恐龍卡第 1828 張，共 2 027 張

Tricleidus

名字的意思： “three keyed (or three locked) lizard”1

吃：肉蛇頸龍類侏羅紀早期到侏羅紀晚期嚴格來說不是恐龍

Tricleidus was a plesiosaur, a marine reptile that swam in the seas during the Jurassic Period. It had a small head, a long neck, and flippers to paddle through the water. It was not a dinosaur, but a distant cousin that lived in the ocean.1 3

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

184 到 155 百萬年前3

侏羅紀早期到侏羅紀晚期

化石發現地

Fossils have been found in the United Kingdom and Norway.3 1

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)

Tricleidus 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

Tricleidus is known from only one skeleton, found in the Oxford Clay of England.1

The first fossil was a shoulder girdle, which is part of the skeleton that supports the flippers.2

It lived about 165 to 161 million years ago, during the Callovian age of the Jurassic.2

One species that was once called Tricleidus svalbardensis was moved to another genus, Colymbosaurus, in 2012.1

Tricleidus belongs to a group called Cryptoclididae, which were plesiosaurs with long necks and small heads.1 3

The type specimen is stored in a museum and is called BMNH R3539.1 2

Tricleidus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Tricleidus 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。

迷思破解王

迷思： Some people think Tricleidus was a dinosaur because it lived long ago and is often shown in dinosaur books.

真相： Tricleidus was a plesiosaur, a marine reptile, not a dinosaur. Dinosaurs lived on land and had different body features.1

給恐龍專家

學名: Tricleidus
命名者: Andrews 19093
類群: 蛇頸龍類
科 / 演化支: Cryptoclididae3
分類: Plesiosauria > Sauropterygia3
岩石的年代: 184 到 155 百萬年 (Toarcian / Oxfordian)3
岩層: Oxford Clay3
國家: 英國, 挪威3
化石紀錄: The Paleobiology Database 收錄 3 筆3
發現: Tricleidus was named by C. W. Andrews in 1909, based on a skeleton found in the Oxford Clay of Peterborough, England. The type species is Tricleidus seeleyi.1 3
仍有爭議: Scientists are still debating how Tricleidus is related to other plesiosaurs, and some fossils from Norway were once assigned to it but later moved to another genus.1