恐龍卡第 1345 張，共 2 027 張

Pahasapasaurus

名字的意思： “Black Hills lizard”1

吃：肉蛇頸龍類白堊紀晚期嚴格來說不是恐龍

Pahasapasaurus was a fast-swimming marine reptile that lived in the ancient seas of North America. It had a long snout and paddle-like flippers to chase 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

100 到 94 百萬年前3

白堊紀晚期

化石發現地

South Dakota, USA, and Utah, USA1 2

長度

6 m (20 ft)2

最高速度

時速約 27 公里（17 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 33 根香蕉頭尾相接一樣長能在 6.7 秒內游完一座大泳池（50 公尺）

Pahasapasaurus 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)

Pahasapasaurus 時速約 27 公里 (17 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

Pahasapasaurus was a plesiosaur, not a dinosaur. It was a marine reptile that lived in the ocean.1

Its name comes from the Lakota words 'Paha Sapa', meaning 'Black Hills', where the first fossil was found.1

The first specimen was discovered in 1934 by Charles Haas and his son Arthur while they were looking for shark teeth.1

Pahasapasaurus had a long snout and a mouth full of many similar teeth, perfect for grabbing slippery fish.2

Its flippers were long and paddle-shaped, and the bones in the lower part of the flipper were longer than wide, which helped it swim fast.1

The fossil was once covered in shellac and sugar sacks, and scientists had to carefully clean it to study the bones.1

A second species of Pahasapasaurus was named in 2025 from a complete skull found in Utah.1

Pahasapasaurus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Pahasapasaurus 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: Pahasapasaurus
命名者: Schumacher 20073
類群: 蛇頸龍類
科 / 演化支: Polycotylidae3
分類: Plesiosauria > Sauropterygia3
岩石的年代: 100 到 94 百萬年 (Cenomanian)3
岩層: Greenhorn Limestone3
國家: 美國3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Pahasapasaurus was named by Bruce Schumacher in 2007. The first fossil was found in 1934 by Charles Haas and his son Arthur in South Dakota, but it took many years before scientists realized it was a new species.1
仍有爭議: Scientists are still debating exactly how fast Pahasapasaurus could swim and whether it hunted alone or in groups.1