31. It is motil by a single polar flagellum . 32. Its motility is due to a polar flagellum . 33. Multiple processes were involved in the evolution of the flagellum , including horizontal gene transfer. 34. After the recognition period, it becomes irreversibly attached via the pole opposite the flagellum . 35. Recent findings indicate the parasite is unable to survive in the bloodstream without its flagellum . 36. The cells are rod-shaped and motile by means of a single polar flagellum . 37. It is a spiral-shaped bacterium with a bipolar, single, nonsheathed flagellum . 38. It is catalase-positive and rod-shaped, with a single polar flagellum . 39. The female antenna is composed of 12 segments, its flagellum broadening towards its apex. 40. Another notable feature of " Bdellovibrio " is the sheath that covers its flagellum .
