恐龍卡第 0887 張，共 2 027 張

Isfjordosaurus

名字的意思： “Isfjord lizard, named after the Isfjord area in Svalbard where it was found”1

吃：肉魚龍類三疊紀早期到三疊紀中期嚴格來說不是恐龍

Isfjordosaurus was a small marine reptile that swam in the seas during the Early Triassic, about 248 million years ago. It looked a bit like a dolphin but was not a dinosaur. Its fossils were found on a cold Arctic island called Spitsbergen.1 3

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

249 到 247 百萬年前3

三疊紀早期到三疊紀中期

化石發現地

Fossils were found on Spitsbergen island in the Svalbard archipelago, Norway, near the Isfjord area.1 3

長度

0.6 m (2 ft)2

最高速度

時速約 13 公里（8 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 3 根香蕉頭尾相接一樣長能在 14 秒內游完一座大泳池（50 公尺）

Isfjordosaurus 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)

Isfjordosaurus 時速約 13 公里 (8 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

Isfjordosaurus is known from only a single upper arm bone, called a humerus, which makes it a mysterious animal.2

Some scientists are not sure if Isfjordosaurus was really an ichthyosaur, because the bone looks unusual.2

It lived during the Early Triassic, a time when ichthyosaurs were just starting to appear in the oceans.1

The name Isfjordosaurus comes from the Isfjord, a large fjord on Spitsbergen, where the fossil was found.1

The only known species is called Isfjordosaurus minor, and 'minor' means smaller, hinting it was a small reptile.1

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

迷思破解王

迷思： Some people think Isfjordosaurus was a dinosaur because it lived in the sea and had 'saurus' in its name.

真相： Isfjordosaurus was an ichthyosaur, a marine reptile, not a dinosaur. Dinosaurs lived on land.1

給恐龍專家

學名: Isfjordosaurus
命名者: Motani 19993
類群: 魚龍類
科 / 演化支: Ichthyosauria3
分類: Ichthyosauria > Ichthyosauromorpha3
岩石的年代: 249 到 247 百萬年 ()3
岩層: Vikinghøgda3
國家: 斯瓦巴3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: The fossil was first described by Carl Wiman in 1910, but the name Isfjordosaurus was given later by Ryosuke Motani in 1999.1 3
仍有爭議: Scientists still debate whether Isfjordosaurus was truly an ichthyosaur, because the only known bone is so unusual.2