Spiral Bacteria

Spiral bacteria, bacteria of spiral (helical) shape, form the third major morphological category of prokaryotes along with the rod-shaped bacilli and round cocci. The two types of spiral cells are spirillum and spirochete, with spirillum being rigid with external flagella, and spirochetes being flexible with internal flagella. This model is of a spirochetes type. https://en.wikipedia.org/wiki/Spiral_bacteria