恐龍卡第 0438 張，共 2 027 張

Compressidens

名字的意思： “compressed teeth”1

吃：肉滄龍類白堊紀晚期嚴格來說不是恐龍

Compressidens was a small mosasaur, a marine lizard that lived in the sea during the time of the dinosaurs. It had special flat teeth for crushing hard-shelled animals like clams and sea urchins.1 2

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

72 到 66 百萬年前2

白堊紀晚期

化石發現地

Belgium, in the Craie de Ciply formation2

長度

2 到 2.6 m (6.6 到 8.5 ft)1

最高速度

時速約 30 公里（19 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

牠有多大？

牠有多長？

跟 2.5 隻狗從鼻子接到尾巴一樣長跟 14 根香蕉頭尾相接一樣長能在 6 秒內游完一座大泳池（50 公尺）

Compressidens 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)

Compressidens 時速約 30 公里 (19 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

Compressidens is now called Carinodens, because the name Compressidens was already used for a different animal, a type of mollusk.1

It was one of the smallest mosasaurs, only about 2 to 2.6 metres (6.6 to 8.5 feet) long.1

Its teeth were flat and compressed from side to side, which is why it was named Compressidens, meaning 'compressed teeth'.1

Only the back five teeth were used for crushing food; the front teeth were small and pointed for grabbing prey.1

Fossils of Compressidens have been found in Europe, North America, South America, and North Africa.1

Scientists think it may have lived in deep water most of the time, only rarely coming into shallow seas.1

Compressidens 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Compressidens 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。

給恐龍專家

學名: Compressidens
命名者: Dollo 19242
類群: 滄龍類
科 / 演化支: Mosasauridae2
分類: Mosasauroidea2
岩石的年代: 72 到 66 百萬年 (Maastrichtian)2
岩層: Craie de Ciply2
國家: 比利時2
化石紀錄: The Paleobiology Database 收錄 1 筆2
發現: The name Compressidens was given by Louis Dollo in 1924, but it was later changed to Carinodens in 1969 because the name was already taken.1 2
仍有爭議: Scientists are not sure what the upper jaw of Compressidens looked like, because no fossils of the upper jaw have been found.1