恐龍卡第 1026 張，共 2 027 張

Leivanectes

名字的意思： “Leiva swimmer, named after Villa de Leiva in Colombia”1 2

吃：肉蛇頸龍類白堊紀早期嚴格來說不是恐龍

Leivanectes was a long-necked marine reptile that swam in the warm seas of Colombia about 115 million years ago. It was a plesiosaur, not a dinosaur, and it used its strong flippers to paddle through the water. This ocean hunter had a special short jaw with big teeth for catching large fish.1 2

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

120 到 113 百萬年前3

白堊紀早期

化石發現地

Villa de Leiva, Boyacá, Colombia (Paja Formation)1 2

最高速度

時速約 27 公里（17 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)

Leivanectes 時速約 27 公里 (17 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

Leivanectes had fewer and larger teeth than any other known elasmosaurid plesiosaur. It only had 3 teeth in the front of its lower jaw, while a similar plesiosaur called Callawayasaurus had 5.2

This plesiosaur lived during the Aptian stage of the Early Cretaceous, between about 119 and 113 million years ago.1

Leivanectes was named in 2019 by a team of scientists from Argentina and Colombia, including María Páramo-Fonseca and José O'Gorman.1 2

Its short jaw and big teeth suggest Leivanectes ate larger prey than other long-necked elasmosaurids, which usually ate small fish.2

Leivanectes is only known from a partial skull and lower jaw, so scientists are not sure how big its body was.2

Leivanectes 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Leivanectes 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: Leivanectes
命名者: Páramo-Fonseca et al. 20193
類群: 蛇頸龍類
科 / 演化支: Elasmosauridae3
分類: Plesiosauria > Elasmosauridae > Sauropterygia3
岩石的年代: 120 到 113 百萬年 (Aptian)3
岩層: Paja3
國家: 哥倫比亞3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Leivanectes was discovered in the Paja Formation of Villa de Leiva, Colombia, and named in 2019 by Páramo-Fonseca and colleagues. The species name bernardoi honors a local person named Bernardo.1 2
仍有爭議: Scientists are not sure how long Leivanectes' neck was, because only its skull has been found. It might have had a shorter neck than other elasmosaurids.2