恐龍卡第 1177 張，共 2 027 張

Microcleidus

名字的意思： “small collarbone”5

吃：肉蛇頸龍類侏羅紀早期嚴格來說不是恐龍

Microcleidus was a long-necked marine reptile that swam in the warm Jurassic seas. It had a small head and a very long neck with 38 to 39 bones. It used its flippers to paddle through the water and catch fish.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

184 到 175 百萬年前5

侏羅紀早期

化石發現地

England, Germany, France, and Luxembourg5

長度

4.27 到 5.03 m (14 到 17 ft)1

體重

120 kg 到 650 kg (265 到 1,400 lb)3 4

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？

牠有多重？

跟 32 隻狗一樣重

跟 5 隻狗從鼻子接到尾巴一樣長跟 28 根香蕉頭尾相接一樣長跟 130 顆西瓜一樣重跟 34 個幼兒園小朋友一樣重跟 20 個小學生一樣重能在 6.2 秒內游完一座大泳池（50 公尺）

Microcleidus 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)

Microcleidus 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

Microcleidus had a small head only about 23 centimetres (9 inches) long, even though its body could reach over 5 metres.1

Its neck contained 38 to 39 vertebrae, making it a very long-necked plesiosaur.1

Scientists have named at least five species of Microcleidus, including M. homalospondylus and M. macropterus.1

One species, Microcleidus tournemirensis, was once thought to belong to a different genus called Occitanosaurus.5

Microcleidus lived during the Toarcian age of the Jurassic Period, about 184 to 175 million years ago.2

Its fossils have been found in the Alum Shale of England and the Posidonia Shale of Germany.5

The first Microcleidus fossils were originally described as Plesiosaurus homalospondylus by Richard Owen in 1865.1

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

?How big was Microcleidus?

The largest species, Microcleidus homalospondylus, measured about 5.1 metres (17 feet) long and weighed around 650 kilograms (1,430 pounds). Other species were smaller, like M. tournemirensis at about 4 metres (13 feet) and 300 kilograms (660 pounds).3

?What did Microcleidus eat?

Microcleidus was a carnivore that likely ate fish and other small sea creatures. It used its long neck and small head to snap up prey while swimming.5

?Where did Microcleidus live?

Microcleidus lived in the warm Jurassic seas, and its fossils have been found in England, Germany, France, and Luxembourg. It swam in shallow waters about 184 to 175 million years ago.3 5

給恐龍專家

學名: Microcleidus
命名者: Watson 19095
類群: 蛇頸龍類
科 / 演化支: Microcleididae5
分類: Plesiosauria > Sauropterygia5
岩石的年代: 184 到 175 百萬年 (Toarcian)5
岩層: Alum Shale, Posidonia Shale5
國家: 英國, 德國, 法國, 盧森堡5
化石紀錄: The Paleobiology Database 收錄 9 筆5
又名: Occitanosaurus （舊名稱現在也算作同一種動物）5
發現: The name Microcleidus was given by D. M. S. Watson in 1909 for fossils that had earlier been called Plesiosaurus. The first species, M. homalospondylus, was originally described by Richard Owen in 1865.5 1
仍有爭議: Scientists are not sure whether some species, like Hydrorion brachypterygius, should really be placed in Microcleidus.1