恐龍卡第 1462 張，共 2 027 張

Portunatasaurus

名字的意思： “Dugi Otok lizard”1

吃：肉滄龍類白堊紀晚期嚴格來說不是恐龍

Portunatasaurus was a small marine lizard that swam in warm seas during the time of the dinosaurs. It was only about 1 meter long, as long as a big skateboard, and had a long body and special flipper-like arms.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

100 到 90 百萬年前4

白堊紀晚期

化石發現地

Dugi Otok island, Croatia1 2

長度

1 m (3.3 ft)1

最高速度

時速約 12 公里（7 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 隻家貓從鼻子接到尾巴一樣長跟 6 根香蕉頭尾相接一樣長能在 15 秒內游完一座大泳池（50 公尺）

Portunatasaurus 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)

Portunatasaurus 時速約 12 公里 (7 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

Portunatasaurus had 10 small bones in its wrist, like land lizards, but also a flattened first finger bone like later sea lizards.2

Its arm was a mix between a walking leg and a swimming paddle, showing how lizards slowly turned into sea swimmers.2

The only skeleton found was almost complete from the neck to the hips, with a perfectly preserved right arm.2

It lived about 100 to 90 million years ago, during the Cenomanian and Turonian ages of the Late Cretaceous.3

Portunatasaurus is the third and youngest aigialosaur (a type of early marine lizard) found in Croatia.2

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

?Is Portunatasaurus a dinosaur?

No, it is a mosasauroid marine lizard, not a dinosaur.1

?How big was Portunatasaurus?

About 1 meter (3.3 feet) long, as long as a big skateboard.1

?What did Portunatasaurus eat?

Scientists do not know for sure, but its jaws were not found, so it is unknown what it ate.2

?Where was Portunatasaurus found?

It was found on the island of Dugi Otok in Croatia.1 4

給恐龍專家

學名: Portunatasaurus
命名者: Campbell Mekarski et al. 20194
類群: 滄龍類
科 / 演化支: Mosasauroidea4
分類: Mosasauroidea4
岩石的年代: 100 到 90 百萬年 (Cenomanian / Turonian)4
國家: 克羅埃西亞4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: The skeleton was found in 2008 on the island of Dugi Otok in Croatia. Scientists Michelle Mekarski, Dražen Japundžić, Katarina Krizmanić and Michael Caldwell named it Portunatasaurus krambergeri in 2019.1 2
仍有爭議: Scientists are still debating whether its paddle-like arm evolved earlier in mosasaur history or evolved more than once.2