Amphitrichous bacteria have a single flagellum on each of two opposite ends (only one flagellum operates at a time, allowing the bacterium to reverse course rapidly by switching which flagellum is active).
As bacterias anfitricas teñen un só flaxelo en cada un dos dous extremos opostos (un só flaxelo opera á vez, permitindo á bacteria reverter rapidamente o movemento cambiando el flagelo que está activo).