春尺蠖蛹雌雄外部形态特征快速鉴别分析

为依据春尺蠖Apocheima cinerarius Erschoff蛹的形态特征快速、无损、准确鉴别雌雄个体,对其头部、胸部、腹部和体色外部鉴别特征进行了分析,并通过解剖生殖系统验证准确性.结果表明:以春尺蠖蛹的胸部和腹部特征识别雌雄准确率明显高于头部和体色特征,识别率可达100％.首先,雌蛹第8腹节腹板前缘中部具有"Y"型沟,与第7腹节腹板后缘形成倒三角状,而雄蛹无此特征.其次,雌蛹生殖孔与产卵孔连接形成裂缝,两侧平坦无突起,而雄蛹第9腹节腹板中央有一纵裂缝的生殖孔,两侧各有半圆状瘤状突起.最后,雌蛹的胸部背板各节间相对长度均小于雄蛹,而雄蛹中胸背板最宽,其后缘明显向外凸起.因此,春尺蠖蛹胸部或腹部特征可用于快速、准确地鉴别雌雄性别.

Rapid identification and analysis of external morphological hermaphroditic characteristics of Apocheima cinerarius Erschoff pupae

In order to determine the rapid, nondestructive and accurate identification of male and female pupae of Apocheima cinerarius Erschoff pupae, external distinguishing features of head, thorax, abdomen and body colour of A. cinerarius pupae were analyzed, and the results of identification were verified by dissecting the reproductive system. The results showed that the accurate rate of distinguishing features of thorax and abdomen were obviously higher than that of head and body colour, which could reach 100%. Firstly, there was a Y-type sulcus in the middle of the 8th abdominal segment of female pupae, and the Y-type sulcus and the 7th abdominal segment trailing edge were combined to form an inverted triangle, but male pupae wasn''t this characteristic. Secondly, there was a longitudinal suture gonopore in the middle of the 9th abdominal segment of male pupae, and the gonopore had a semicircular verrucae on each side, but the gonopore was connected with the oviposition aperture to form a suture with flat on both sides. Lastly, the relative length of each segment of thorax with tergum of male pupae was wider than that of female pupae, especially mesothorax with tergum of male pupae was the widest, and that of the trailing edge protrudes sharply outward. Therefore, the characteristics of thorax and abdomen of A. cinerarius pupae can quickly and accurately identified male and female pupae.