恐龍卡第 0461 張，共 2 027 張

Cryonectes

名字的意思： “cold swimmer”1

吃：肉蛇頸龍類侏羅紀早期嚴格來說不是恐龍

Cryonectes was a marine reptile that lived in the Early Jurassic seas, about 185 to 183 million years ago. It was a pliosaur, a type of plesiosaur with a big head and a short neck, built to hunt other sea creatures. Its fossils were found in Normandy, France.1 3

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

193 到 184 百萬年前3

侏羅紀早期

化石發現地

Roche-Blain quarry, Fresney-le-Puceux, near Laize-la-Ville, Normandy, France3 1

長度

3 到 4 m (9.8 到 13 ft)1 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？

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 6.2 秒內游完一座大泳池（50 公尺）

Cryonectes 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)

Cryonectes 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

Cryonectes is known from a partial skull, lower jaw, and ten vertebrae, which were collected in the 1980s from a quarry in France.1

Its skull is about 47 centimeters (19 inches) long, making it a moderate-sized pliosaurid.1

The name Cryonectes means 'cold swimmer' because it lived during a cool period in the Early Jurassic.1

Cryonectes was a subadult when it died, as shown by its vertebrae having open growth plates.1

Its snout is very long, and the lower jaw has a long symphysis (where the two halves meet) with seven tooth positions.1

Scientists think Cryonectes is one of the earliest pliosaurids, helping to show that pliosaurids evolved earlier than previously thought.2

Cryonectes 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Cryonectes 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。

給恐龍專家

學名: Cryonectes
命名者: Vincent et al. 20133
類群: 蛇頸龍類
科 / 演化支: Pliosauridae3
分類: Plesiosauria > Pliosauridae > Sauropterygia3
岩石的年代: 193 到 184 百萬年 (Pliensbachian)3
岩層: Calcaire à Bélemnites3
國家: 法國3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Cryonectes was named in 2012 by Peggy Vincent, Nathalie Bardet, and Emanuela Mattioli based on a fossil found in the 1980s in Normandy, France. The fossil was stored at the Musée de l’Agglomération d’Elbeuff in Elbeuf-sur-Seine.1 2
仍有爭議: Scientists are still debating exactly where Cryonectes fits in the pliosaur family tree, though it is thought to be a basal (early) pliosaurid.1 2