恐龍卡第 1104 張，共 2 027 張

Lythronax

名字的意思： “gore king”1 2

吃：肉暴龍類白堊紀晚期

Lythronax was an early relative of T. rex that lived about 80 million years ago. It was a fierce predator with a short, deep snout and eyes that faced forward, giving it excellent depth perception for hunting.1 2

生存年代

84 到 72 百萬年前4

白堊紀晚期

化石發現地

Utah, USA4 1

長度

7 到 8 m (23 到 26 ft)1

體重

1.5 公噸到 2.5 公噸 (3,300 到 5,500 lb)1

高度

2 m (6.6 ft)3

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？

牠有多重？

跟 1.5 台汽車一樣重

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跟 120 隻狗一樣重跟 500 顆西瓜一樣重跟 3 整班小學生一樣重跟 6 隻北極熊一樣重能在 12 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Lythronax 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)

Lythronax 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

Lythronax is the oldest known tyrannosaurid dinosaur, living about 80 million years ago.2

Its skull was wide at the back, which gave it forward-facing eyes like T. rex, but it lived millions of years earlier.1 2

The only known specimen was discovered in 2009 in the Grand Staircase-Escalante National Monument in Utah.1

Lythronax lived on a landmass called Laramidia, which was isolated by a huge inland sea.1 2

Its name means 'gore king', referring to its bloody lifestyle as a predator.1 2

Lythronax had 11 teeth in its upper jaw, fewer than some later tyrannosaurs.2

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

?How big was Lythronax?

Lythronax was about 5 to 8 metres (16 to 26 feet) long and weighed between 0.5 and 2.5 tonnes (1,100 and 5,500 pounds).1

?When did Lythronax live?

Lythronax lived around 81.9 to 81.5 million years ago, during the Late Cretaceous period.1

?Where was Lythronax found?

The only known Lythronax fossil was discovered in 2009 in the Grand Staircase, Escalante National Monument in Utah, USA.1

?What does the name Lythronax mean?

Lythronax means 'gore king', referring to its lifestyle as a predator.1

?Was Lythronax bigger than T. rex?

No, Lythronax was much smaller than T. rex. It was about 5 to 8 metres long, while T. rex could be over 12 metres long.1

?Did Lythronax have feathers?

Scientists are not sure. Earlier small tyrannosaurs had protofeathers, but it is unknown if Lythronax had them.1

?What did Lythronax eat?

Lythronax was a carnivore that ate other dinosaurs. Its forward-facing eyes gave it good depth perception for hunting.1

?How many teeth did Lythronax have?

Lythronax had 11 tooth sockets in each upper jaw bone, fewer than most later tyrannosaurs. Its front teeth were the largest, up to 13 cm (5 inches) long.1

迷思破解王

迷思： Lythronax is often thought to be a small dinosaur because it is an early relative of T. rex.

真相： Lythronax was actually about 7 to 8 meters long, similar in size to a large alligator, and was a top predator in its ecosystem.1

給恐龍專家

學名: Lythronax
命名者: Loewen et al. 20134
類群: 暴龍類
科 / 演化支: Tyrannosauridae4
分類: Theropoda > Tyrannosauroidea > Tyrannosauridae4
岩石的年代: 84 到 72 百萬年 (Campanian)4
岩層: Wahweap4
國家: 美國4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: Lythronax was named in 2013 by paleontologist Mark Loewen and his team. The only fossil was found in Utah in 2009 and includes parts of the skull, hips, and legs.1 2
仍有爭議: Scientists are not sure exactly how Lythronax is related to other tyrannosaurs, because its skeleton is incomplete.1