恐龍卡第 0891 張，共 2 027 張

Istiorachis

名字的意思： “sail spine”1

吃：植物有喙的草食恐龍白堊紀早期

Istiorachis was a plant-eating dinosaur that lived on the Isle of Wight over 120 million years ago. It had a tall sail on its back made of long spines, which might have helped it show off to other dinosaurs. It was about the size of an American bison and weighed as much as a small car.2

生存年代

133 到 121 百萬年前4

白堊紀早期

化石發現地

Isle of Wight, England, UK1 2

體重

1 公噸 (2,200 lb)2

高度

2 m (6.6 ft)2

最高速度

時速約 33 公里（21 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？

牠有多高？

牠有多重？

跟 50 隻狗一樣重

跟 200 顆西瓜一樣重跟 53 個幼兒園小朋友一樣重跟 31 個小學生一樣重跟 2 隻北極熊一樣重能在 11 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Istiorachis 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)

Istiorachis 時速約 33 公里 (21 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

Istiorachis had very long spines on its back and tail bones, making a sail-like structure that was probably used for showing off to mates or scaring predators.1

Its name honors Dame Ellen MacArthur, a famous sailor from the Isle of Wight who sailed solo around the world.1

The only known fossil of Istiorachis was found in a plant debris bed near Grange Chine on the Isle of Wight.1

Some of the skeleton was stolen by poachers before scientists could collect it.1

Istiorachis belonged to a group of dinosaurs called iguanodontians, which were common in the Early Cretaceous.2

The sail of Istiorachis was made of neural spines that were over four times taller than the main part of the backbone.1

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

?How big was Istiorachis?

It was about the size of an American bison, stood around two metres tall, and weighed about one tonne (1,000 kilograms).2

?What did Istiorachis eat?

It was a plant-eating dinosaur, so it ate plants like ferns, cycads and conifers that grew in its warm, forested environment.3

?Why did Istiorachis have a sail?

Scientists think the sail was mostly used for signalling, such as attracting mates or scaring predators, rather than for controlling body temperature.2 1

?When did Istiorachis live?

It lived more than 120 million years ago, during the Early Cretaceous Period (specifically the Barremian age).2 3

給恐龍專家

學名: Istiorachis
命名者: Lockwood et al. 20254
類群: 有喙的草食恐龍
科 / 演化支: Styracosterna4
分類: Ornithischia > Ornithopoda > Iguanodontia4
岩石的年代: 133 到 121 百萬年 (Hauterivian / Barremian)4
岩層: Wessex4
國家: 英國4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: Istiorachis was named in 2025 by Jeremy Lockwood, David Martill, and Susannah Maidment. The fossil was dug up by Nicholas Chase from the Wessex Formation on the Isle of Wight.1
仍有爭議: Scientists are not sure exactly what the sail was used for. It might have helped with walking on four legs, or it might have been for showing off to other dinosaurs.1