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animal
>
grasshook echinus
镰刀海胆
[plegiocidaris]
目:头帕海胆目;科:头帕海里胆科;俗名:海胆;时代:侏罗纪;分布:欧洲。
圆形并且微扁的介壳是由5对窄小步带骨板柱和5对宽阔的步带区间组成,而步带区间又是由带有突出结节的大骨板组成。顶部的孔是顶盘。
产地:
镰刀海胆
以海藻为食,生活在多岩石的海底。
附注:活着时结节上长有巨大的壳针。