恐龍卡第 0952 張，共 2 027 張

Keichousaurus

名字的意思： “Kweichow lizard”1

吃：魚海生爬蟲類三疊紀早期到三疊紀中期嚴格來說不是恐龍

Keichousaurus was a small marine reptile that swam in warm seas during the Triassic Period. It had a long neck, a long tail, and paddle-like limbs to row through the water.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

251 到 237 百萬年前5

三疊紀早期到三疊紀中期

化石發現地

Guizhou, Hubei, and Yunnan provinces, China1 2

長度

0.3 到 0.5 m (1 到 1.6 ft)1

最高速度

時速約 4 公里（2 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 根香蕉頭尾相接一樣長跟 16 塊積木排成一排一樣長能在 45 秒內游完一座大泳池（50 公尺）

Keichousaurus 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？

Keichousaurus 時速約 4 公里 (2 mph)

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)

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

Keichousaurus gave birth to live young instead of laying eggs. Baby fossils have been found inside adult females.1

This reptile had very broad ulna bones in its forelimbs, which helped make its paddles more effective for swimming.1

Males grew slightly larger than females. Mature males reached about 16 cm snout-vent length, while females reached about 15 cm.1

Keichousaurus is one of the most common sauropterygian fossils found in China. Many complete skeletons have been collected.1

It had a long, serpentine neck and a small head, similar to other pachypleurosaurs.1

Keichousaurus probably used a rowing motion with its paddle-like limbs to move through the water.1

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

?Is Keichousaurus a dinosaur?

No, Keichousaurus is not a dinosaur. It is a marine reptile called a sauropterygian.1

?How big was Keichousaurus?

Keichousaurus was very small. Mature males reached about 16 cm snout-vent length, and females about 15 cm.1

?What did Keichousaurus eat?

It ate fish. It had pointed teeth and backward-curved teeth at the front of its mouth to catch and swallow prey whole.1

?Did Keichousaurus lay eggs?

No. Fossil evidence shows that Keichousaurus gave birth to live young, not eggs. Babies have been found inside adult females.1 4 3

?Could Keichousaurus swim?

Yes, it was a good swimmer. It used its paddle-like limbs to row through the water, similar to underwater flight.1

?When did Keichousaurus live?

Keichousaurus lived during the Triassic Period, from about 251 to 227 million years ago.1

給恐龍專家

學名: Keichousaurus
命名者: Young 19585
類群: 海生爬蟲類
科 / 演化支: Keichousauridae5
分類: Sauropterygia5
岩石的年代: 251 到 237 百萬年 ()5
岩層: Falang, Jialingjiang, Gejiu5
國家: 中國5
化石紀錄: The Paleobiology Database 收錄 7 筆5
發現: The first fossil of Keichousaurus was found in 1957 in Guizhou Province, China, by Hu Chengzhi. It was named by Chinese paleontologist Young Chung-chien in 1958.1
仍有爭議: Scientists are not sure whether Keichousaurus was viviparous (giving birth to live young) or ovoviviparous (eggs hatching inside the mother).3