Abstract
Cell division frequency in the carapace epidermis of D. magna declines with increasing animal size. Cell division is not necessarily one of the activities of premolt. During any particular intermolt the dividing cells are larger than those that do not divide but their size is also related to animal size, the cells in small animals dividing at a smaller average size than in larger individuals. Cell abundance following mitosis and prior to ecdysis consequently is not fixed but depends on animal size. The synthesis of an ephippium appears to be accompanied by cell division frequencies much higher than those occurring contemporaneously in other regions of the carapace.
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