恐龍卡第 1713 張，共 2 027 張

Stenopterygius

名字的意思： “narrow fin”1

吃：肉魚龍類侏羅紀早期到侏羅紀中期嚴格來說不是恐龍

Stenopterygius was a fast-swimming marine reptile that lived in the Jurassic seas. It looked a bit like a dolphin but was actually an ichthyosaur, not a dinosaur. It had a long beak full of teeth and chased after fish and squid.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

184 到 171 百萬年前3

侏羅紀早期到侏羅紀中期

化石發現地

Germany, England, France, Luxembourg and Switzerland1 3

長度

2 到 4 m (6.6 到 13 ft)1

最高速度

時速約 48 公里（30 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 4 隻狗從鼻子接到尾巴一樣長跟 22 根香蕉頭尾相接一樣長能在 3.8 秒內游完一座大泳池（50 公尺）

Stenopterygius 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)

Stenopterygius 時速約 48 公里 (30 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

Stenopterygius had a small skull and narrow flippers compared to its relative Ichthyosaurus.1

One well-preserved fossil shows traces of skin, revealing that Stenopterygius was countershaded: darker on the back and lighter on the belly.1

Fossils of Stenopterygius often contain the remains of its last meal in the stomach area.1

The tail ended in a large, semicircular, leathery vertical fin, and it also had a triangular dorsal fin on its back.1

Stenopterygius lived during the Early and Middle Jurassic, about 183 to 173 million years ago.1

The type specimen of Stenopterygius quadriscissus is a complete skeleton that even preserved a very large embryo inside.1

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

?How big was Stenopterygius?

Stenopterygius was a medium sized ichthyosaur, with most species reaching about 3.5 metres long, while the largest, S. uniter, could exceed 4 metres.1

?What did Stenopterygius eat?

Stenopterygius hunted fish, cephalopods, and other animals in the open sea. Fossils often contain the remains of its last meal in the stomach area.1

?Was Stenopterygius a dinosaur?

No, Stenopterygius was an ichthyosaur, a marine reptile, not a dinosaur. It looked a bit like a dolphin but was actually a different group of reptiles.1

?Did Stenopterygius give birth to live young?

Yes, Stenopterygius gave birth to live young, and one famous fossil shows a mother that died in childbirth. It preferred tail-first births, like modern dolphins and whales.1

給恐龍專家

學名: Stenopterygius
命名者: Jaekel 19043
類群: 魚龍類
科 / 演化支: Thunnosauria3
分類: Ichthyosauria > Ichthyosauromorpha3
岩石的年代: 184 到 171 百萬年 (Toarcian / Aalenian)3
岩層: Posidonia Shale, Opalinuston, Beacon Limstone3
國家: 德國, 英國, 盧森堡, 法國3
化石紀錄: The Paleobiology Database 收錄 47 筆3
發現: The species was first named as Ichthyosaurus quadriscissus by Quenstedt in 1856. Otto Jaekel gave it its own genus, Stenopterygius, in 1904.1
仍有爭議: Scientists are still debating exactly how many species of Stenopterygius existed, because the fossils are often incomplete.2