恐龍卡第 1004 張，共 2 027 張

Lagenanectes

名字的意思： “Leine swimmer”1

吃：肉蛇頸龍類白堊紀早期嚴格來說不是恐龍

Lagenanectes was a long-necked marine reptile that swam in the seas of what is now Germany. It was not a dinosaur, but a plesiosaur, and it used its four flippers to paddle through the water. This ancient creature grew to about 8 meters long, as long as a school bus!2 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4

白堊紀早期

化石發現地

Lower Saxony, Germany1 2

長度

8 m (26 ft)2 1

最高速度

時速約 24 公里（15 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 8 隻狗從鼻子接到尾巴一樣長跟 44 根香蕉頭尾相接一樣長能在 7.5 秒內游完一座大泳池（50 公尺）

Lagenanectes 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)

Lagenanectes 時速約 24 公里 (15 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

Lagenanectes is one of the earliest known elasmosaurids, a group of plesiosaurs with very long necks. It lived about 130 million years ago during the Early Cretaceous.2 1

The front part of its lower jaw had a unique platform with dents, and the tooth sockets pointed sideways. This is different from most other plesiosaurs.1

Grooves on the top of its skull may have held electroreceptors, which helped Lagenanectes detect prey hidden in the dark water.1

The only known fossil of Lagenanectes shows signs of bone disease. The back of the skull and first neck vertebra had bony outgrowths, possibly from a bacterial infection.2 1

The fossil was discovered in 1964 by a private collector named Kurt Wiedenroth in a clay pit near Sarstedt, Germany. The pit no longer exists.2 1

Lagenanectes was named in 2017, more than 50 years after its discovery. Scientists finally studied the bones and realized it was a new genus.1

Lagenanectes 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Lagenanectes 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: Lagenanectes
命名者: Sachs et al. 20174
類群: 蛇頸龍類
科 / 演化支: Elasmosauridae4
分類: Plesiosauria > Elasmosauridae > Sauropterygia4
岩石的年代: 133 到 126 百萬年 (Hauterivian)4
岩層: Stadthagen4
國家: 德國4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: Lagenanectes was discovered in 1964 by fossil collector Kurt Wiedenroth in a clay pit near Sarstedt, Germany. It was named and described as a new genus and species by Sven Sachs, Jahn J. Hornung and Benjamin P. Kear in 2017.2 1
仍有爭議: The exact age of the Lagenanectes fossil is uncertain. It could be from the lower Hauterivian to lower Barremian stages, but scientists think it is most likely upper Hauterivian.2 1