恐龍卡第 1436 張，共 2 027 張

Placochelys

名字的意思： “plate turtle”1

吃：肉海生爬蟲類三疊紀晚期到白堊紀晚期嚴格來說不是恐龍

Placochelys was a marine reptile that looked a lot like a sea turtle, but it wasn't a turtle. It swam in warm seas during the Triassic Period, using its paddle-like limbs to glide 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

237 到 72 百萬年前4

三疊紀晚期到白堊紀晚期

化石發現地

Germany, Austria, Hungary, and Italy1

長度

0.9 m (3 ft)1

最高速度

時速約 6 公里（4 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 5 根香蕉頭尾相接一樣長能在 30 秒內游完一座大泳池（50 公尺）

Placochelys 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)

Placochelys 時速約 6 公里 (4 mph)

騎腳踏車的小朋友 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

Placochelys had a flat, turtle-like shell made of knobbly plates, but it was not a turtle. It was a type of reptile called a placodont.1

Its skull was compact and triangular, with a beak and powerful jaw muscles for crushing food.1

Unlike modern sea turtles, Placochelys still had visible toes on its paddle-shaped limbs, and it had a short tail.1

Placochelys lived about 221 to 205 million years ago, during the Late Triassic Period.1

It had only two pairs of teeth on the roof of its mouth: a large pair at the back and a small pair near the front.1

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

?How big was Placochelys?

About 90 centimetres (3 feet) long.1 3

?What did Placochelys eat?

Shellfish and other hard-shelled prey. It used its broad, crushing teeth on the roof of its mouth to break them open.1 3

?Could Placochelys walk on land?

It may have occasionally ventured onto land, because its paddle-shaped limbs still had visible toes, unlike modern sea turtles.3

?When did Placochelys go extinct?

It lived during the Late Triassic Period, from about 221 to 205 million years ago, and died out by the end of the Triassic.1

迷思破解王

迷思： Placochelys was a sea turtle.

真相： Placochelys looked like a sea turtle, but it was a different kind of marine reptile called a placodont. It was not closely related to modern turtles.1

給恐龍專家

學名: Placochelys
命名者: Jaekel 19024
類群: 海生爬蟲類
科 / 演化支: Placochelyida4
分類: Placodontia > Sauropterygia4
岩石的年代: 237 到 72 百萬年 (Carnian / Campanian)4
岩層: Gorno, Hauptdolomit, Veszprém Marl4
國家: 義大利, 奧地利, 匈牙利4
化石紀錄: The Paleobiology Database 收錄 5 筆4
發現: Placochelys was named by German paleontologist Otto Jaekel in 1902. The first fossils were found in Hungary.1 2
仍有爭議: Scientists are still debating how Placochelys is related to other placodonts. Some think it might be the same as another genus called Psephoderma.2