By Trebsdorf M.
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Extra resources for Anatomie, Biologie, Physiologie. Lehrbuch und Atlas
The suctorian Ciliophora do not exhibit the typical ciliate cytostome, here each feeding tentacle being essentially a mouth. The Sarcodina and many of the flagellates have no mouth, although in each group there are some species which take food into the cell through a particular region on the cell surface. The quantity of energy ingested and very often the feeding behaviour, are subject to modification by biological and environmental factors in all free-living Protozoa. B. Modes of Feeding (i) Protozoa with a Cytostome or Cell Mouth The cytostome is the usual form of mouth encountered among ciliates and some flagellates, but the tentacles of the suctorians are also cell mouths of a very different structure.
The fact that various species exploit different size spectra of food particles explains in part why so many ciliates are able to cohabit in protozoan communities, since they will not necessarily be exploiting the same bacteria as food. Food selection in Stentor was investigated during the early part of How Protozoa Obtain Energy 53 this century by Schaeffer (1910). From his elegant experiments Schaeffer showed that this large omnivorous ciliate exercises selection among the particles that are brought to its cytostome by the ciliary current.
The microtubules in the terminal knob bend along their longitudinal axes and splay apart at levels above the sleeve as their tips move downwards and outwards. Thus a large area of knob is extended into the prey, presumably facilitating the uptake of material. 11: A cross·section of the Shaft of a Resting Tentacle of Tokophrya. OT - outer tubules, TR - inner tubule ring, V - dense vesicles in the lumen of the tentacle. Source: Based on Tucker (1974). 12: The Terminal Portion of the Tentacle of the Suctorian Tokophrya.
Anatomie, Biologie, Physiologie. Lehrbuch und Atlas by Trebsdorf M.