Preliminary notes on the external proprioceptor organs of Cicadomorpha

The hair sensilla and the campaniform sensilla, grouped together in well definite sensorial areas in 12 species of Cicadomorpha (Insecta Hemiptera), are investigated. We reported 31 external proprioceptor organs (EPO), 17 with hair sensilla and 14 with campaniform sensilla. In Cicadomorpha only 5 of the 31 EPOs (16.1%) are conserved in all examined species: two organs with hair sensilla on the legs and three organs with campaniform sensilla (two on the legs and one at the base of the hindwings). Often the EPOs are reduced and in some taxa (species, genera or family) the degree of the reduction led to the disappearance of the organ.