Any of numerous bacteria of the genus Spiroplasma that vary in form, lack flagella, and are associated with various plant diseases. These bacteria and the related mycoplasma are the only bacteria without cell walls.

• 螺原体螺原体属中许多种细菌中任一种，外形可变且缺少鞭毛，与各种植物疾病相关。这类细菌和相关的支原菌是唯一的无细胞壁的菌类