恐龍卡第 1108 張，共 2 027 張

Machairoceratops

名字的意思： “bent sword horned face”1

吃：植物角龍類白堊紀晚期

Machairoceratops was a horned dinosaur that lived in what is now Utah, USA, about 80 million years ago. It had two long, forward-curving spikes on the back of its frill, like bent swords. This dinosaur was a plant-eater that walked on four legs.1 2

生存年代

84 到 72 百萬年前4

白堊紀晚期

化石發現地

Grand Staircase,Escalante National Monument, southern Utah, USA1 2

長度

6 到 8 m (20 到 26 ft)2

體重

1 公噸到 2 公噸 (2,200 到 4,400 lb)2

高度

2.4 m (7.9 ft)

估計值

最高速度

時速約 36 公里（22 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

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 100 隻狗一樣重跟 400 顆西瓜一樣重跟 2.5 整班小學生一樣重跟 4 隻北極熊一樣重能在 10 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Machairoceratops 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)

Machairoceratops 時速約 36 公里 (22 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

Machairoceratops had two long, forward-curving spikes on the top of its frill, each about 44 cm long. These spikes had a strange groove running from base to tip, and scientists are not sure what it was for.1 2

Its postorbital horns (above the eyes) were about 27 cm long, but they were found detached from the skull, so their exact angle is unknown.1

This dinosaur lived about 80 million years ago, during the Late Cretaceous. At that time, a huge sea split North America into two landmasses, and Machairoceratops lived on the western part called Laramidia.1 2

Machairoceratops is known from only one partial skull, found in 2006. The skull includes the braincase, left squamosal, and the unique frill bones.1

It was a centrosaurine ceratopsian, a group of horned dinosaurs that usually had large nose horns and fancy frills. Machairoceratops is one of the few centrosaurines found in the southern part of Laramidia.1 2

The name 'cronusi' refers to Cronus, a Greek god who used a curved blade. This matches the bent-sword shape of the dinosaur's frill spikes.1

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

?How big was Machairoceratops?

Scientists do not know its exact size, but its skull is very close in size to Diabloceratops, another horned dinosaur. It was a medium-sized ceratopsian, probably similar in length to a small car.1

?What did Machairoceratops eat?

It was a plant-eater (herbivore) that walked on four legs and used its beak to eat plants like ferns and cycads.1

?When did Machairoceratops live?

It lived about 80 million years ago, during the Late Cretaceous Period, in what is now Utah, USA.1

?Why does Machairoceratops have bent spikes?

The two long, forward-curving spikes on its frill looked like bent swords, which is how it got its name. Scientists are not sure exactly what they were used for, but they may have been for display or defense.1

給恐龍專家

學名: Machairoceratops
命名者: Lund et al. 20164
類群: 角龍類
科 / 演化支: Ceratopsidae4
分類: Ornithischia > Ceratopsia > Ceratopsidae4
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: Machairoceratops was named in 2016 by Eric K. Lund and colleagues. The only known fossil was found in 2006 in Grand Staircase,Escalante National Monument, Utah, and is stored at the Natural History Museum of Utah.1 2
仍有爭議: Scientists are not sure why the frill spikes have a groove along their length. It might have been for display, or something else.2