恐龍卡第 0630 張，共 2 027 張

Eternauta

名字的意思： “eternal sailor”1

吃：肉魚龍類侏羅紀晚期到白堊紀早期嚴格來說不是恐龍

Eternauta was a fast-swimming marine reptile that lived in the ocean during the Late Jurassic. It had a long snout and big eyes to hunt small, slippery prey like fish and squid.1 5

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

145 到 143 百萬年前5

侏羅紀晚期到白堊紀早期

化石發現地

Chacay Melehue, Neuquén Province, Patagonia, Argentina1 5

長度

4 到 6 m (13 到 20 ft)3 4

最高速度

時速約 43 公里（27 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 6 隻狗從鼻子接到尾巴一樣長跟 33 根香蕉頭尾相接一樣長能在 4.2 秒內游完一座大泳池（50 公尺）

Eternauta 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)

Eternauta 時速約 43 公里 (27 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

Eternauta is named after a character from an Argentine science fiction comic called The Eternaut, which means 'the eternal traveler'.1

Its skull shows it had a special jaw that could open and close very fast, perfect for catching quick prey.1

Eternauta had a large scleral ring in its eye, which helped it see in dark, deep water.1

This ichthyosaur lived in the same sea as other marine reptiles like Caypullisaurus, but it ate different food to avoid competition.1

The only known fossil of Eternauta includes a nearly complete skull, a rib, and a front flipper.1

Eternauta belongs to a group of ichthyosaurs called ophthalmosaurids, which had very large eyes.1 2

Eternauta 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Eternauta 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: Eternauta
命名者: Campos et al. 20255
類群: 魚龍類
科 / 演化支: Ophthalmosauridae5
分類: Ichthyosauria > Ichthyosauromorpha5
岩石的年代: 145 到 143 百萬年 (Tithonian)5
岩層: Vaca Muerta5
國家: 阿根廷5
化石紀錄: The Paleobiology Database 收錄 1 筆5
發現: The fossil was first found in the Vaca Muerta Formation in Argentina and was originally thought to be a different ichthyosaur. In 2025, scientists Lisandro Campos and colleagues named it Eternauta patagonica.1
仍有爭議: Scientists are still debating exactly how Eternauta is related to other ichthyosaurs, because different computer analyses give different family trees.1