恐龍卡第 1615 張，共 2 027 張

Seeleyosaurus

名字的意思： “Seeley's lizard”3

吃：肉蛇頸龍類侏羅紀早期嚴格來說不是恐龍

Seeleyosaurus was a plesiosaur, a long-necked marine reptile that swam in the Jurassic seas. It had four flippers like paddles and a mouth full of sharp teeth for catching fish. This reptile lived about 183 million years ago in the warm waters of what is now Germany.3 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

184 到 183 百萬年前3

侏羅紀早期

化石發現地

Holzmaden, Baden-Württemberg, Germany1

長度

最多 3.5 m (11 ft)1

體重

199 kg (439 lb)2

最高速度

時速約 29 公里（18 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？

牠有多重？

跟 10 隻狗一樣重

跟 4 隻狗從鼻子接到尾巴一樣長跟 19 根香蕉頭尾相接一樣長跟 40 顆西瓜一樣重跟 10 個幼兒園小朋友一樣重跟 6 個小學生一樣重能在 6.2 秒內游完一座大泳池（50 公尺）

Seeleyosaurus 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)

Seeleyosaurus 時速約 29 公里 (18 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

Seeleyosaurus had a skull about 17 centimeters (6.7 inches) long, with five teeth in the upper jaw and up to 20 teeth in the lower jaw.1

Its flippers were long, making up about 25 percent of its total body length.1

Seeleyosaurus lived during the Toarcian age of the Jurassic period, between 184.2 and 182.9 million years ago.3

The first fossil of Seeleyosaurus was found in the Posidonia Shale, a famous rock formation in Germany known for its well-preserved fossils.3 1

Scientists once thought Seeleyosaurus was a type of Plesiosaurus, but later studies showed it was its own genus.1

Seeleyosaurus had a short neck compared to some other plesiosaurs, with 35 neck vertebrae.3

The species name guilelmiimperatoris means 'of Emperor William', honoring the German emperor.1

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

?How big was Seeleyosaurus?

It was a relatively small plesiosaur, measuring about 2.88 to 3.66 metres (9.4 to 12.0 feet) long and weighing around 199 kilograms (439 pounds).2

?What did Seeleyosaurus eat?

It ate fish and other small sea creatures, catching them with its sharp teeth.2

?Is Seeleyosaurus a dinosaur?

No, it is not a dinosaur. Seeleyosaurus is a plesiosaur, a type of marine reptile that lived in the sea during the Jurassic period.2

給恐龍專家

學名: Seeleyosaurus
命名者: White 19403
類群: 蛇頸龍類
科 / 演化支: Microcleididae3
分類: Plesiosauria > Sauropterygia3
岩石的年代: 184 到 183 百萬年 (Toarcian)3
岩層: Posidonia Shale3
國家: 德國3
化石紀錄: The Paleobiology Database 收錄 2 筆3
發現: The first Seeleyosaurus fossil was described by German paleontologist Wilhelm Dames in 1895, who named it Plesiosaurus guilelmiimperatoris. In 1940, American paleontologist Theodore White gave it the new genus name Seeleyosaurus.3 1
仍有爭議: Scientists still debate whether Seeleyosaurus was a type of elasmosaur or a microcleidid, because different studies place it in different groups.3 1