the v-shaped arrangement of the basal bodies in the flagellar apparatus , as well as the presence of proximal sheaths and of two layers of scales on the cell body , further identifies the chaetopeltis zoospore as a primitive cell type within the chlorophyceae . trends towards the exsertion of basal bodies from a flagellar pit , either apically or laterally , the elimination of quadriflagellate cells , and , in the chlorophyceae , an increasing amount of basal body offset , indicate advancement within the classes .
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