Abstract
The fifth stage larval epidermis of Calpodes ethlius (Lepidoptera, Hesperiidae) is a syncytium of doublets where sibling cells remain connected by residual midbodies between mitoses. These twins resemble one another more than their other neighbours in features such as the shape and number of nucleolar particles, the number of actin bundles, the position of condensed chromosomes in female cells and the timing of mitosis. Although the patterns of arrangement of structures may be similar in twinned nuclei they differ in their orientation. We have now found that twins also differ in the orientation of their division planes with respect to the previous plane of division. Similarity of structural pattern but not orientation is most easily explained if nuclei, together with determinants for the plane of division, are free to rotate in the plane of the epithelium.
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