恐龍卡第 0509 張，共 2 027 張

Diandongosaurus

名字的意思： “Diandong lizard, after the Diandong region of Yunnan, China”1

吃：肉海生爬蟲類三疊紀中期嚴格來說不是恐龍

Diandongosaurus was a small marine reptile that swam in the warm seas of China during the Triassic Period. It had a long body and sharp teeth for catching fish. It was only about as long as a ruler!1 2

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

244 到 243 百萬年前3

三疊紀中期

化石發現地

Luoping County, Yunnan Province, southwestern China1 3

長度

0.34 m (1.1 ft)1

最高速度

時速約 3 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 11 塊積木排成一排一樣長能在 60 秒內游完一座大泳池（50 公尺）

Diandongosaurus 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？

Diandongosaurus 時速約 3 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

Diandongosaurus had a snout that was not pinched, and the part of its skull in front of the eye was longer than the part behind the eye.2

Its skull had a small opening on top (the supratemporal fenestra) that was smaller than its eye socket.2

The bones that form the forehead (frontals) and the top of the skull (parietals) were fused together into single pieces.2

Its collar bone (clavicle) had a forward-pointing projection, which is unusual.2

The toe bones (ungual phalanxes) of its hind feet were extremely flattened from top to bottom, possibly helping it paddle.2

The only known complete skeleton of Diandongosaurus was found in a famous fossil site called the Guanling Formation, which preserves many Triassic sea creatures.1

Diandongosaurus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Diandongosaurus 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 might think Diandongosaurus was a dinosaur because it lived long ago and had a long tail.

真相： Diandongosaurus was not a dinosaur. It was a marine reptile called an eosauropterygian, a group that includes ancestors of plesiosaurs.1

給恐龍專家

學名: Diandongosaurus
命名者: Shang et al. 20113
類群: 海生爬蟲類
科 / 演化支: Eosauropterygia3
分類: Sauropterygia3
岩石的年代: 244 到 243 百萬年 ()3
岩層: Guanling3
國家: 中國3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Diandongosaurus was named in 2011 by Chinese paleontologists Qing-Hua Shang, Xiao-Chun Wu, and Chun Li. They described it from a complete, articulated skeleton found in the Guanling Formation of Yunnan Province.1 2
仍有爭議: Scientists are not sure exactly how Diandongosaurus is related to other marine reptiles. Some studies suggest it might be a close cousin of both nothosaurs and pachypleurosaurs, but its exact place in the family tree is still debated.2