恐龍卡第 0564 張，共 2 027 張

Edgarosaurus

名字的意思： “Edgar's lizard”3

吃：肉蛇頸龍類白堊紀早期到白堊紀晚期嚴格來說不是恐龍

Edgarosaurus was a short-necked plesiosaur that swam in the warm, shallow sea that once covered Montana. It used its long snout and sharp teeth to catch fish and other slippery 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

106 到 94 百萬年前3

白堊紀早期到白堊紀晚期

化石發現地

Montana, USA3

長度

3.5 m (11 ft)2

最高速度

時速約 29 公里（18 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 19 根香蕉頭尾相接一樣長能在 6.2 秒內游完一座大泳池（50 公尺）

Edgarosaurus 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)

Edgarosaurus 時速約 29 公里 (18 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

Edgarosaurus had a short neck and a long snout, unlike the long-necked plesiosaurs like Elasmosaurus.1

Its skull is one of the oldest and best-preserved plesiosaur skulls from the Cretaceous of North America.1

Edgarosaurus had 26 neck bones, which is more than some other short-necked plesiosaurs like Dolichorhynchops (which had 19).2

It had a small opening in the top of its skull called a pineal foramen, which some other plesiosaurs lacked.2

The only known fossil of Edgarosaurus was found in the Thermopolis Shale, which was once the bottom of the Western Interior Seaway.1

Edgarosaurus lived about 106 to 94 million years ago, during the Late Cretaceous period.2

Edgarosaurus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Edgarosaurus 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: Edgarosaurus
命名者: Druckenmiller 20023
類群: 蛇頸龍類
科 / 演化支: Polycotylidae3
分類: Plesiosauria > Sauropterygia3
岩石的年代: 106 到 94 百萬年 (Albian / Cenomanian)3
岩層: Thermopolis Shale3
國家: 美國3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Edgarosaurus was named by Pat S. Druckenmiller in 2002, based on a partial skeleton found in Montana. The type specimen includes a complete skull, many vertebrae, and a forelimb.1 3
仍有爭議: Scientists are not sure exactly how Edgarosaurus is related to other plesiosaurs. Some place it in the group Polycotylidae, but its exact family tree is still debated.1