Comparison of male external genitalia of nine grasshoppers in the pasture at the northern foot of the Qilian Mountains
To identify common grasshopper species in the pasture of the northern foot of the Qilian Mountains,this study used traditional anatomical methods to obtain the male external genitalia of nine species:Oedaleus decorus asiaticus,Myrmeleotettix palpalis,Sphingonotus ningsianus,Bryodemella holdereri,Filchnerella qilianshanensis,Filchnerella sunanensis,Chorthippus intermedius,Chorthippus hammarstroemi and Chorthippus fallax. The morphological characteristics of their male external genita-lia were described,and seven indicators were selected for principal component analysis. The results showed that the differences in the male external genitalia were the overall shape of the basal dorsal part of the penis,the convexity of the lateral plate edge,and the shape of the posterior process. The results of principal component analysis revealed two component factors with eigenvalues greater than 1.00. The first principal component included the lateral distance of the ancorae,the distance between two ancorae,the measured distance within the ancorae,and the lateral distance of posterior process. The second princi-pal component was bridge width. The total contribution rate of these two components was 88.14％. In con-clusion,the main characteristics of male external genitalia in grasshoppers are the relative positions of an-chor-shaped process,posterior process,coronoid process,and bridge width,in that order. Therefore,these characteristics can be used as the basis for studying the relationship and classification of the nine locust species in the pasture of the northern foot of the Qilian Mountains.
万方数据
维普
