海胆的别名叫“棘锅子”、“海刺猬”、“棘球”和“海针”等;它的体形呈球形,有的呈半球形;大多生活于海底,喜欢栖息在海藻丰富的潮间带以下的海区礁林间或石缝中,以及坚硬沙泥质浅海地带,具有避光和昼伏夜出的特性。靠棘刺防御敌害。海胆特别爱吃海带、裙带菜以及浮游生物,同 Sea urchins are called “echinoderm”, “sea hedgehog”, “echinoderm” and “sea needle” and so on; its shape is spherical, and some were hemispherical; most live in the sea, like to inhabit the rich seaweed tide With the following sea reef forest or stone, as well as hard sandy muddy shallow sea, with dark and nocturnal characteristics. Spine to defend against predators. Sea urchins in particular love to eat kelp, wakame and plankton, with