恐龍卡第 0305 張，共 2 027 張

Brevicaudosaurus

名字的意思： “short-tailed lizard”1

吃：肉海生爬蟲類三疊紀中期到三疊紀晚期嚴格來說不是恐龍

Brevicaudosaurus was a small marine reptile that lived in the sea during the Triassic Period. It had a very short, flat tail and a broad, flat body, so it probably swam slowly and hunted near the seafloor.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

241 到 227 百萬年前3

三疊紀中期到三疊紀晚期

化石發現地

Fuyuan, Yunnan Province, China1 3

長度

0.588 m (1.9 ft)1

最高速度

時速約 5 公里（3 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 18 塊積木排成一排一樣長能在 36 秒內游完一座大泳池（50 公尺）

Brevicaudosaurus 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)

Brevicaudosaurus 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

Brevicaudosaurus means 'short-tailed lizard' because its tail was unusually short and flattened compared to other marine reptiles like it.1

A baby Brevicaudosaurus was only about one-third the length of an adult, and its teeth were small and smooth instead of fang-like.1 2

Adult Brevicaudosaurus had fang-shaped teeth in the front of the upper jaw, which helped them grab big prey.1 2

Scientists think Brevicaudosaurus lived on the seafloor and ate animals that lived there, because its flat body and short tail made it a slow swimmer.1

The first Brevicaudosaurus fossil was described in 2020, and a baby skeleton was found later in 2025.1 2

Brevicaudosaurus lived about 240 million years ago, during the Middle Triassic, in the ocean that covered what is now southern China.1 3

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

給恐龍專家

學名: Brevicaudosaurus
命名者: Shang et al. 20203
類群: 海生爬蟲類
科 / 演化支: Nothosauridae3
分類: Sauropterygia3
岩石的年代: 241 到 227 百萬年 (Ladinian / Carnian)3
國家: 中國3
化石紀錄: The Paleobiology Database 收錄 2 筆3
發現: Brevicaudosaurus was named in 2020 by scientists Shang, Wu, and Li based on a fossil found in Fuyuan, Yunnan Province, China.1 3
仍有爭議: Scientists are not sure exactly where Brevicaudosaurus fits on the family tree of marine reptiles. Some studies place it close to nothosaurs, while others put it outside that group.1