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指各个员之间在形态和功能上分工明显的一种群体。有刺胞动物水螅类的水螅型（水螅体）之介穗螅属，除具有典型的水螅体，即营养个员外，还有指状个员、螺旋个员、刺状个员和子茎等。子茎上着生子囊或长出水母芽，构成群体的生殖体部分。而营养个员、刺状个员则不参与生殖，在这一意义上可称为营养体部分。此外，管水母类是由游泳体、叶状体和营养体、生殖体、指状体及触手等集聚而成之群体，这样的1组集合体（称为轴群）每隔一定的间隔，藉1条相通的轴联络而形成复合的群体。苔藓虫类除具容纳普通的个员的虫房外，还有卵房、振鞭体和鸟头体。
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