In the antenna sensory apparatus of bugs Coreus marginatus, Cimex lectularius, and Rhodnius prolixus sensilla of the four main types are identified: chaetica, trichodea, basiconica, and coeloconica. Chaetoid sensilla are differentiated into two subtypes: sensilla with cogged cuticles and those with smooth ones; trichoid sensilla were divided into long pointed and short ones with blunt tips. In larvae and adults of R. prolixus trichobothria (long fili- form hairs) were found on the medial side of pedicellum. The postembryonic changes in the quantitative and quali- tative composition of the antenna sensory apparatus were assessed using biometric analysis. The greatest increase of sensory organs was observed upon the nymphal ecdysis from the 5th instar to adult.
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