恐龍卡第 0380 張，共 2 027 張

Chacaicosaurus

名字的意思： “Chacaico lizard, named after the Chacaico Sur locality”1

吃：肉魚龍類侏羅紀中期嚴格來說不是恐龍

Chacaicosaurus was a fast-swimming marine reptile that lived in the ocean during the Jurassic Period. It had a very long snout and big eyes to spot its prey. Even though it looked like a fish, it was a reptile that breathed air and gave birth to live babies underwater.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

171 到 169 百萬年前2

侏羅紀中期

化石發現地

Chacaico Sur locality, Neuquén Province, Argentina1 2

最高速度

時速約 46 公里（29 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)

Chacaicosaurus 時速約 46 公里 (29 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

Chacaicosaurus had a very long snout that made up 80% of its skull length.1

It had unique rounded ridges running along each side of its snout, which no other ichthyosaur has.1

Adult Chacaicosaurus may have had very small teeth or even no teeth at all.1

The only known fossil of Chacaicosaurus was found in 1990 by a team led by Zulma Gasparini.1

Chacaicosaurus lived about 170 to 168 million years ago, during the early Bajocian stage of the Jurassic.1

Its name comes from the Chacaico Sur locality and the Greek word for lizard, while the species name cayi honors the Mapuche sea god Cay.1

Chacaicosaurus shared its ocean home with another ichthyosaur called Mollesaurus and a plesiosaur named Maresaurus.1

Chacaicosaurus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Chacaicosaurus 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: Chacaicosaurus
命名者: Fernandez 19942
類群: 魚龍類
科 / 演化支: Baracromia2
分類: Ichthyosauria > Ichthyosauromorpha2
岩石的年代: 171 到 169 百萬年 (Bajocian)2
國家: 阿根廷2
化石紀錄: The Paleobiology Database 收錄 1 筆2
發現: Chacaicosaurus was named by paleontologist Marta Fernández in 1994, based on a single partial skeleton found in the Los Molles Formation of Argentina.1 2
仍有爭議: Scientists are not sure whether Chacaicosaurus belongs in its own genus or should be classified as a species of Stenopterygius.1