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The cytoproct is the cell’s defecation site where spent digestive
vacuoles fuse with the plasma membrane. In this cell the cytoproct is
closed and forms a ridge along the posterior suture on the ventral
side of the cell. The ridge contains distinctive fibers not found in
other parts of the cell. It is covered on its sides by alveoli but has
a single membrane over the crest of the ridge (arrow). The
somatic basal bodies on both sides of the ridge give rise to
microtubular bundles that extend into the endoplasm where they lie
against the surface of approaching spent vacuoles (DV-IV). The spent
vacuole has tubular extensions (arrowheads) protruding from its
membrane. EM taken on 4/13/73 by R. Allen with Hitachi HU11A TEM. Neg.
13,250X. Bar = 0.5µm.
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