. Electron-microscopic structure of protozoa. Protozoa; Electron microscopy. PHYTOFLAGELLATES 133 The external morphology of flagella among the phytoflagellates is highly variable and would seem to be the result of opportunistic development in each group of mechanisms to increase efficiency. Internally, the morphology of the flagellar apparatus is fairly consistent throughout the phytoflagellates; the occurrence of accessory fibers leading from the kinetosome, in the form of either tubular filaments or striated roots, is widespread if not universal and foreshadows the much more complex develop
. Electron-microscopic structure of protozoa. Protozoa; Electron microscopy. PHYTOFLAGELLATES 133 The external morphology of flagella among the phytoflagellates is highly variable and would seem to be the result of opportunistic development in each group of mechanisms to increase efficiency. Internally, the morphology of the flagellar apparatus is fairly consistent throughout the phytoflagellates; the occurrence of accessory fibers leading from the kinetosome, in the form of either tubular filaments or striated roots, is widespread if not universal and foreshadows the much more complex development of such patterns in zooflagellates and ciliates. The existence of true rhizoplasts is confirmed in both phytomonads and chrysomonads, and their behavior in dividing cells needs to be analyzed. Polariza- tion of the cell is conspicuously related to the location of the kinetosome in all flagellates, and extends to organelles with no obvious role in locomotor activities. Phagotrophy occurs in probably all phytoflagellate groups, but no new information on the structures involved is available except for the highly specialized mouth of Peranema. Many phyto- flagellates are markedly ameboid, some chrysomonads producing fine filose as well as lobose pseudopodia; no observations of these have been reported. Except in the euglenoids, cell membranes are Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pitelka, Dorothy R. (Dorothy Riggs), 1920-. Oxford, New York, Pergamon Press; [distributed in the Western Hemisphere by Macmillan, New York]
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