恐龍卡第 1549 張，共 2 027 張

Rhomaleosaurus

名字的意思： “strong lizard”1

吃：肉蛇頸龍類侏羅紀早期嚴格來說不是恐龍

Rhomaleosaurus was a giant marine reptile that swam in the seas during the Early Jurassic period, about 183 to 175 million years ago. It was one of the biggest predators in the ocean at that time, with a huge head and a long neck, and it ate other sea creatures like ichthyosaurs and ammonites.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

201 到 175 百萬年前5

侏羅紀早期

化石發現地

Northamptonshire and Yorkshire, United Kingdom1

長度

7 m (23 ft)1 2

最高速度

時速約 26 公里（16 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 7 隻狗從鼻子接到尾巴一樣長跟 39 根香蕉頭尾相接一樣長能在 6.9 秒內游完一座大泳池（50 公尺）

Rhomaleosaurus 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)

Rhomaleosaurus 時速約 26 公里 (16 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

Rhomaleosaurus had a very long neck compared to other pliosaurs, but still had a gigantic head, making it a mix of features from both long-necked and short-necked plesiosaurs.2

The first fossil of Rhomaleosaurus was found in 1848 in an alum quarry at Kettleness, near Whitby, England, and was kept at Mulgrave Castle for five years before being sent to Dublin.1

The skull of the holotype specimen is 88 centimeters long, and the whole animal was about 7 meters (23 feet) long.2

Rhomaleosaurus lived at the same time as the large ichthyosaur Temnodontosaurus, and both were top predators in the same ocean.1

Scientists think Rhomaleosaurus could pick up scents while underwater, helping it find prey.1

The name Rhomaleosaurus was given by Harry Seeley in 1874, based on a fossil that was originally thought to be a species of Plesiosaurus.1 5

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

?How big was Rhomaleosaurus?

About 7 metres (23 feet) long.1 3

?What did Rhomaleosaurus eat?

It ate ichthyosaurs, ammonites, other plesiosaurs, belemnites, and fish.1 4

?Was Rhomaleosaurus a dinosaur?

No, it was a marine reptile called a plesiosaur, not a dinosaur.1 4

?When did Rhomaleosaurus live?

It lived during the Early Jurassic period, about 183 to 175 million years ago.1

?Where was Rhomaleosaurus found?

Fossils have been found in Northamptonshire and Yorkshire, England, in the Whitby Mudstone Formation.1 4

給恐龍專家

學名: Rhomaleosaurus
命名者: Seeley 18745
類群: 蛇頸龍類
科 / 演化支: Rhomaleosauridae5
分類: Plesiosauria > Sauropterygia5
岩石的年代: 201 到 175 百萬年 (Hettangian / Toarcian)5
岩層: Whitby Mudstone, Alum Shale, Blue Lias5
國家: 英國5
化石紀錄: The Paleobiology Database 收錄 15 筆5
發現: The first Rhomaleosaurus fossil was discovered in 1848 in an alum quarry at Kettleness, near Whitby, England. It was named Plesiosaurus cramptoni by Alexander Carte and W. H. Bailey in 1863, and later Harry Seeley placed it in its own genus, Rhomaleosaurus, in 1874.1
仍有爭議: Scientists still debate which species belong to Rhomaleosaurus. Some species once placed here, like Rhomaleosaurus megacephalus, are now thought to belong to other genera.1