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Details of the origins of the cytopharyngeal ribbons (cp mt)
and the quadrulus associated ribbons (qar). At first view the
cytopharyngeal ribbons look like they might arise next to basal bodies
but it is clear that the cytopharyngeal ribbons arise only from the
filamentous reticulum. The quadrulus associated ribbons appear to be
analogous to the postciliary microtubules of the somatic ciliature
that they curve posteriorly from the quadrulus. However quadrulus
associated ribbons do pass very close or even touch the ends of the
cytopharyngeal ribbons without becoming part of these latter ribbons.
Discoidal vesicles (disc) bind to the anterior sides
(observer’s left) of the cytopharyngeal ribbons and the smaller set of
ribbons lies at its posterior side (arrowheads) against the
cytopharyngeal membrane. The tubular fingers of the alveoli
(al) pass between the cytopharyngeal ribbons next to the nodes
of the filamentous reticulum (fr) from which the cytopharyngeal
ribbons originate. Finally a row of parasomal sacs is seen along the
dorsal edge of the quadrulus from which coated vesicles form. EM taken
on 5/23/73 by R. Wolf with Hitachi HU11A TEM. Neg. 16,250X. Bar =
0.5µm.
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