恐龍卡第 1452 張，共 2 027 張

Plesiotylosaurus

名字的意思： “near Tylosaurus”1

吃：肉滄龍類白堊紀晚期嚴格來說不是恐龍

Plesiotylosaurus was a giant marine lizard that swam in the warm seas of the Late Cretaceous. It was not a dinosaur, but a fierce predator with a long, powerful body and a skull full of sharp teeth.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

72 到 66 百萬年前3

白堊紀晚期

化石發現地

Moreno Formation in California, USA1 3

長度

6 m (20 ft)1

最高速度

時速約 38 公里（24 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 6 隻狗從鼻子接到尾巴一樣長跟 33 根香蕉頭尾相接一樣長能在 4.7 秒內游完一座大泳池（50 公尺）

Plesiotylosaurus 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)

Plesiotylosaurus 時速約 38 公里 (24 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

Plesiotylosaurus had a bony rostrum (a kind of snout tip) that stuck out in front of its teeth, which is unusual among mosasaurs.1

Its lower jaw alone was nearly 1 meter (3.2 feet) long, about the height of a 3-year-old child.1

Plesiotylosaurus had teeth on the roof of its mouth (pterygoid teeth) that were almost as big as its regular teeth.1

Even though its name means 'near Tylosaurus', Plesiotylosaurus is not closely related to Tylosaurus. They just evolved similar skull features separately.1

The holotype skull of Plesiotylosaurus was found in the Panoche Hills of California, and it is a bit squashed but still mostly complete.1

Plesiotylosaurus lived about 70 to 66 million years ago, right at the end of the Age of Dinosaurs.1

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

?How big was Plesiotylosaurus?

About 6 metres (20 feet) long, based on its 98 cm (3.22 feet) lower jaw. Some estimates suggest around 6.5 metres.1 2

?What did Plesiotylosaurus eat?

It was a carnivore and probably ate tough prey like marine turtles, which are found in the same rocks. Its robust skull and strong jaws suggest it could handle hard-shelled animals.1 2

?Was Plesiotylosaurus a dinosaur?

No, it was a marine lizard belonging to the mosasaur family, not a dinosaur. It swam in the sea during the Late Cretaceous.1

給恐龍專家

學名: Plesiotylosaurus
命名者: Camp 19423
類群: 滄龍類
科 / 演化支: Mosasauridae3
分類: Mosasauroidea3
岩石的年代: 72 到 66 百萬年 (Maastrichtian)3
岩層: Moreno3
國家: 美國3
化石紀錄: The Paleobiology Database 收錄 2 筆3
發現: Plesiotylosaurus was named by C. L. Camp in 1942 based on a skull and jaws found in the Moreno Formation of California.1 3
仍有爭議: Scientists still debate whether Plesiotylosaurus should be considered a separate genus or if it is actually a species of Prognathodon, because their skulls are so similar.1