Ferrigenium kumadai gen. nov., sp. nov., a microaerophilic iron-oxidizing bacterium isolated from a paddy field soil.

An iron-oxidizing bacterium, designated strain An22, which was isolated from a paddy field soil in Anjo, Japan, was described taxonomically. Strain An22 was motile by a single polar flagellum, curved-rod, Gram-negative bacterium that was able to grow at 12-37 °C (optimally at 25-30 °C) and at pH 5.2-6.