恐龍卡第 1780 張，共 2 027 張

Thalassiodracon

名字的意思： “sea dragon”1

吃：肉蛇頸龍類侏羅紀早期嚴格來說不是恐龍

Thalassiodracon was a small, fast-swimming marine reptile that lived in the seas around what is now England. It had a short neck, big eyes, and long teeth, and it hunted fish and squid-like animals.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

201 到 184 百萬年前2

侏羅紀早期

化石發現地

Somerset, England, United Kingdom1

長度

1.5 m (4.9 ft)1

最高速度

時速約 18 公里（11 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 3 隻家貓從鼻子接到尾巴一樣長跟 8 根香蕉頭尾相接一樣長能在 10 秒內游完一座大泳池（50 公尺）

Thalassiodracon 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)

Thalassiodracon 時速約 18 公里 (11 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

Thalassiodracon had a skull only 17 cm (6.7 in) long, but its neck was 75.5 cm (2 ft 5.7 in) long.1

Its eyes were large and had flat scleral rings, which helped it see in dark, deep water.1

Thalassiodracon was warm-blooded, like modern mammals, and had a high metabolism for an active lifestyle.1

It gave birth to live young, not eggs, just like many modern sharks and some reptiles.1

The teeth of Thalassiodracon were constantly replaced in a wave pattern, with every third tooth being replaced at a time.1

Its forelimbs were shorter than its hindlimbs, which scientists think helped it chase prey with speed and strength.1

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

?How big was Thalassiodracon?

About 1.5 metres (4.9 ft) long. That is roughly the length of a small dolphin.1

?When did Thalassiodracon live?

It lived during the Late Triassic and Early Jurassic periods, about 201 to 196 million years ago.1

?Is Thalassiodracon a dinosaur?

No, it is a plesiosaur, which is a marine reptile. It lived in the sea and was not a dinosaur.1

迷思破解王

迷思： Thalassiodracon was a dinosaur.

真相： Thalassiodracon was a plesiosaur, a marine reptile that lived in the sea, not a dinosaur.1

給恐龍專家

學名: Thalassiodracon
命名者: Storrs and Taylor 19962
類群: 蛇頸龍類
科 / 演化支: Pliosauridae2
分類: Plesiosauria > Pliosauridae > Sauropterygia2
岩石的年代: 201 到 184 百萬年 (Hettangian / Pliensbachian)2
岩層: Blue Lias, White Lias2
國家: 英國2
化石紀錄: The Paleobiology Database 收錄 8 筆2
發現: The first fossils were found by Thomas Hawkins in Somerset, England in the early 1830s. Richard Owen named it Plesiosaurus hawkinsii in 1838, and it was given its own genus Thalassiodracon by Storrs and Taylor in 1996.1
仍有爭議: Scientists are still debating whether Thalassiodracon was an ancestor of the short-necked pliosaurs or a more primitive plesiosaur.1