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Food vacuoles arise from the single membrane that lines the
cytopharynx (cp). Vesicles (arrows), similar to
discoidal vesicles, attach to the cytopharyngeal microtubules
(lamellar clumps) (l) that arise from the dorsal ribbed wall
(rw) of the peristome (pi) and that pass beyond the
cytosome (cell mouth, see Fig. 1f). The cytopharynx swells and a food
vacuole balloons out through the ribs that are produced by the folded
cytopharyngeal membrane and the attached lamellae. How, why and when a
food vacuole pinches off needs further study. A myoneme (my)
equivalent to the cytostomal cord in Paramecium lies along the
origins of the lamellae (called cytopharyngeal ribbons in
Paramecium). pak, paraoral kinetids; precvch,
chamber with bacteria; mac, macronucleus. EM taken on 3/30/71
by R. Allen with Hitachi HU11A TEM. Mag. 9,250X. Bar = 1µm.
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