Issus is a genus of planthoppers belonging to the family Issidae of infraorder Fulgoromorpha of suborder Auchenorrhyncha of order Hemiptera.

[2][3] The mesh sector gears do not transform velocity or torque, and they do not convey much of the power; they only synchronize the jumping motion of the hind legs, preventing yaw (rotation).

The genus Issus includes small insects generally flightless with a stocky, brown body and forewings with strong pronounced ribs.

[4]) The existence of the gears in planthoppers had been known for decades,[5] but zoologist Gregory Sutton and his co-authors only recently characterized their functional significance by doing high-speed photography of Issus coleoptratus at Cambridge University.

As a result, the legs move in almost perfect unison for a straight jump, giving the insect more connected power as the gears rotate together to their stopping point and then unlock.