恐龍卡第 1386 張，共 2 027 張

Parrassaurus

名字的意思： “Parras lizard, after the Parras Basin in Mexico”3

吃：肉魚龍類侏羅紀晚期到白堊紀早期嚴格來說不是恐龍

Parrassaurus was a fast-swimming marine reptile that lived in the warm seas of Mexico during the Late Jurassic. It looked a bit like a dolphin but was actually an ichthyosaur, not a dinosaur. With its long snout and big eyes, it was a skilled hunter of fish and squid.1 2

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

145 到 143 百萬年前3

侏羅紀晚期到白堊紀早期

化石發現地

Coahuila, northern Mexico (La Caja Formation)1 2

長度

5 m (16 ft)2

最高速度

時速約 46 公里（29 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 5 隻狗從鼻子接到尾巴一樣長跟 28 根香蕉頭尾相接一樣長能在 3.9 秒內游完一座大泳池（50 公尺）

Parrassaurus 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)

Parrassaurus 時速約 46 公里 (29 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

Parrassaurus had an extremely long snout in front of its nostrils, which helped it snap up prey.1

Its skull had a unique feature: the opening for the nostril was split into two parts by a bone from the upper jaw.1

This ichthyosaur belonged to a group called ophthalmosaurids, which had very large eyes.2

Parrassaurus is only known from one nearly complete skeleton, found on a ranch in Coahuila.3 1

It lived about 145 million years ago, at the very end of the Jurassic Period.3

Parrassaurus was named in 2021, making it a relatively new discovery for scientists.3

Parrassaurus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Parrassaurus 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: Parrassaurus
命名者: Barrientos-Lara and Alvarado-Ortega 20213
類群: 魚龍類
科 / 演化支: Ophthalmosauridae3
分類: Ichthyosauria > Ichthyosauromorpha3
岩石的年代: 145 到 143 百萬年 (Tithonian)3
岩層: La Caja3
國家: 墨西哥3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Parrassaurus was named in 2021 by paleontologists Jair Israel Barrientos-Lara and Jesús Alvarado-Ortega based on a skeleton found in the La Caja Formation of Coahuila, Mexico.3 1
仍有爭議: Scientists are still debating how Parrassaurus is related to other ichthyosaurs, especially other platypterygiines from North America.1