恐龍卡第 1025 張，共 2 027 張

Leiodon

名字的意思： “smooth tooth”1

吃：肉滄龍類白堊紀晚期嚴格來說不是恐龍

Leiodon was a giant marine lizard that swam in the warm seas of the Late Cretaceous. It had smooth, curved teeth perfect for grabbing slippery fish and other sea creatures.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

100 到 66 百萬年前3

白堊紀晚期

化石發現地

England, and also Antarctica, Brazil, France, Germany, Jordan, Morocco, Poland, Sweden, Syria, and Ukraine1 3

最高速度

時速約 36 公里（22 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)

Leiodon 時速約 36 公里 (22 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

Leiodon was first named by the famous scientist Richard Owen in 1841, based on just two tooth fragments and a bit of jawbone.1

The name Leiodon means 'smooth tooth' because the fossil teeth had a smooth and polished surface.1

Leiodon lived between about 100 and 66 million years ago, during the Late Cretaceous period.3

Leiodon fossils have been found all over the world, including in Antarctica, Europe, Africa, and South America.3

Some scientists think Leiodon might not be a valid genus because its main fossil teeth are now lost, making it a 'nomen dubium' or doubtful name.1

Leiodon was one of the original genera used to define the family Mosasauridae in 1853.1

Leiodon 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Leiodon 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： Leiodon was a dinosaur.

真相： Leiodon was not a dinosaur. It was a mosasaur, a type of giant marine lizard that lived in the ocean.1

給恐龍專家

學名: Leiodon
命名者: Owen 18423
類群: 滄龍類
科 / 演化支: Mosasauridae3
分類: Mosasauroidea3
岩石的年代: 100 到 66 百萬年 (Cenomanian / Maastrichtian)3
岩層: López de Bertodano, Gramame, Opoka3
國家: 敘利亞, 南極洲, 巴西, 瑞典, 波蘭, 德國3
化石紀錄: The Paleobiology Database 收錄 18 筆3
發現: Richard Owen named Leiodon in 1841 from two tooth fragments and a small jaw piece found in Essex, England.1
仍有爭議: Scientists are not sure if Leiodon is a valid genus because the original tooth fossils are missing, so it might be a 'nomen dubium' (doubtful name).1