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首页> 外文期刊>Zoological Science >Mating Behavior and the Function of the Male Genital Spine in the Ground Beetle Carabus clathratus
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Mating Behavior and the Function of the Male Genital Spine in the Ground Beetle Carabus clathratus

机译：地面甲虫Carabus clathratus的生殖行为和雄性生殖脊柱的功能

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摘要

The morphologies of male genitalia often appear harmful or aggressive, as if they may inflict physical damage upon females during copulation. Such male genitalia are often thought to function in intra-and intersexual interactions during mating. In the carabid genus Carabus, division Spinulati, males possess a spine (spinula) on the intromittent organ, of which function is unknown. To reveal the function of the spinula, we studied the mating behavior and genital coupling of a Spinulati species, Carabus (Limnocarabus) clathratus. The males positioned the spinula along the inner wall of the vaginal opening throughout copulation. This placement created a small dent and subsequently a melanized patch (wound) on the vaginal wall, but the spinula rarely penetrated the vaginal wall. The spinula did not reach the innermost part of the vagina where the spermatophore is deposited. These results suggest that the spinula is not used for inflicting damage on female genitalia or manipulating spermatophores of rival males. During spermatophore formation, the male partially withdrew the aedeagus, and only the aedeagal tip and endophallus remained within the female. By placing the spinula against the vaginal wall, the male could hold the endophallus within the vaginal chamber in the unstable copulatory posture. Thus, our observations suggest that the spinula primarily functions as an "anchor" to maintain the coupling of the male and female genitalia and thereby ensure insemination.
机译：男性生殖器的形态通常表现为有害或侵略性的，好像它们可能在交配时对女性造成身体伤害。通常认为这样的男性生殖器在交配期间在内部和性交中起作用。在棘足类Carabus属Spinulati属中，雄性在直立器官上具有脊柱（棘），其功能尚不清楚。为了揭示棘突的功能，我们研究了棘突棘物种Carabus（Limnocarabus）clathratus的交配行为和生殖器耦合。在整个交配过程中，雄性沿着阴道开口的内壁放置棘突。这种放置会在阴道壁上产生一个小凹痕，并在其后形成黑色的斑块（伤口），但脊柱很少穿透阴道壁。脊柱未到达精子沉积所在的阴道最内部。这些结果表明，脊柱不用于对女性生殖器造成损害或操纵男性对立的精原细胞。在精子形成过程中，雄性部分撤出了edeagus，而雌性中仅保留了edegalal尖端和endophallus。通过将脊柱抵靠阴道壁放置，雄性可以以不稳定的交配姿势将内窥镜保持在阴道室内。因此，我们的观察结果表明，脊柱主要起“锚”的作用，以维持男性和女性生殖器的耦合，从而确保授精。

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