Diagram of the cell (A), the flagellar apparatus (B) and the feeding apparatus (C) of Calkinsia aureus based on serial TEM sections. A. Illustration of the cell viewed from the left side; arrow marks the extrusomal pocket. Boxes B and C indicate the plane of view shown in Figures B and C, respectively. B. Illustration of the flagellar apparatus as viewed from left side. C. Illustration of the feeding apparatus as viewed from anterior-ventral side. The double arrowhead marks the striated fiber along the feeding pocket (FdP). Note DL, IF, IL, LF, LMt, and RF are not shown on this diagram for clarity.