Abstract
The fifth stage larval epidermis of Calpodes ethlius (Lepidoptera. Hesperiidae) is a syncytium of doublets where sibling cells are twins connected by residual midbodies between divisions. Twin cells resemble one another more than their other neighbours in such features as the shape and number of nucleolar particles, the number of actin bundles and the position of condensed female chromosomes. We have now found that they also resemble one another in the timing of cell division in preparation for pupation. Twins are more likely to divide together than at random. The paired timing of mitosis is presumed to be a result of the twins sharing a common cytoplasm.
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