Transmission electron micrographs (TEM) of non-consecutive serial sections of Bihospites bacati n. gen. et sp. through the vestibular region of the cell. A. TEM showing the nucleus (N) with condensed chromatin, the dorsal side of the C-shaped rod apparatus consisting of the main rod (r) and the accessory rod (ar), and the vestibulum (vt). Several rod-shaped bacteria (black arrows) and spherical-shaped bacteria line inner surface of the vestibulum (vt) (bar = 10 μm). B. High magnification view of the C-shaped rod apparatus in Figure A showing the single row of microtubules (arrowheads) positioned at the junction between the tightly connected rod and accessory rod. Granular bodies (arrows) are present between the parallel lamellae that form the main rod (bar = 500 nm). C, D. Transverse TEMs showing the cytostomal funnel (cyt) and two separate lobes of the feeding pocket (arrowheads). Bacterial profiles can be seen inside the feeding pocket (arrows). Figure D uses color to distinguish between the feeding pocket (red), the vestibulum (blue), and the two branches of the flagellar pocket (green). E, F. Transverse TEMs at a more posterior level than in Figure C-D showing the posterior end of the main C-shaped rod (arrow) emerging within the posterior end of the feeding pocket. The cytostomal funnel (arrowheads) opens and fuses with the feeding pocket. Figure F uses color to distinguish between the feeding pocket (red), the vestibulum (blue), and the two branches of the flagellar pocket (green). (C-F bar = 2 μm).