第 1271 號，共 1 402 號

Savigny's long-spined urchin

Diadema savignyi

名字的由來： The species name honours Marie Jules César Savigny, a French zoologist who described many new marine species from the Mediterranean and Red Sea.1

只是會痛不要碰會痛，但不會對你造成嚴重傷害。

海膽、海星和蟲

有毒液的棘刺吃：植物

對人的危險: 疼痛可能會非常痛，但幾乎從來不會很嚴重。

Savigny's long-spined urchin is a spiny sea animal that lives on reefs and in shallow lagoons. It has very long, thin spines that can grow up to 25 cm, and it comes out at night to graze on algae. Its spines are the part that can hurt people, so it is worth giving it plenty of room.1

分布在

East coast of Africa, Red Sea, Indian Ocean, western Pacific, French Polynesia, Hawaii, New Caledonia and northern Australia1

印度洋, 太平洋, 紅海, 阿拉伯海與波斯灣, 帝汶海與阿拉弗拉海, 孟加拉灣

首頁

It is found on mixed sandy, rocky and coral seabed, especially in places disturbed by storms or other natural events. It lives from the surface down to about 70 metres deep. It often hides in crevices or under boulders during the day.1

長度

9 cm (3,5 in)1

最高速度

大約 0,02 km/h（0,01 mph）

游泳, 粗略估計

牠吃什麼？

It feeds at dusk on the algal mat that grows over the seabed, tearing it up as it grazes. This helps keep algae from overwhelming corals.1

Savigny's long-spined urchin 的照片 — Savigny's long-spined urchin。照片：Anders Poulsen, Deep Blue (http://www.colours.dk/)。 CC BY-SA 3.0, Wikimedia Commons.

怎麼認出牠

Usually black, with a rounded body (called a test) up to about 9 cm across1
Long, thin, hollow spines that grow in tufts and can reach 25 cm; they are usually black but can be grey, dark brown or purple1
Juveniles may have bands of lighter and darker shades, and the occasional individual is completely white1
Iridescent green or blue lines around the interambulacral areas and around the periproct (the cone-shaped region surrounding the anus)1

常被誤認為： It is very similar to Diadema setosum, which shares much of its range and often lives in the same groups. Savigny's long-spined urchin lacks the thin orange ring around the periproct that Diadema setosum has.1

毒液力量

有毒液的棘刺

尖銳的棘刺帶著毒液。踩到或抓到牠都會很痛。

牠對人有多危險？

對人的危險: 疼痛可能會非常痛，但幾乎從來不會很嚴重。

牠害怕時會做什麼？

When a shadow falls on it, it angles its spines towards the possible attacker.1

如果牠的棘刺刺到你

把傷口泡在熱水裡，水溫要在傷者能忍受、又不會燙傷的範圍內，並就醫請醫生取出棘刺。不要自己挖出來。

一定要先打緊急電話（112、000、911）。這是一般急救指引，不是醫療建議。急救基本知識

注意安全

絕對不要碰、抓或捉弄野生動物，就算是很小的動物，就算牠看起來在睡覺或已經死了也一樣。
給牠空間。如果遇到了，保持冷靜，慢慢往後退，讓牠自己離開。
如果被牠的棘刺刺到：保持冷靜，保持不動，打緊急電話（112、000、911）或趕快去醫院。記住牠的樣子，有照片會很有幫助。

牠不是想來抓你。牠用毒液來捕捉食物或保護自己，而且牠更想躲起來。更多安全知識

在世界上的哪裡？

非洲亞洲歐洲北美洲南美洲澳洲與大洋洲太平洋印度洋紅海阿拉伯海與波斯灣帝汶海與阿拉弗拉海孟加拉灣

牠有多大？

牠有多長？

跟 3 塊玩具積木排成一排一樣長比花園蝸牛還慢

Savigny's long-spined urchin 跟「你」比起來有多大？

只是在你的瀏覽器裡做算術。什麼都不會儲存，也不會傳送到任何地方。

牠有多快？

一隻海馬 大約 0,0015 km/h (0 mph)

Savigny's long-spined urchin 大約 0,02 km/h (0,01 mph)

一隻花園蝸牛 大約 0,05 km/h (0,03 mph)

值得知道

小知識

Its spines are brittle, thin and hollow, and grow in tufts that can be as long as 25 cm.1

Small fish such as cardinal fish, flatworms and shrimps sometimes shelter among its long spines.1

It spawns just after the full moon, while its close relative Diadema setosum mostly spawns around days eight to ten of the lunar cycle, which keeps the two species from interbreeding.1

Its grazing helps control algae, which might otherwise smother corals.1

It is nocturnal, hiding in crevices or under boulders by day, though several individuals sometimes huddle together in the open.1

Its predators include pufferfish, porcupinefish, lobsters and snails.1

給毒液專家

學名: Diadema savignyi
類群: 海膽、海星和蟲
家人: Diadematidae2
排序: Diadematoida
各大洲: 印度洋, 太平洋, 紅海, 阿拉伯海與波斯灣, 帝汶海與阿拉弗拉海, 孟加拉灣, 海洋
寶寶: It does not have live young. Instead it releases eggs and sperm into the water (spawning), mainly during the north-east monsoon period, peaking in May, and timed to the lunar cycle.1
對人的危險: 2 / 5: 疼痛3