Fig. 7 in Some Ultrastructural Features of the Planktonic Freshwater Ciliate Limnostrombidium viride (Alveolata, Ciliophora, Oligotrichida) and Improved Diagnoses of Oligotrich Taxa

Fig. 7. Hemitheca of Limnostrombidium viride in the transmission electron microscope. (A) Tangential section showing the seams (arrow) between the polygonal cortical platelets, which are covered by the layer of longitudinal microtubules. (B) Freeze-fracture replica showing the seams between the polygonal platelets, the layer of longitudinally orientated microtubules, the alveoli, and remnants of the cell membrane with its densely arranged particles (arrows). (C) Transverse section showing the perilemma with its electron-dense bodies, the alveoli, the layer of longitudinal microtubules, and the polygonal cortical platelets. The arrowhead marks the cell membrane. AL, alveoli; CP, cortical platelets; MT, cortical microtubular layer; PE, perilemma. Scale bars: 1 µm.