The differentiation of trochoblasts in Nereis virens and Platynereis dumerilii embryos was investigated under condition of DNA replication block during different time after fertilization. It was shown that quantal cycle of ciliogenesis is not connected directly with the time of primary trochoblast founder cell formation. Cilia development of trochoblasts in P.dumerilii needed normal DNA replication at fifth cycle. Ciliogenesis in N.virens completely stopped after the inhibition of replication at fourth cycle and only partly when fifth and sixth rounds of DNA replication were damaged. The data obtained are discussed from the standpoint of Newport and Kirschner`s "depletion" hypothesis (1982).
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