Mating of Xenos vesparum (Rossi) (Strepsiptera, Insecta) revisited
Mating of Xenos vesparum (Rossi) (Strepsiptera, Insecta) revisited
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DOI：
10.1002/jmor.10359
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发表时间：
2005-09-01
影响因子：
1.5
通讯作者：
Dallai, R
中科院分区：
文献类型：
--
作者：
Beani, L;Giusti, F;Dallai, R
本文研究了链虫Xenos vesparum有争议的交配，探讨了可能的精子受精途径。这只雌性黄蜂是Polistes黄蜂的一种新生的永久内寄生虫，它只从宿主腹部挤出它的前部，即“头胸”。这个区域有一个开口，交配和幼虫逃逸都发生在这里。通过扫描和透射电镜观察发现，精子不仅在血管中，而且在最近交配的雌性的“腹管”（雌性特有的外阴管）和“生殖管”（连接腹管和血管的外胚层内伏）中也有精子。精子可以通过皮下授精的血腔到达卵母细胞，也可以通过沿生殖道移动到达卵母细胞，生殖道后来被一龄幼虫用来逃脱。根据行为和超微结构的证据，重新考虑皮下授精的假设。
The controversial mating of the strepsipteran Xenos vesparum was studied to investigate the possible sperm routes for fertilization. The female, which is a neotenic permanent endoparasite of Polistes wasps, extrudes only its anterior region, the "cephalothorax," from the host abdomen. This region has an opening where both mating and larval escape occur. Observations with scanning and transmission electron microscopy revealed spermatozoa not only in the hemocoel, but also in the "ventral canal" (an extragenital duct peculiar to sipteran females) and in the "genital ducts" (ectodermal invaginations connecting the ventral canal to the hemocoel) of recently mated females. Xenos vesparum spermatozoa can reach the oocytes either through the hemocoel as a result of a hypodermic insemination, or by moving along the extragenital ducts, which are later used by first instar larvae to escape. The hypothesis of hypodermic insemination is reconsidered in the light of behavioral and ultrastructural evidence.