放射状对称的动物，囊状身体覆有刺样结构的触须，只有一个开口；它们以珊瑚和水母的形式出现。

Radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms.

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例如，冬青属植物的叶子有锋利无比的刺是为了挫败草食类动物。

For example, the leaves of the Holly plant have sharp spines that discourage grass-eating animals.

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一项调查研究显示，这里有168种长须鲸，包括珊瑚在内的60种刺胞动物、8种软体动物、14种海绵、11种棘皮类动物、15种节肢动物和8种a环节蠕虫。

A survey has revealed 168 species of finfish, 60 species of cnidaria, including corals, eight molluscs, 14 sponges, 11 echinoderms, 15 arthropods and eight annelid worms.

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