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A freeze-fracture replica of the cytopharynx showing the pleated
cytopharyngeal membrane that covers the ends of the microtubular
ribbons. Impressions of the docked acidosomes are seen on the expanse
of the nascent vacuole membrane. In the lower half of the picture the
fracture plane passes through discoidal vesicles ready to fuse with
the cytopharyngeal (cp) membrane and acidosomes either docked
at the nascent vacuole membrane that has been fractured away in this
area or are ready to dock with the vacuole. A portion of a digestive
vacuole surrounded by lysosomes lies to the lower right. The vacuole
contains bacteria. A band of IMPs runs along the terminal ends of
alveoli (al). cc, cytostomal cord; tric,
trichocyst; qu, quadrulus; dor pen, dorsal peniculus. EM
taken on 9/28/78 by R. Allen with Hitachi HU11A TEM. Neg. 8,000X. Bar
= 0.5µm. Published in J. Ultrastruct. Rev. 63:64-78, 1978.
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