Figure 1. Exceptionally long centriolar cartwheel in T. agilis .

1. Differential interference contrast micrograph of live T. agilis cell. The arrow points to the cell anterior, where the rostrum is located; arrowheads point to some of the flagella.
2. Transmission electron micrographs of T. agilis centriole embedded in resin—longitudinal view; the hub (arrowhead) is visible in the cartwheel‐bearing region (pink line), but not in the distal region (white line).
3. Transmission electron micrographs of T. agilis centriole embedded in resin in transverse view from distal end (left) and corresponding image circularized and symmetrized with the CentrioleJ plugin (middle), with schematic indicating principal architectural elements (right).