恐龍卡第 0085 張，共 2 027 張

Amanasaurus

名字的意思： “rain lizard”1

吃：植物有喙的草食恐龍三疊紀晚期

Amanasaurus was a plant-eating dinosaur that lived about 233 million years ago in what is now Brazil. It had a beak-like mouth and walked on four legs, munching on ferns and other plants. This dinosaur was about the size of a large dog, making it one of the bigger plant-eaters of its time.2 6

生存年代

237 到 227 百萬年前6

三疊紀晚期

化石發現地

Pivetta site, between Restinga Sêca and São João do Polêsine, Rio Grande do Sul, Brazil2 6

長度

最多 1.27 m (4.2 ft)3

體重

最多 3.5 kg (8 lb)3

高度

0.42 m (1.4 ft)

估計值

最高速度

時速約 25 公里（16 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？

牠有多高？

估計值

牠有多重？

跟 29 根香蕉一樣重

跟 2.5 隻家貓從鼻子接到尾巴一樣長跟 7 根香蕉頭尾相接一樣長大約跟一隻家貓一樣重跟 29 根香蕉一樣重小到能從椅子底下走過去能在 14 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Amanasaurus 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)

Amanasaurus 時速約 25 公里 (16 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

Amanasaurus lived during a time called the Carnian pluvial episode, a wet period when it rained a lot. Its name 'rain lizard' comes from that.1 2

Scientists know Amanasaurus from just two leg bones: a top part of a right thigh bone and a bottom part of a left thigh bone. These bones were found in the same spot.2 1

Amanasaurus was about the same size as the earliest dinosaurs that lived alongside it. This surprised scientists, who thought silesaurids were always smaller.2

The thigh bone of Amanasaurus had a special groove called a cleft between the top of the anterior trochanter and the shaft. This is the oldest such feature seen in any silesaurid.2

Amanasaurus is named after Dr. Sterling J. Nesbitt, a paleontologist who studied many Triassic reptiles. The species name 'nesbitti' honors his work.1 2

Some scientists think Amanasaurus might be a very early type of ornithischian dinosaur, the group that includes plant-eaters like Stegosaurus and Triceratops. Others say it is a close cousin of dinosaurs.2 1

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

?How big was Amanasaurus?

About 1.3 metres (4.3 feet) long, based on the larger leg bone found. That is roughly the size of a large dog.4

?Was Amanasaurus a dinosaur?

Scientists disagree. Some say it was a very early ornithischian dinosaur, while others say it was a close cousin of dinosaurs. Either way, it is a dinosauriform, meaning it is closely related to dinosaurs.5 1

?What did Amanasaurus eat?

It was a plant-eater. It used its beak-like mouth to munch on ferns and other plants that grew during the rainy Carnian period.4

給恐龍專家

學名: Amanasaurus
命名者: Müller and Garcia 20236
類群: 有喙的草食恐龍
科 / 演化支: Silesauridae6
分類: Ornithischia6
岩石的年代: 237 到 227 百萬年 (Carnian)6
國家: 巴西6
化石紀錄: The Paleobiology Database 收錄 1 筆6
發現: Amanasaurus was named in 2023 by paleontologists Rodrigo T. Müller and Maurício S. Garcia. They studied two fossil leg bones found at the Pivetta site in Brazil.6 2
仍有爭議: Scientists are not sure if Amanasaurus was a true dinosaur or a very close relative. Some studies place it inside Ornithischia, while others put it just outside Dinosauria.2 1