恐龍卡第 1870 張，共 2 027 張

Utatsusaurus

名字的意思： “Utatsu lizard”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

Utatsusaurus was one of the very first ichthyosaurs, a marine reptile that lived in the ocean. It had a long, slender body and swam like an eel, wiggling its whole body. Unlike later ichthyosaurs, it had no dorsal fin on its back.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

252 到 247 百萬年前3

三疊紀早期到三疊紀中期

化石發現地

Japan (Miyagi Prefecture), Canada (British Columbia), and USA (Nevada)2 1

長度

2.5 到 3 m (8.2 到 9.8 ft)1

體重

57.8 kg (127 lb)1

最高速度

時速約 42 公里（26 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？

牠有多重？

跟 3 隻狗一樣重

跟 3 隻狗從鼻子接到尾巴一樣長跟 17 根香蕉頭尾相接一樣長跟 14 隻家貓一樣重跟 12 顆西瓜一樣重跟 3 個幼兒園小朋友一樣重跟 2 個小學生一樣重能在 4.3 秒內游完一座大泳池（50 公尺）

Utatsusaurus 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)

Utatsusaurus 時速約 42 公里 (26 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

Utatsusaurus lived about 248 to 245 million years ago, during the Early Triassic period.1

It had about 40 vertebrae in front of its hips, and its backbone was shaped like a cylinder, which helped it swim with an eel-like motion.1

Its flippers were small and had five fingers, with extra finger bones (a condition called hyperphalangy).1

The first fossil of Utatsusaurus was found in Utatsu-cho, a town in Miyagi Prefecture, Japan, and the dinosaur was named after that place.1

Utatsusaurus is one of the most primitive ichthyosaurs, meaning it had many features that later ichthyosaurs lost or changed.1

Scientists used computer imagery in 1998 to study the crushed fossils and found that Utatsusaurus is related to lizards, snakes, and crocodiles.1

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

?How big was Utatsusaurus?

Utatsusaurus was about 2.5 to 3 metres long (8.2 to 9.8 feet) and weighed around 57.8 kilograms (127 pounds).1

?What did Utatsusaurus eat?

Utatsusaurus ate fish. Its small, blunt teeth were good for catching and eating them.1

?Where was Utatsusaurus found?

The first fossil was found in Utatsu-cho, Japan (now part of Minamisanriku-cho). Fossils have also been found in British Columbia, Canada.1

?Is Utatsusaurus a dinosaur?

No, Utatsusaurus is not a dinosaur. It is an ichthyosaur, a marine reptile that lived in the ocean.1

給恐龍專家

學名: Utatsusaurus
命名者: Shikama and Kamei 19783
類群: 魚龍類
科 / 演化支: Utatsusauridae3
分類: Ichthyosauria > Ichthyosauromorpha3
岩石的年代: 252 到 247 百萬年 ()3
岩層: Sulphur Mountain, Osawa, Prida3
國家: 日本, 加拿大, 美國3
化石紀錄: The Paleobiology Database 收錄 5 筆3
發現: Utatsusaurus was named by Tokio Shikama and Tadao Kamei in 1978, based on a partial skeleton found in the Osawa Formation of Japan.3 1