Functional morphology of Trichadenotecnum male and female genitalia analyzed using μCT (Insecta: Psocodea: Psocomorpha)
Functional morphology of Trichadenotecnum male and female genitalia analyzed using μCT (Insecta: Psocodea: Psocomorpha)
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DOI：
10.1002/jmor.20965
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发表时间：
2019-04-01
影响因子：
1.5
通讯作者：
Yoshizawa, Kazunori
中科院分区：
文献类型：
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作者：
Cheng, Zixin;Yoshizawa, Kazunori
尽管之前的研究已经描述了树虱属的巨大生殖器多样性，但生殖器结构在交配过程中的具体功能受到的研究较少。我们重建了交配中的 Trichadenotecnum incognitum 的雄性和雌性生殖器以及未交配的假中 Trichadenotecnum 的雄性和雌性生殖器的每个结构的 3D 模型。通过比较交配和非交配状态下雄性和雌性生殖器结构及相关肌肉的变化，可以描述各生殖器结构的功能。交配过程中，我们发现雌性下生殖板通过雄性腹肛上的远端突钩入雄性体内，并被雄性上肛、下腺和阴茎体固定。此外，紧密接触的结构，即带刺的雄性下腺和雌性精孔板周围的增厚膜，表明有性共同进化。这些结果不仅让我们对三甲藻的交配过程有了新的认识，也解释了该属生殖器结构如此多样化的原因。
Although the great genital diversity of the barklouse genus Trichadenotecnum has been described in previous studies, the specific function of the genital structures during the copulation process has received less investigative attention. We reconstructed 3D-models of each structure of the male and female genitalia of Trichadenotecnum incognitum in copula and those of uncopulated male and female of Trichadenotecnum pseudomedium. By comparing the changes in male and female genital structures and related muscles in copulated and uncopulated states, the function of each genital structure can be described. During the copulation, we found that the female subgenital plate was hooked into the male body by the distal process on the male paraproct and was fixed by the male epiproct, hypandrium and phallosome. In addition, sexual coevolution was suggested by tightly contacting structures, that is, thorny male hypandrium and thickened membrane around the female spermapore plate. These results not only give us a new understanding copulation process of Trichadenotecnum, but also explain the reasons why genital structures are so divers in the genus.