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首页> 外文期刊>Annals of the Entomological Society of America >Relationship Between Mandibular Asymmetry, Oviposition Hole, and Oviposition Substrate Hardness in Two Bamboo-Using Lizard Beetles Doubledaya tonkinensis and D. sinuata (Coleoptera: Erotylidae: Languriinae)
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Relationship Between Mandibular Asymmetry, Oviposition Hole, and Oviposition Substrate Hardness in Two Bamboo-Using Lizard Beetles Doubledaya tonkinensis and D. sinuata (Coleoptera: Erotylidae: Languriinae)

机译：两种使用竹的甲虫Doubledaya tonkinensis和D. sinuata的下颌不对称性，产卵孔和产卵基质硬度之间的关系（鞘翅目：Erotylidae：Languriinae）

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摘要

Mandibles and genae of adult females of most members in the genus Doubledaya (Coleoptera: Erotylidae: Languriinae) exhibit distinct left-right asymmetry, i.e., the left side of the traits is larger than the right, which may facilitate boring into hard materials for oviposition; females of D. bucculenta and D. sinuata excavate holes or relatively deep depressions with their mandibles on internodes of dead bamboos to deposit the eggs on the inner surface of internode cavities. To determine the relationship between the degrees of mandibular and genal asymmetry and hardness of oviposition substrates, we measured the mandibular length and genal width of D. tonkinensis and D. sinuata, both of which oviposit on Sinobambusa sat bamboos, and examined the structure of their oviposition holes. For D. tonkinensis, we additionally examined the features of host culms. D. tonkinensis females showed a slight degree of left-directional asymmetry in the mandibles compared to males. By contrast, D. sinuata females showed distinctly marked left-directional asymmetry in the mandibles and genae. Females of D. tonkinensis excavated soft walls of internodes of weakened, young bamboo culms, whereas D. sinuata excavated hard internode walls. Cross sections revealed that the holes of D. tonkinensis and D. sinuata were funnel-shaped, indicating that the females first excavate a cone-shaped depression in the internode using mandibles followed by ovipositor's penetrating wall from the bottom of the depression to the inner surface of the internode cavity. The results strongly suggest that the markedly asymmetric mandibles of Doubledaya females facilitate oviposition into hard substrates.
机译：Doubledaya属（鞘翅目：Erotylidae：Languriinae）中大多数成员的成年雌性的下颌骨和属表现出明显的左右不对称性，即，性状的左侧大于右侧，这可能有助于镗入硬质的产卵产卵; D. bucculenta和D. sinuata的雌性在死竹节间开凿洞或下颚较深的凹陷，将卵沉积在节间腔的内表面。为了确定下颌和属的不对称程度与产卵基质的硬度之间的关系，我们测量了D.tonkinensis和D.sinuata的下颌长度和属宽，二者均在中国竹叶竹上生卵，并检查了它们的结构。产卵孔。对于D. tonkinensis，我们还检查了寄主茎秆的特征。与雄性相比，雌性D. tonkinensis在下颌骨中显示出轻微的左向不对称性。相比之下，D。sinuata雌性在下颌骨和属中显示出明显的左向不对称性。敦煌D. tonkinensis的雌性开挖了弱化的幼竹茎节间的软壁，而中华D D. sinuata出土了坚硬的节间壁。横截面显示D. tonkinensis和D. sinuata的孔是漏斗形的，这表明雌性首先使用下颌骨在节间开挖圆锥形的凹陷，然后从凹陷的底部到内表面用产卵器的穿透壁节间腔的结果强烈表明，Doubledaya雌性的明显不对称的下颌骨易于在硬质基质中产卵。

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