恐龍卡第 0776 張，共 2 027 張

Halisaurus

名字的意思： “sea lizard”1

吃：肉滄龍類白堊紀晚期到新生代，哺乳動物時代嚴格來說不是恐龍

Halisaurus was a small, sleek marine lizard that swam in the warm seas of the Late Cretaceous. It was not a dinosaur, but a mosasaur, a relative of today's monitor lizards. It used its long tail and flippers to chase fish and other prey.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

86 到 62 百萬年前2

白堊紀晚期到新生代，哺乳動物時代

化石發現地

North America (USA: New Jersey, Maryland, Delaware, California, North Carolina, Georgia), Africa (Morocco, Angola, Egypt, Niger, Congo-Kinshasa), South America (Peru, Chile, Argentina), Middle East (Jordan)2 1

長度

3 到 4 m (9.8 到 13 ft)1

最高速度

時速約 37 公里（23 英里）

游泳, 估計值

牠生活在什麼時候？

恐龍出現之前

恐龍時代

哺乳動物時代

4 億年前25266現在

牠有多大？

牠有多長？

跟 4 隻狗從鼻子接到尾巴一樣長跟 22 根香蕉頭尾相接一樣長能在 4.9 秒內游完一座大泳池（50 公尺）

Halisaurus 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)

Halisaurus 時速約 37 公里 (23 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

Halisaurus was named by famous fossil hunter Othniel Charles Marsh in 1869.1

It was a small mosasaur, only about 3 to 4 metres long, much smaller than giants like Tylosaurus.1

Its flippers were not as specialized as those of later mosasaurs, so it was probably a slower swimmer.1

Fossils of Halisaurus have been found on every continent except Australia and Antarctica.2

The species Halisaurus onchognathus is known only from remains that were destroyed during World War II, so scientists are not sure if it was a real species.1

Halisaurus lived from about 85 to 66 million years ago, during the Late Cretaceous.2

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

?How big was Halisaurus?

Halisaurus was about 3 to 4 metres (9.8 to 13.1 feet) long, making it small for a mosasaur.1

?Was Halisaurus a dinosaur?

No, Halisaurus was not a dinosaur. It was a mosasaur, a marine lizard related to today's monitor lizards.1

?What did Halisaurus eat?

Halisaurus likely ate small fish and other small prey, based on its slender jaws and numerous small teeth.1

?Could Halisaurus swim fast?

Maybe up to about 37 km/h (23 mph) in a short burst. This is an estimate from its size. But it was probably not a great swimmer over long distances, because its flippers were not as good as those of later mosasaurs.1

?When did Halisaurus live?

Halisaurus lived during the Late Cretaceous, from about 86 to 66 million years ago.1

?Where have Halisaurus fossils been found?

Fossils have been found on every continent except Australia and Antarctica, including North America and North Africa.1

迷思破解王

迷思： Halisaurus was a dinosaur.

真相： Halisaurus was a mosasaur, a marine reptile closely related to modern monitor lizards, not a dinosaur.1

給恐龍專家

學名: Halisaurus
命名者: Marsh 18692
類群: 滄龍類
科 / 演化支: Mosasauridae2
分類: Mosasauroidea2
岩石的年代: 86 到 62 百萬年 (Santonian / Danian)2
岩層: Navesink, Severn, Marshalltown2
國家: 美國, 摩洛哥, 智利, 秘魯, 約旦, 安哥拉2
化石紀錄: The Paleobiology Database 收錄 30 筆2
發現: Halisaurus was named by Othniel Charles Marsh in 1869 based on a partial skull and vertebrae found near Hornerstown, New Jersey.1
仍有爭議: Scientists are not sure how many species of Halisaurus really existed, because some fossils are very fragmentary.1