Everything about Tympanal Organ totally explained
A
Tympanal organ is a hearing organ in
insects, consisting of a membrane (
tympanum) stretched across a frame backed by an air sac. Sounds vibrate the membrane, and the vibrations are sensed by a
chordotonal organ.
Tympanal organs occur in just about any part of the insect: the
thorax, the base of the wing, the
abdomen, the legs, etc., depending on the group of insects. The structures are thought to have evolved independently many times. As a result, their position and structures are often used to help determine the taxonomy of the species. For example, all members of the
Geometridae share distinctive paired abdominal tympanal organs that open towards the front side of the first abdominal segment. Within the organ, particular structures vary in shape and are used to indicate shared ancestry of subfamilies. In other families of
Lepidoptera having abdominal tympanal organs, the opening may be in a different orientation and the structures differ in shape.
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