Abstract
ABSTRACT. The ultrastructure of the cortex beneath the fission furrow of dividing Stentor coeruleus was examined using scanning and transmission electron microscopy. During division, basal bodies, axonemes, and km fibers beneath the furrow were absorbed near the moving primordial oral apparatus, and a circumferential band of microtubules and filaments was formed at the base of the furrow. The location and orientation of this fibrous band suggest that it may be an important component of the cytokinetic machinery. Treatment with vinblastine sulfate (4 × 10‐5 M) disrupted the circumferential microtubules and blocked division, which is consistent with this hypothesis.
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