Johnston's organ

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The Johnson's organ can be seen in Drosophila. It consists of a sail like flagellum which rotates in a structure called the funiculus. This movement causes mechanical movement on the surrounding hairs resulting in a nervous signal propagating. The Johnston's organ reacts between 150-500Hz, essentially for detecting the wing beat frequency in detection of a mate.

The Johnston's organ is a collection of sensory cells found in the pedicel (the second segment) of the antennae in the Class Insecta. The Johnston's organ detects motion in the flagellum (third and typically final antennal segment). The presence of the Johnston's organ is a defining characteristic which separates the Class Insecta from the other hexapods belonging to the group Entognatha.