恐龍卡第 1363 張，共 2 027 張

Pantosaurus

名字的意思： “all lizard”1

吃：肉蛇頸龍類侏羅紀晚期嚴格來說不是恐龍

Pantosaurus was a long-necked marine reptile that swam in a shallow sea that once covered part of North America. It was not a dinosaur, but a plesiosaur, a type of ocean predator. It used its four flippers to glide through the water and catch fish and other prey.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

162 到 155 百萬年前4

侏羅紀晚期

化石發現地

Wyoming, USA, in the Sundance Formation1 3

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)

Pantosaurus 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

Pantosaurus had a very long neck with between 35 and 40 neck bones, called cervical vertebrae. These bones were almost as long as they were wide, which helped make the neck flexible.3

The name Pantosaurus was originally 'Parasaurus', but that name was already used for another animal, so scientists changed it.1

Pantosaurus lived in the Sundance Sea, a shallow ocean that covered parts of Wyoming millions of years ago.1

Scientists think Pantosaurus might have given birth to live young, not laid eggs, because it lived in the water.2

The front flippers of Pantosaurus were special: the radius bone was much longer and broader than the ulna, which helped it steer in the water.3

A fossil of a baby ichthyosaur (a different marine reptile) was found inside a Pantosaurus stomach, showing it ate other marine reptiles.1

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

?What did Pantosaurus eat?

Pantosaurus ate fish and other marine reptiles. A fossil of a baby ichthyosaur was found inside a Pantosaurus stomach, showing it ate ichthyosaurs.1 3

?How big was Pantosaurus?

Pantosaurus was a small plesiosaur, but its exact size is not known from the sources. It had a very long neck with 35 to 40 neck bones.1 3

?When did Pantosaurus live?

Pantosaurus lived during the Late Jurassic period, about 163 to 157 million years ago.1 4

?Was Pantosaurus a dinosaur?

No, Pantosaurus was not a dinosaur. It was a plesiosaur, a type of marine reptile that lived in the ocean.1

迷思破解王

迷思： Some people think Pantosaurus was a dinosaur because it lived in the same time as dinosaurs.

真相： Pantosaurus was a plesiosaur, a marine reptile, not a dinosaur. Dinosaurs lived on land, while Pantosaurus swam in the sea.1

給恐龍專家

學名: Pantosaurus
命名者: Marsh 18934
類群: 蛇頸龍類
科 / 演化支: Cryptoclididae4
分類: Plesiosauria > Sauropterygia4
岩石的年代: 162 到 155 百萬年 (Oxfordian)4
岩層: Sundance4
國家: 美國4
化石紀錄: The Paleobiology Database 收錄 6 筆4
又名: Parasaurus （舊名稱現在也算作同一種動物）4
發現: Pantosaurus was first found in Wyoming in the late 1800s by Othniel Charles Marsh. He named it Parasaurus in 1891, but changed the name to Pantosaurus in 1893 because the old name was already taken.1 3
仍有爭議: Scientists still debate whether some fossils belong to Pantosaurus or to another similar plesiosaur, because the skull is not known.3