Johnston's organ

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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.

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