Figure 1.  Anatomy of 3 types of individuals in a colony of Bowerbankia, an arborescent type of bryozoan.  Individuals in arborescent colonies live attached to a common stolon.  A)  Individual zooid with its lophophore extended for feeding.  B)  Retracted individual.  C)  A degrading individual that is brooding an embryo.  Redrawn from Barnes, 1980.