恐龍卡第 1947 張，共 2 027 張

Xiphodracon

名字的意思： “sword-like dragon”1

吃：肉魚龍類侏羅紀早期嚴格來說不是恐龍

Xiphodracon was a marine reptile that swam in the Jurassic seas. It had a very long, narrow snout like a sword and big eyes. It is one of the most complete ichthyosaurs ever found from its time.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

193 到 184 百萬年前4

侏羅紀早期

化石發現地

Dorset coast, United Kingdom (England)2 1

長度

3 m (9.8 ft)1

最高速度

時速約 48 公里（30 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 3 隻狗從鼻子接到尾巴一樣長跟 17 根香蕉頭尾相接一樣長能在 3.8 秒內游完一座大泳池（50 公尺）

Xiphodracon 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)

Xiphodracon 時速約 48 公里 (30 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

Xiphodracon had a skull 64.2 cm (25.3 inches) long, with a very narrow and pointed snout.1

Its eyes were large and almost filled by a ring of about 17 bony plates called a scleral ring.1

The only known Xiphodracon fossil shows signs of injuries: a broken collarbone, bad teeth, and bone damage from diving problems.1

This individual probably died after being bitten on the head by a larger predator, possibly a Temnodontosaurus up to 9 metres (30 feet) long.1

Xiphodracon is the most complete ichthyosaur skeleton ever found from the Pliensbachian age, about 185 million years ago.1

It is closely related to Hauffiopteryx, and together they form a group called Hauffiopterygia.3

Xiphodracon 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Xiphodracon 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: Xiphodracon
命名者: Lomax et al. 20254
類群: 魚龍類
科 / 演化支: Leptonectidae4
分類: Ichthyosauria > Ichthyosauromorpha4
岩石的年代: 193 到 184 百萬年 (Pliensbachian)4
岩層: Charmouth Mudstone4
國家: 英國4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: The fossil was found by Chris Moore in 2001 near Golden Cap on the Jurassic Coast of England. It was named Xiphodracon goldencapensis by Dean Lomax, Judy Massare, and Erin Maxwell in 2025.1
仍有爭議: Scientists are still debating exactly how Xiphodracon is related to other ichthyosaurs, and whether it represents a new group that appeared during the Pliensbachian.3