恐龍卡第 0660 張，共 2 027 張

Fluvionectes

名字的意思： “river swimmer”1

吃：肉蛇頸龍類白堊紀晚期嚴格來說不是恐龍

Fluvionectes was a long-necked marine reptile that swam in rivers and estuaries, not the open ocean. It was a type of plesiosaur called an elasmosaur, and it hunted fish and other prey in the water.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

84 到 72 百萬年前5

白堊紀晚期

化石發現地

Fossils were found in the Dinosaur Park Formation in southern Alberta, Canada, near Onefour.1

長度

5 到 7 m (16 到 23 ft)1

體重

392 kg (864 lb)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？

牠有多重？

跟 20 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 78 顆西瓜一樣重跟 21 個幼兒園小朋友一樣重跟 12 個小學生一樣重能在 6.2 秒內游完一座大泳池（50 公尺）

Fluvionectes 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)

Fluvionectes 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

Fluvionectes is one of the few plesiosaurs found in non-marine rocks, meaning it lived in rivers and estuaries, not the open ocean.1

The holotype skeleton was found disarticulated, scattered over an area of about 2.5 square metres, with only two rib bones still connected.1

Fluvionectes had 22 dorsal vertebrae, which is a unique feature that helps scientists identify it as a new species.1

The name Fluvionectes comes from Latin and Greek words meaning 'river swimmer', because it lived in rivers.1

The species name sloanae honours Donna Sloan, who discovered the holotype and worked as a scientific illustrator at the Royal Tyrrell Museum.1

Fluvionectes was smaller than many other elasmosaurids that lived in the ocean, which might be because it lived in rivers.1

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

?How big was Fluvionectes?

About 5 to 5.2 metres (16 to 17 ft) long for the holotype, and the largest known specimen may have reached 7 metres (23 ft).2 3

?What did Fluvionectes eat?

It hunted fish and other vertebrates in the water, using its slender tooth and powerful flippers to catch prey.4

?Where did Fluvionectes live?

It lived in rivers and estuaries (brackish water) in what is now Alberta, Canada, not in the open ocean like most other elasmosaurs.2 3

?Is Fluvionectes a dinosaur?

No, it is a plesiosaur, a type of marine reptile that lived in the water during the time of dinosaurs.2

迷思破解王

迷思： Some people think all plesiosaurs lived only in the ocean.

真相： Fluvionectes shows that some plesiosaurs lived in rivers and estuaries, not just the open sea.1

給恐龍專家

學名: Fluvionectes
命名者: Campbell et al. 20215
類群: 蛇頸龍類
科 / 演化支: Elasmosauridae5
分類: Plesiosauria > Elasmosauridae > Sauropterygia5
岩石的年代: 84 到 72 百萬年 (Campanian)5
岩層: Dinosaur Park5
國家: 加拿大5
化石紀錄: The Paleobiology Database 收錄 6 筆5
發現: The holotype was discovered by Donna Sloan in the Dinosaur Park Formation in Alberta, Canada. It was named by Campbell and colleagues in 2021.1
仍有爭議: Scientists are still debating why Fluvionectes was smaller than ocean-living elasmosaurids, and whether it spent its whole life in rivers or moved between fresh and salt water.1