Antennal sensilla of grasshoppers (Orthoptera: Acrididae) in relation to food preferences and habits |
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Authors: | Hu-Hai?Chen Yun-Xian?Zhao Email author" target="_blank">Le?KangEmail author |
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Institution: | (1) State key laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, 100080 Beijing, People’s Republic of China |
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Abstract: | The external structure, i.e. number and distribution of sensillae on male and female antennae of 12 species of grasshoppers
belonging to Pamphaginae, Catantopinae, Oedipodinae and Gomphocerinae in the grasslands of Inner Mongolia was investigated
using scanning electron microscopy. Five major types of antennal sensillae were detected - trichoid, long basiconic, short
basiconic, slender and short basiconic, and coeloconic sensillae. Total number of antennal sensillae varied among different
sexes, subfamilies, feeding groups, life forms and eco-forms. Males showed significantly more sensillae than females, due
to presence of more short basiconic and coeloconic sensillae. Species under Catantopinae showed more long basiconic sensillae
than the others. The Oedipodinae had the highest number of slender and short basiconic sensillae and coeloconic sensillae,
followed by Catantopinae and Gomphocerinae; while Pamphaginae had the fewest. The total number of sensillae showed the same
trend for these two types amongst the subfamilies as well, species which prefer habits on the ground possessed fewer antennal
sensillae than species which prefer to stay on plants. The maximal number of antennal sensillae were observed in hygrophytous
species,Chorthippus albomarginatus, in the 12 grasshopper species investigated, although the data is not statistically significant. The general trend which
emerged was that species feeding on grass possessed more antennal sensillae, particularly coeloconic sensillae, compared to
other feeding group species. |
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Keywords: | Antennal sensilla food preference grasshoppers habit |
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