Mycoplasma are small wall-less bacteria. Some species and others are nonmotile. M. mobile, shown here, glides at about 3 µm/s. It was isolated from the gill of a freshwater fish. The cell has a nose, like a shmoo, and it glides nose first. In a remarkable experiment, Uenoyama and Miyata (2005) have shown that detergent-lysed cells continue to glide if provided Mg++ and ATP.
Kirchhoff, H. Motility, in Mycoplasmas: Molecular Biology and Pathogenesis. American Society for Microbiology, pp. 289-306 (1992).
Uenoyama, A. and Miyata, M. Gliding ghosts of Mycoplasma mobile. Proc. Natl. Acad. Sci. USA 102, 12754-12758 (2005).