恐龍卡第 1132 張，共 2 027 張

Manidens

名字的意思： “hand tooth”1

吃：植物有喙的草食恐龍侏羅紀早期到侏羅紀中期

Manidens was a tiny, plant-eating dinosaur that lived in what is now Argentina. It had a beak and special teeth that looked a bit like a human hand. This little dinosaur was only about as long as a big dog!1

生存年代

184 到 171 百萬年前3

侏羅紀早期到侏羅紀中期

化石發現地

Chubut Province, Argentina1

長度

0.6 到 0.75 m (2 到 2.5 ft)1

體重

0.5 kg (1 lb)2

高度

0.26 m (0.9 ft)

估計值

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？

牠有多高？

估計值

牠有多重？

跟 4 根香蕉一樣重

跟 4 根香蕉頭尾相接一樣長比一隻家貓還輕跟 4 根香蕉一樣重小到能從椅子底下走過去能在 24 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Manidens 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)

Manidens 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

Manidens lived during the Middle Jurassic, about 171 to 167 million years ago, in a time when South America had many lakes and forests.1

Its name comes from the Latin words for 'hand' and 'tooth' because its last tooth looked like a tiny hand with fingers.1

Manidens is a heterodontosaurid, a group of small ornithischian dinosaurs that often had different types of teeth for different jobs.1

The only known skeleton of Manidens includes parts of the skull, jaws, backbone, shoulder, and hips, but not the tail or legs.1

Scientists think Manidens shows an intermediate step in the evolution of plant-eating: it had high tooth crowns but not the heavy wear facets that later relatives had.1

Manidens was one of the few ornithischian dinosaurs known from the Jurassic of South America, making it a rare find.1

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

?How big was Manidens?

Manidens was about 60 cm (2.0 ft) long and weighed around 500 g (1.1 lb), smaller than later heterodontosaurids.2

?What did Manidens eat?

Manidens was a plant-eater. It had high-crowned teeth for chewing plants, but it lacked the heavy wear facets seen in more advanced relatives.2 1

?When did Manidens live?

Manidens lived during the Early Jurassic, about 179 to 178 million years ago, in what is now Argentina.2

?Did Manidens have feathers?

Scientists think it might have. A close relative called Tianyulong had filamentous structures, so Manidens may have had them too.2

給恐龍專家

學名: Manidens
命名者: Pol et al. 20113
類群: 有喙的草食恐龍
科 / 演化支: Heterodontosauridae3
分類: Ornithischia > Heterodontosauridae3
岩石的年代: 184 到 171 百萬年 (Toarcian / Aalenian)3
岩層: Cañadón Asfalto3
國家: 阿根廷3
化石紀錄: The Paleobiology Database 收錄 2 筆3
發現: Manidens was named in 2011 by Diego Pol, Oliver Rauhut, and Marcos Becerra. The fossils were found at the Queso Rallado site near Cerro Cóndor, Argentina, in the Cañadón Asfalto Formation.1 3
仍有爭議: Scientists are still debating exactly how Manidens chewed its food, since its teeth were high and close together but lacked the heavy wear seen in more advanced plant-eaters.1