Abstract
Nuclear division in the labyrinthulid-like protist,Sorodiplophrys stercorea was studied and compared to the mitotic processes reported in other protistan forms.S. stercorea was found to have centrioles with nine peripheral singlet microtubules and a tubular core 300–400 A in diameter. The nuclear envelope remains intact throughout division, with microtubules passing through nuclear pores. The nucleolus disappears during nuclear division. After intranuclear division, cells cleave by introgressive cleavage while pronucleoli appear in the nuclei and fuse to form the single nucleolus characteristic of the interphase nucleus.
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