Study On Antennal Sensilla Of Eleven Species In Arcypteridae (Insecta: Orthoptera) With Scanning Electron Microscopy

Grasshoppers belong to Orthoptera, Acridoidea, they are important invertebrates and primary consumers, which are also one of the severely harmful agricultural pests. The classifycation and the identification of grasshoppers lay the foundation for their disaster prevention.Insects mainly through apperceive sex pheromone or volatiles to seek mate, select food and oviposition site. Antennal sensilla are important sense organ and there are lots of olfactory, sensory and auditory sensilla on the surface of antennae. Since 20th century, the research on insect antennal sensilla has made remarkable progress. There are more than 1000 species of grasshoppers in China. As to the aspect of antennal sensilla only 18 species belonging to 17 genera 6 families have been studied. The research on antennal sensilla is not only the basic theory in entomology, but also the scientific revelation in pest prevention. This is the first research on the antennal sensilla types, numbers and distribution of eleven species in Arcypteridae with scanning electron microscopy(SEM). It can offer evidence in behavioral biology, taxology and evolutionary biology of Acrididae.This research is consisted of two parts:(1) The differences of antennal sensilla types, numbers and distribution among Omocestus I.Bol, Euchorthippus Tarb. Chorthippus Fieb.(2) The differences of antennal sensilla types, numbers and distribution among O.viridulus(L), O.haemorrheidalis(Charp.). Ch.aethalinus(Zub.), Ch.changbaishanensis Liu, Ch.albonemus Cheng et Tu, Ch.minutus zhang, Ch.hsiai Cheng et Tu., Eu.zuojianus Zhang et Ren, Eu.cheui Hsia, Eu.vittatus Zheng, Eu.unicolor(Ikon.)In conclusion: Thirteen types of antennal sensilla were find in eleven species of Arcypteridae: trichoid sensilla(I, II), chaetic sensilla(I, II), basiconic sensilla(I, II, III, IV, V), coeloconic sensilla, cavity sensilla, Bohm bristles, sporangium sensilla. There were remarkable differences among different genera of same family, as well as to different species of same genus. It was concluded that the types, numbers and distribution of antennal sensilla were important characteristics in classification and identification for different genera and sibling species in Arcypteridae.