恐龍卡第 0809 張，共 2 027 張

Himeoolithus

名字的意思： “small egg stone, from Japanese 'hime' meaning small or pretty, and Greek 'oo' and 'lithos' meaning egg stone”1

吃：肉肉食恐龍白堊紀早期

Himeoolithus was a tiny meat-eating dinosaur that lived in what is now Japan about 110 million years ago. It is known from its eggs, which are some of the smallest theropod eggs ever found, about the size of a quail egg. These eggs show that small dinosaurs lived alongside the giants!2

生存年代

113 到 110 百萬年前3

白堊紀早期

化石發現地

Kamitaki Egg Quarry, Hyogo Prefecture, Japan3 2

最高速度

時速約 47 公里（29 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)

Himeoolithus 時速約 47 公里 (29 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

Himeoolithus eggs are the smallest non-avian theropod eggs known, with an estimated mass of only 9.9 grams, about the size of a modern quail egg.1

The eggs are unusually elongated for their size, with a length-to-width ratio of 2.25, which is more typical of larger theropod eggs.1

The nest was found in place, not moved by water or wind, because most eggshell fragments were positioned concave-up, which happens when they break in place.2

Over 1,300 eggshell fragments from Himeoolithus were found at the Kamitaki Egg Quarry, along with other small theropod eggs.2

The high diversity of small theropod eggs at this site makes it one of the most diverse Early Cretaceous egg localities known.2

Himeoolithus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Himeoolithus 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 think all dinosaurs were huge, but Himeoolithus shows that many were small.

真相： Himeoolithus eggs are tiny, and the dinosaur that laid them was likely small, showing that dinosaurs came in many sizes.2

給恐龍專家

學名: Himeoolithus
命名者: Tanaka et al. 20203
類群: 肉食恐龍
科 / 演化支: Theropoda3
分類: Theropoda3
岩石的年代: 113 到 110 百萬年 (Albian)3
岩層: Ohyamashimo3
國家: 日本3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: The eggs were first discovered in 2015 at the Kamitaki Egg Quarry in Japan, and the species was named by Tanaka and colleagues in 2020.2 3
仍有爭議: Scientists are not sure exactly which theropod dinosaur laid the eggs, since no bones of the adult have been found yet.2