恐龍卡第 1124 張，共 2 027 張

Makhaira

名字的意思： “blade with a curved outline, from Ancient Greek”1

吃：肉蛇頸龍類白堊紀早期嚴格來說不是恐龍

Makhaira was a fierce marine reptile that swam in the ancient seas of Russia about 130 million years ago. It had special teeth that were shaped like blades and had tiny saw-like edges, perfect for slicing through big prey.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

133 到 126 百萬年前3

白堊紀早期

化石發現地

Ulyanovsk Oblast, Russia, along the banks of the Volga River1

長度

4 到 6 m (13 到 20 ft)1

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 6.7 秒內游完一座大泳池（50 公尺）

Makhaira 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)

Makhaira 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

Makhaira's teeth had serrated edges with tiny bumps that were taller than they were wide, making them look like a saw blade.1

Its tooth sockets were arranged in pairs, which is unusual for pliosaurids.1

Makhaira is the oldest known member of the brachauchenine group of pliosaurids from the Cretaceous period.1

The teeth of Makhaira look very similar to those of metriorhynchid crocodylomorphs, which were ancient crocodile-like reptiles.2

Makhaira lived about 130 million years ago during the Hauterivian stage of the Early Cretaceous.2 3

Only a partial skeleton of Makhaira has been found, including parts of the skull, teeth, vertebrae, and hip bones.1

Makhaira 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Makhaira 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: Makhaira
命名者: Fischer et al. 20153
類群: 蛇頸龍類
科 / 演化支: Pliosauridae3
分類: Plesiosauria > Pliosauridae > Sauropterygia3
岩石的年代: 133 到 126 百萬年 (Hauterivian)3
國家: 俄羅斯3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Makhaira was named in 2015 by a team of scientists including V. Fischer, based on a partial skeleton found in pyrite nodules along the Volga River in Russia.3 1
仍有爭議: Scientists are still debating whether Makhaira's serrated teeth mean it was more like Jurassic pliosaurids or if it was a unique early brachauchenine.1