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FIGURE 4.2 Electron micrographs showing convergent ultrastructural features in some euglenozoans (AE) and dinoflagellates (FJ). (A) Scanning electron micrograph (SEM) of a benthic euglenid (Ploeotia) showing a dorsoventrally compressed cell with broad longitudinallyarranged pellicle strips. (B) Transmission electron micrograph (TEM) through the nucleus of a euglenid cell (Phacus) showing a large nucleolus (asterisk) and permanently condensed chromosomes (arrows). (C) TEM through the cell surface or pellicle of a euglenid cell showing the proteinaceous strips (asterisk) beneath the plasma membrane (arrow). (D) TEM through the cell surface of a euglenid cell (Peranema) showing mucocysts (arrows). (E) TEM through a euglenophyte cell (Euglena) showing chloroplasts with thylacoids in stacks of 3 (stack between the arrows). (F) SEM of a benthic dinoflagellate (Prorocentrum) showing a dorsoventrally compressed cell with broad thecal plates. (G) TEM through the nucleus of a dinoflagellate cell (Apicoporus) showing a large nucleolus (asterisk) and permanently condensed chromosomes (arrows). (H) TEM through the cell surface of a dinoflagellate cell (Apicoporus) showing the proteinaceous dinoflagellate pellicle (asterisk) that sits beneath the alveoli and plasma membrane (both missing in this preparation). (I) TEM through the cell surface of a dinoflagellate cell (Polykrikos) showing trichocysts (arrows). (Inset) TEM showing a cross section through a trichocyst of Polykrikos. (J) TEM through a dinoflagellate cell (Apicoporus) showing chloroplasts with thylacoids in stacks of 3 (stack between the arrows). (Scale bars: A and F, 10 ¼m; B and G, 1 ¼m; C, H, and J, 0.3 ¼m; D, E, and I, and 0.5 ¼m.)

FIGURE 4.2 Electron micrographs showing convergent ultrastructural features in some euglenozoans (A–E) and dinoflagellates (F–J). (A) Scanning electron micrograph (SEM) of a benthic euglenid (Ploeotia) showing a dorsoventrally compressed cell with broad longitudinallyarranged pellicle strips. (B) Transmission electron micrograph (TEM) through the nucleus of a euglenid cell (Phacus) showing a large nucleolus (asterisk) and permanently condensed chromosomes (arrows). (C) TEM through the cell surface or pellicle of a euglenid cell showing the proteinaceous strips (asterisk) beneath the plasma membrane (arrow). (D) TEM through the cell surface of a euglenid cell (Peranema) showing mucocysts (arrows). (E) TEM through a euglenophyte cell (Euglena) showing chloroplasts with thylacoids in stacks of 3 (stack between the arrows). (F) SEM of a benthic dinoflagellate (Prorocentrum) showing a dorsoventrally compressed cell with broad thecal plates. (G) TEM through the nucleus of a dinoflagellate cell (Apicoporus) showing a large nucleolus (asterisk) and permanently condensed chromosomes (arrows). (H) TEM through the cell surface of a dinoflagellate cell (Apicoporus) showing the proteinaceous “dinoflagellate pellicle” (asterisk) that sits beneath the alveoli and plasma membrane (both missing in this preparation). (I) TEM through the cell surface of a dinoflagellate cell (Polykrikos) showing trichocysts (arrows). (Inset) TEM showing a cross section through a trichocyst of Polykrikos. (J) TEM through a dinoflagellate cell (Apicoporus) showing chloroplasts with thylacoids in stacks of 3 (stack between the arrows). (Scale bars: A and F, 10 μm; B and G, 1 μm; C, H, and J, 0.3 μm; D, E, and I, and 0.5 μm.)



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