恐龍卡第 1782 張，共 2 027 張

Thalassomedon

名字的意思： “sea lord”1

吃：肉蛇頸龍類白堊紀晚期嚴格來說不是恐龍

Thalassomedon was a huge marine reptile that swam in the seas of North America about 95 million years ago. It had an extremely long neck, over half its body length, and used its sharp teeth to catch fish and other prey.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

100 到 94 百萬年前3

白堊紀晚期

化石發現地

Colorado and Montana, USA3 1

長度

10.86 到 11.95 m (36 到 39 ft)1

體重

4.4 公噸到 6.8 公噸 (9,700 到 15,000 lb)1

最高速度

時速約 22 公里（14 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 5 台汽車一樣重

跟 2.5 台汽車排成一排一樣長跟 66 根香蕉頭尾相接一樣長大約跟一頭大象一樣重跟 1400 顆西瓜一樣重跟 8 整班小學生一樣重跟 15 隻北極熊一樣重能在 8.2 秒內游完一座大泳池（50 公尺）

Thalassomedon 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)

Thalassomedon 時速約 22 公里 (14 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

Thalassomedon's neck had 62 vertebrae and was about 5.9 metres (19 feet) long, more than half of its total body length.1

Its flippers were about 1.5 to 2 metres (4.9 to 6.6 feet) long, helping it steer through the water.1

Stones have been found in the stomach area of Thalassomedon, which scientists think may have helped grind food or acted as ballast for diving.1

Its skull was only 47 centimetres (19 inches) long, but its teeth were 5 centimetres (2 inches) long.1

Thalassomedon lived during the Cenomanian stage of the Late Cretaceous, about 95 million years ago.1

Its closest relative is Elasmosaurus, another long-necked plesiosaur.1

Six specimens of Thalassomedon are on display in museums across the United States.1

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

?How big was Thalassomedon?

Thalassomedon was about 10.86 to 11.95 metres (35.6 to 39.2 feet) long and weighed around 4.4 to 6.8 metric tons (4.9 to 7.5 short tons).1

?Was Thalassomedon a dinosaur?

No, Thalassomedon was a plesiosaur, which is a type of marine reptile that lived in the oceans, not a dinosaur.2

?What did Thalassomedon eat?

Thalassomedon used its sharp teeth to catch fish and other prey.1

?How long was Thalassomedon's neck?

Its neck was about 5.9 metres (19 feet) long and made up of 62 vertebrae, which is more than half of its total body length.1

?When did Thalassomedon live?

Thalassomedon lived about 95 million years ago during the Cenomanian stage of the Late Cretaceous.1

?Where was Thalassomedon found?

Fossils of Thalassomedon have been found in North America, specifically in the United States.1

給恐龍專家

學名: Thalassomedon
命名者: Welles 19433
類群: 蛇頸龍類
科 / 演化支: Elasmosauridae3
分類: Plesiosauria > Elasmosauridae > Sauropterygia3
岩石的年代: 100 到 94 百萬年 (Cenomanian)3
岩層: Graneros Shale, Belle Fourche3
國家: 美國3
化石紀錄: The Paleobiology Database 收錄 2 筆3
發現: Thalassomedon was named by S. P. Welles in 1943, based on fossils found in Colorado and Montana, USA.3 1
仍有爭議: Scientists are not sure whether the stones found in its stomach were used for grinding food or for ballast to help it dive.1