Abstract
A new type of amitotic nuclear division in differentiating striated muscle cells of insects (Dermatobia cyaniventris Macquart, Polybia scutellaris White, Photinus fuscus and Acromyrmex lundi) is described. It consists of a process of multiple fragmentation of a single chromatic cord, a sort of giant longitudinal macronucleus which extends almost the entire length of the immature muscle cell. We have designated this interesting nuclear structure as polykaryonema and this amitotic nuclear division process as clasmatothenesis.
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