代: 126 到 121 百萬年 (Barremian)4
岩層: Sao Khua4
國家: 泰國4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: In 1993, Somchai Traimwichanon found a partial skeleton at Phu Wiang 9 in Thailand. In 1996, Eric Buffetaut, Varavudh Suteethorn, and Haiyan Tong named it Siamotyrannus isanensis.1 4
仍有爭議: Scientists still debate what group Siamotyrannus belongs to. It might be an allosauroid, a primitive coelurosaur, or something else entirely.1