Weird Cells inside termite

This is a video of Trichonympha grandis, Barbulanympha ufalula and other parabasalid flagellates living inside a cockroach gut. The surface is covered withy beating flagellae and various spirochete bacteria. The quite huge cell nucleus is shown together with two rows of basal bodies/ and centrioles on each side of the cell. The anatomy of these organisms gives clues to the understanding of how eukaryotic cells arose through serial endosymbiosis.