恐龍卡第 0011 張，共 2 027 張

Abyssosaurus

名字的意思： “bottomless lizard”1

吃：肉蛇頸龍類白堊紀早期嚴格來說不是恐龍

Abyssosaurus was a plesiosaur, a marine reptile that swam in the seas during the time of dinosaurs. It had a short, deep skull and hind fins that were bigger than its front fins. It probably lived in deep water, hunting soft-bodied prey.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

133 到 126 百萬年前5

白堊紀早期

化石發現地

Fossils were found near the Menya River in Chuvashia, Russia.2 1

長度

6.7 到 7 m (22 到 23 ft)4

體重

1.24 公噸 (2,700 lb)4

最高速度

時速約 26 公里（16 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？

牠有多重？

跟 62 隻狗一樣重

跟 7 隻狗從鼻子接到尾巴一樣長跟 39 根香蕉頭尾相接一樣長跟 250 顆西瓜一樣重跟 65 個幼兒園小朋友一樣重跟 39 個小學生一樣重跟 3 隻北極熊一樣重能在 6.9 秒內游完一座大泳池（50 公尺）

Abyssosaurus 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)

Abyssosaurus 時速約 26 公里 (16 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

Abyssosaurus is the youngest known Cretaceous representative of the Cryptoclididae family.1

Its skeleton shows features of an immature adult, a condition called paedomorphism, with a short and deep skull.1

Its hind fins were larger than its front fins, which may have helped it move in deep water.1

The first fossil found was a postcranial skeleton, but a partial skull was discovered later near the pectoral girdle and neck vertebrae.1

Scientists think it lived in deep-sea environments, based on its body shape and adaptations.1

Abyssosaurus lived about 132 to 125 million years ago, during the Hauterivian stage of the Early Cretaceous.2

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

?How big was Abyssosaurus?

Abyssosaurus was about 6.7 to 7 metres (22 to 23 feet) long, with about half of that being its neck. It weighed around 1.24 metric tons (1.37 short tons).4

?When did Abyssosaurus live?

Abyssosaurus lived during the Early Cretaceous, about 132 to 125 million years ago, in the Hauterivian stage.4 5

?What did Abyssosaurus eat?

It probably ate soft-bodied prey like cephalopods and crustaceans, which it hunted in deep water.4

?Could Abyssosaurus swim?

Yes, it was a marine reptile that swam in the seas. Its front flippers were longer than its hind ones, which may have helped it swim through the water.4

?Why did Abyssosaurus have a short skull?

Its short, deep skull was likely an adaptation for feeding on soft-bodied prey in deep water, and it also had very large eye sockets.4 1

?Is Abyssosaurus a dinosaur?

No, Abyssosaurus was a plesiosaur, a marine reptile, not a dinosaur. It lived during the time of dinosaurs but was not one itself.4

迷思破解王

迷思： Abyssosaurus was a dinosaur.

真相： Abyssosaurus was a plesiosaur, a marine reptile, not a dinosaur.1

給恐龍專家

學名: Abyssosaurus
命名者: Berezin 20115
類群: 蛇頸龍類
科 / 演化支: Cryptoclididae5
分類: Plesiosauria > Sauropterygia5
岩石的年代: 133 到 126 百萬年 (Hauterivian)5
國家: 俄羅斯5
化石紀錄: The Paleobiology Database 收錄 1 筆5
發現: Abyssosaurus was named and described by Alexander Yu Berezin in 2011, based on a postcranial skeleton found in Chuvashia, Russia.3 1
仍有爭議: Scientists debate whether Abyssosaurus belongs to the family Aristonectidae or Cryptoclididae, and some think it may be an intermediate form.3 1