恐龍卡第 0328 張，共 2 027 張

Callawayasaurus

名字的意思： “Callaway's lizard”1

吃：肉蛇頸龍類白堊紀早期嚴格來說不是恐龍

Callawayasaurus was a long-necked marine reptile that swam in the seas of what is now Colombia. It was not a dinosaur, but a plesiosaur with a small head and a very long neck. It used its four flippers to paddle through the water.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

121 到 120 百萬年前4

白堊紀早期

化石發現地

Colombia (Boyacá)2

長度

7.4 到 8 m (24 到 26 ft)1

最高速度

時速約 24 公里（15 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 8 隻狗從鼻子接到尾巴一樣長跟 44 根香蕉頭尾相接一樣長能在 7.5 秒內游完一座大泳池（50 公尺）

Callawayasaurus 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)

Callawayasaurus 時速約 24 公里 (15 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

Callawayasaurus had a skull only 35 centimetres (1 foot 2 inches) long, but its whole body was about 7 to 8 metres (24 to 26 feet) long.1

Its neck contained 56 vertebrae, which is a lot, but they were shorter than the neck bones of other elasmosaurids.1

The nostrils of Callawayasaurus were long and positioned above the upper jaw bone, which had 3 to 5 teeth.1

It lived during the Early Cretaceous period, about 125 to 112 million years ago.1

The first fossils were found in the Paja Formation near Villa de Leyva, Colombia.1

A second, nearly complete skeleton was slightly more robust than the first, which might mean males and females looked a bit different.1

Callawayasaurus was named after paleontologist Jack M. Callaway, who studied ancient marine reptiles.1

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

?Was Callawayasaurus a dinosaur?

No, it was a plesiosaur, a marine reptile that lived in the sea. It is not a dinosaur.1

?How big was Callawayasaurus?

It was about 7.4 to 8 metres (24 to 26 feet) long. Its skull was 35 centimetres (14 inches) long.1

?What did Callawayasaurus eat?

It was a carnivore that lived in the sea. It probably opened its mouth and raked the seafloor to catch small animals.3 4

給恐龍專家

學名: Callawayasaurus
命名者: Carpenter 19994
類群: 蛇頸龍類
科 / 演化支: Elasmosauridae4
分類: Plesiosauria > Elasmosauridae > Sauropterygia4
岩石的年代: 121 到 120 百萬年 (Aptian)4
國家: 哥倫比亞4
化石紀錄: The Paleobiology Database 收錄 2 筆4
發現: The first fossil was described by Samuel Paul Welles in 1962, who called it Alzadasaurus colombiensis. In 1999, Kenneth Carpenter moved it to its own genus, Callawayasaurus.1
仍有爭議: Scientists are not sure if the slightly more robust skeleton is a different species or just a male or female of the same species.1