Definition: organs in insects that are involved in the perception of sound; just below the knee in the tibia of all legs in most insects. Reception is performed by aggregations of scolopidia, the unit mechanoreceptor in invertebrates.
Definition: A light sensing organ composed of multiple ommatidia, visual units consisting of a limited number of rhabdomeric photoreceptor cells, cornea-secreting epithelial cells, interommatidial pigment cells, and sometimes crystalline cone cells
