第 1273 号，共 1 402 张

Blue-black urchin

Echinothrix diadema

只是会疼不要触摸会疼，但不会对你造成严重伤害。

有毒的刺吃：植物

The blue-black urchin is a spiny sea animal that lives on tropical coral reefs. It is black or blue-black, with long spines that show a blue shine in the light. It grazes on algae during the night and hides in cracks and under rocks by day.1

生活在

Throughout the Indo-Pacific coral reefs, from the Red Sea to Hawaii1

印度洋, 太平洋, 红海, 珊瑚海, 菲律宾海, 帝汶海和阿拉弗拉海, 孟加拉湾

首页

It lives in shallow water, from the surface down to about 10 m, and can be found as deep as 70 m. By day it hides in crevices, burrows and under rocks.1

长度

10 cm到20 cm (3.9 in到7.9 in)1

最高速度

约 0.02 公里/小时（0.01 英里/小时）

游泳, 粗略估计

它吃什么？

It grazes on algae and seagrass, and in Fiji its grazing choices matched its favourite algae, Codium geppiorum. Its grazing adds to the wearing down of coral reef structures by echinoids (sea urchins).1

Blue-black urchin的照片 — Blue-black urchin。照片：Cricket Raspet。 CC BY 4.0, iNaturalist.

怎样认出它

It is black or blue-black and always dark in colour.1
Its spines show a blue sheen in the light.1
Its spines are long and closed at the tip.1
Its anal sac is small and dark, and it is hardly visible.1
Its typical diameter, including the spines, is 10 to 20 cm.1

常被误认为： Echinothrix calamaris has banded spines, except in juveniles, and dark forms show a greenish tinge rather than blue. Diadema setosum has longer spines, a smaller test (the body shell) and an orange ring around its anal sac.1

毒液之力

有毒的刺

锋利的刺带着毒液。踩到或抓住它会很疼。

它对人有多危险？

对人的危险: 很疼可能真的很疼，但几乎从不严重。

如果它的刺扎到你

把伤口泡在热水里，水温以不烫伤为限、尽量热，然后去看医生取出刺。不要自己去挖。

一定先拨打你的急救电话（112、000、911）。这里是一般急救指导，不是医疗建议。急救基础

注意安全

永远不要摸、抓或逗弄野生动物，即使是很小的，即使它看起来在睡觉或已经死了。
给它留出空间。如果遇到它，保持冷静，慢慢后退，让它走自己的路。
如果它的刺扎到你：保持冷静，保持不动，拨打你的急救电话（112、000、911）或尽快去医院。记住它长什么样，拍张照片会有帮助。

它不是冲着你来的。它用毒液捕猎或保护自己，而且它更愿意躲起来。更多安全知识

在世界哪里？

非洲亚洲欧洲北美洲南美洲澳大利亚和大洋洲太平洋印度洋红海珊瑚海菲律宾海帝汶海和阿拉弗拉海孟加拉湾

它有多大？

它有多长？

和 6 块玩具积木排成一排一样长比花园蜗牛还慢

Blue-black urchin和你比起来有多大？

只是在你的浏览器里算一算。什么都不会被保存或发送到任何地方。

它有多快？

一只海马 约 0.0015 公里/小时 (0 mph)

Blue-black urchin 约 0.02 公里/小时 (0.01 mph)

一只花园蜗牛 约 0.05 公里/小时 (0.03 mph)

值得了解

事实

The shrimp Stegopontonia commensalis lives on it, and the shrimp Saron marmoratus stays close to it for protection.1

Fish of the families Apogonidae (cardinalfish) and Centriscidae (razorfish and relatives) also stay close to it for protection.1

Its grazing contributes to bioerosion, the slow wearing down of reef structures.1

It is active at night and hides in crevices, burrows and under rocks during the day.1

给毒液专家

学名: Echinothrix diadema
类别: 海胆、海星和蠕虫
家人: Diadematidae2
排序: Diadematoida
大洲: 印度洋, 太平洋, 红海, 珊瑚海, 菲律宾海, 帝汶海和阿拉弗拉海, 孟加拉湾, 海洋
宝宝: Females generally choose low-lying spots, which give their tiny larvae better protection from predators.1
对人的危险: 2 / 5: 很疼3