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A more elaborate drawing of the cytopharynx including the addition of
acidosomes (ac) and carrier vesicles (cav) to the
picture as well as the endocytic activity of parasomal sacs
(ps). Parasomal sacs end as clathrin coated pits that pinch off
into clathrin-coated vesicles. These vesicles lose their coats
(prev) and fuse with early endosomes (ee). Early
endosomes form coated buds that pinch off first into coated carrier
vesicles (cov) and then uncoated carrier vesicles that bind to
cytopharyngeal ribbons where they are moved toward the cytopharynx
(cp). When they encounter acidosomes, also moving along the
ribbons, they dock at and fuse with the acidosomes. The acidosomes
then dock at the forming food vacuole membrane (nfv). The row
of basal bodies of the quadrulus next to the cytopharynx gives rise to
short ribbons of microtubules of unknown function that curve away from
the cytopharynx when they encounter the meshwork of the filamentous
reticulum (fr). Thus endocytosis meets phagocytosis in this
region of the cell. disc, discoidal vesicles. Unpublished
drawing by R. Allen.
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