论文部分内容阅读
当截获的小蠹虫数量很少时,不允许用解剖虫体的方法识别雌雄。笔者的经验是通过观察小蠹腹未第7、第8腹节背板的大小、形状可以区别雌雄虫体。小蠹虫背板8节,雄性小蠹虫的生殖器着生在第8背板下,故该节背板大而明显,骨化程度高;雌性生殖器退化,只有一小受精囊,故该节背板比雄性小而不明显,骨化程度底,往往覆盖于第7背板下或稍露出。不过,因属种不同,腹末背板变化较大,要靠长期积累经验才能掌握。生活的小蠹虫腹末往往缩在鞘翅底下,不易观察,可用下述方法使其外露:(1)将正在排粪或交配的小蠹虫及时用乙醚麻醉后投入浸泡液浸泡。(2)将活虫直接投入水中,慢慢加热至腹部稍下垂。(3)用镊子夹住浸泡24小时以上的虫体鞘翅后端,在镜下慢慢将腹末挤出,及时观察。
When the number of beetles caught interception is small, the method of dissecting parasites is not allowed to identify both sexes. The author’s experience is that by observing the undeveloped pheasant belly seventh, the size of the back section of the eighth abdominal section, the shape can distinguish between male and female body. Bark beetle back 8, male Bark beetle genitalia living in the eighth back, so the section back large and obvious, a high degree of ossification; female genital degradation, only a small seminal vesicle, so the section back Less obvious than males, the degree of ossification at the end, often covered in the seventh back or slightly exposed. However, due to different species, abdomen back plate larger changes, rely on long-term accumulation of experience to master. Live beetles tendon abdomen tend to shrink under the coleoptile, not easy to observe, the following methods can be used to make it exposed: (1) the defecation or mating beetles in a timely manner after anesthesia with ether immersion immersion. (2) The live insects directly into the water, slowly heated until the abdomen slightly sagging. (3) with tweezers sandwiched soaked for 24 hours or more elytra lacoste end, slowly under the microscope will be out of the abdomen, timely observation.