恐龍卡第 1565 張，共 2 027 張

Russellosaurus

名字的意思： “Russell's lizard, after paleontologist Dale Russell”1 2

吃：肉滄龍類白堊紀晚期嚴格來說不是恐龍

Russellosaurus was an ancient marine lizard that swam in the warm seas of Texas about 92 million years ago. It was a fast hunter with a long, slender skull and lots of sharp teeth. Even though it looked a bit like a dinosaur, it was actually a mosasaur, a relative of today's monitor lizards!1 4

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

94 到 90 百萬年前4

白堊紀晚期

化石發現地

Cedar Hill, Dallas County, Texas, USA4 1

長度

3 m (9.8 ft)3

體重

70 kg (154 lb)3

最高速度

時速約 35 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

牠有多大？

牠有多長？

牠有多重？

跟 4 隻狗一樣重

跟 3 隻狗從鼻子接到尾巴一樣長跟 17 根香蕉頭尾相接一樣長跟 14 顆西瓜一樣重跟 4 個幼兒園小朋友一樣重跟 2 個小學生一樣重能在 5.1 秒內游完一座大泳池（50 公尺）

Russellosaurus 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)

Russellosaurus 時速約 35 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

Russellosaurus is the oldest well-preserved mosasaur skull ever found in North America, at about 92 million years old.1 2

The only known fossil is a nearly complete skull, found in 1992 by a fossil hunter named Mark Cohen at a housing construction site.1 2

This mosasaur was small and lightly built, with a narrow skull and 16 teeth on each side of its upper and lower jaws.2

The skull bones were not fully fused together, and the bone surface had lots of blood vessels, showing the animal was still growing fast when it died.1 2

Russellosaurus is the name-giver for a whole group of mosasaurs called Russellosaurina, which includes the famous Tylosaurus and Plioplatecarpus.1 2

It lived alongside another early mosasaur called Dallasaurus, which still had legs and could probably walk on land.2

Russellosaurus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Russellosaurus 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: Russellosaurus
命名者: Polcyn and Bell 20054
類群: 滄龍類
科 / 演化支: Mosasauridae4
分類: Mosasauroidea4
岩石的年代: 94 到 90 百萬年 (Turonian)4
岩層: Arcadia Park Shale4
國家: 美國4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: Russellosaurus was named in 2005 by paleontologists Michael Polcyn and G.L. Bell. The skull was discovered in 1992 by Mark Cohen, a member of the Dallas Paleontological Society, at a housing construction site in Cedar Hill, Texas.1 2
仍有爭議: Scientists are not sure exactly how big Russellosaurus grew, because only its skull has been found and no body bones.2