恐龍卡第 1303 張，共 2 027 張

Ogmodirus

名字的意思： “swollen shin bone”1

吃：肉蛇頸龍類白堊紀晚期嚴格來說不是恐龍

Ogmodirus was a long-necked marine reptile that swam in the shallow seas of ancient Kansas. It was not a dinosaur, but a fierce hunter of fish and other sea creatures.1 3

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

94 到 90 百萬年前3

白堊紀晚期

化石發現地

Kansas, USA, in the Greenhorn Limestone formation1 2

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)

Ogmodirus 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

Ogmodirus lived about 94 to 89 million years ago, during the Late Cretaceous period.1 2

The first fossil, called KUVP 441, was found in 1909 by C. Boyce in Cloud County, Kansas. It included a pelvis, limb bones, and more than 50 neck vertebrae from a young animal.1

Ogmodirus is known from a juvenile skeleton, so scientists are not sure how big adults could get.1

Some scientists think Ogmodirus belongs to the elasmosaur family, which includes Elasmosaurus, but the fossils are too incomplete to be sure.1

A second species, Ogmodirus ischiadicus, was later moved to a different genus called Styxosaurus.1

The name Ogmodirus means 'swollen shin bone', which refers to a feature of its leg bones.1

Ogmodirus 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Ogmodirus 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。

迷思破解王

迷思： Ogmodirus was a dinosaur.

真相： Ogmodirus was a plesiosaur, a marine reptile, not a dinosaur. Dinosaurs lived on land, while plesiosaurs swam in the ocean.1

給恐龍專家

學名: Ogmodirus
命名者: Williston and Moodie 19133
類群: 蛇頸龍類
科 / 演化支: Elasmosauridae3
分類: Plesiosauria > Elasmosauridae > Sauropterygia3
岩石的年代: 94 到 90 百萬年 (Turonian)3
岩層: Greenhorn Limestone3
國家: 美國3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Ogmodirus was named by Samuel Wendell Williston and Roy Lee Moodie in 1913, based on a fossil found in Kansas in 1909.1
仍有爭議: Scientists debate whether Ogmodirus is a valid genus or a dubious one, because the only known skeleton is incomplete and from a juvenile.1 2