恐龍卡第 0462 張，共 2 027 張

Cryopterygius

名字的意思： “cold or frozen fin”1

吃：肉魚龍類侏羅紀晚期到白堊紀早期嚴格來說不是恐龍

Cryopterygius was a large, fish-shaped marine reptile that lived in the chilly seas near the North Pole during the Late Jurassic. It was an ichthyosaur, not a dinosaur, and its fossil was dug out of permafrost, which is frozen ground.1

趣味小知識：這種海生爬蟲類在海裡游泳的時候，恐龍正在陸地上走路。大家都叫牠們恐龍，但牠們其實是爬蟲類的另一個分支。

生存年代

149 到 143 百萬年前4

侏羅紀晚期到白堊紀早期

化石發現地

Spitsbergen, Svalbard, Norway, and also in Poland1 4

長度

5 到 5.5 m (16 到 18 ft)2 3

最高速度

時速約 45 公里（28 英里）

游泳, 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？

跟 6 隻狗從鼻子接到尾巴一樣長跟 31 根香蕉頭尾相接一樣長能在 4 秒內游完一座大泳池（50 公尺）

Cryopterygius 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)

Cryopterygius 時速約 45 公里 (28 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

The name Cryopterygius means 'cold fin' or 'frozen fin' because it was found in frozen ground in a very cold place.1

Its skeleton was nearly complete and still joined together, which is very rare for an ichthyosaur fossil.1

Cryopterygius had 52 vertebrae in front of its hips, which is a lot for an ichthyosaur.1

Its upper arm bone, the humerus, had only two bumps at the end where it connected to the rest of the fin.1

It lived in the Late Jurassic, about 149 to 143 million years ago, in the cold polar seas.4

Scientists found a complete left hip and leg, which helped them understand how ichthyosaurs moved their hind fins.1

Cryopterygius 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Cryopterygius 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。

給恐龍專家

學名: Cryopterygius
命名者: Druckenmiller et al. 20124
類群: 魚龍類
科 / 演化支: Ophthalmosauridae4
分類: Ichthyosauria > Ichthyosauromorpha4
岩石的年代: 149 到 143 百萬年 (Tithonian)4
岩層: Agardhfjellet, Kcynia4
國家: 挪威, 波蘭4
化石紀錄: The Paleobiology Database 收錄 2 筆4
發現: Cryopterygius was named in 2012 by Patrick Druckenmiller, Jørn Hurum, Espen Knutsen and Hans Nakrem. The nearly complete skeleton was found on the north side of Janusfjellet, near Longyearbyen, Svalbard, Norway.1