显突雄性成虫腹部斑纹的变化

显突 (Coenagrion barbatum Needham)雄性成虫腹部的斑纹存在很大变异。第 2腹节背面的斑纹可归为 2种类型包括 9种形式。第 8腹节背面 90 %左右的个体具黑色斑纹 ,这些斑纹可分为 3种类型包括 7种形式 ,约 10%的个体第 8腹节背面呈蓝色无黑斑纹。第 10腹节背面的黑色斑纹可归为 1类 ,但个体间又有差异。

Study on the Significant Variations in the Abdominal Spot Patterns in the Male Adult Coenagrion barbatum Needham

Significant variations in the abdominal spot patterns have been observed in the male adult Coenagrion barbatum Needham.The spot patterns on the second abdominal segment could be divided into 2 types,which include nine patterns.On the eighth segment,90% of the male individuals exhibited black spots on the dorsal surface,which form into 7 different patterns.The dorsal surface of the rest 10% was blue in color without spots.For the tenth abdominal segment,the spots were all black and could be grouped into one pattern in spite of the differences among individuals.