恐龍卡第 1486 張，共 2 027 張

Protognathosaurus

名字的意思： “early jaw lizard”1

吃：植物長脖子恐龍侏羅紀中期到侏羅紀晚期

Protognathosaurus was a long-necked, plant-eating dinosaur that lived in what is now China during the Middle Jurassic. It is known only from a piece of its lower jaw, so scientists are still learning about it. Most researchers think it was a medium-sized sauropod.1 3

生存年代

171 到 155 百萬年前3

侏羅紀中期到侏羅紀晚期

化石發現地

Dashanpu Dinosaur Quarry, Sichuan, China3 1

長度

10 到 100 m (33 到 328 ft)2

最高速度

時速約 15 公里（9 英里）

跑步, 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 22 台汽車排成一排一樣長跟 560 根香蕉頭尾相接一樣長能在 24 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Protognathosaurus 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)

Protognathosaurus 時速約 15 公里 (9 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

Protognathosaurus is known only from a single fossil: the front part of a left lower jaw, called a dentary.1

This dinosaur had 18 to 20 teeth in its lower jaw, and some of them were sharp replacement teeth still growing in.1 2

Its teeth had a sharp point and small serrations (like a steak knife) on the front and back edges.2

The name Protognathosaurus was first used in 1991 by George Olshevsky, because the original name Protognathus was already taken by a beetle.1

Most scientists consider Protognathosaurus a nomen dubium, meaning the fossil is too incomplete to be sure it is a distinct species.1

The jaw bone is thick and heavy, with a deep groove called the Meckelian canal, which is a feature of some early sauropods.2

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

?How big was Protognathosaurus?

Scientists don't know exactly, because only a jaw bone has been found. It was probably a medium-sized sauropod, maybe 10 to 20 metres long.1 3

?What did Protognathosaurus eat?

It was a herbivore, meaning it ate plants. Its sharp, serrated teeth helped it chew tough leaves.1 3

給恐龍專家

學名: Protognathosaurus
命名者: Olshevsky 19913
類群: 長脖子恐龍
科 / 演化支: Cetiosauridae3
分類: Sauropodomorpha > Sauropoda3
岩石的年代: 171 到 155 百萬年 (Bajocian / Oxfordian)3
岩層: Shaximiao3
國家: 中國3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: The fossil was found in the Dashanpu Dinosaur Quarry in Sichuan, China. It was named Protognathus oxyodon by Zhang Yihun in 1988, but that name was already used for a beetle, so George Olshevsky renamed it Protognathosaurus oxyodon in 1991.1
仍有爭議: Scientists are not sure if Protognathosaurus is a valid dinosaur or just a doubtful name, because only a piece of jaw has been found.1