Relationship Between Mandibular Asymmetry, Oviposition Hole, and Oviposition Substrate Hardness in Two Bamboo-Using Lizard Beetles Doubledaya tonkinensis and D. sinuata (Coleoptera: Erotylidae: Languriinae)
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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DOI：
10.1093/aesa/saw050
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发表时间：
2016-07
影响因子：
2.3
通讯作者：
Wataru Toki;H. Pham;K. Togashi
中科院分区：
文献类型：
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作者：
Wataru Toki;H. Pham;K. Togashi
摘要双齿叶蝉属（鞘翅目：叶蝉科：叶蝉亚科）大部分成虫的下颌骨和颏部具有明显的左右不对称性，左侧大于右侧，这可能有利于钻硬材料产卵; bucculenta和D.竹卵存款在死竹的节间，用下颚在节间挖洞或较深的凹陷，使卵沉积在节间空腔的内表面。为探讨产卵基质硬度与下颌和颊侧不对称程度的关系，对中华绒螯蟹的下颌长和颊宽进行了测量。tonkinensis和D. sinuata的产卵孔结构进行了研究。对于D. tonkinensis，我们还研究了寄主秆的特征。D.与雄性相比，东京雌鱼的下颌骨显示出轻微程度的左向不对称。与此相反，D. sinuata雌性在下颌骨和颏部显示出明显的左向不对称。雌性D. tonkinensis挖去了脆弱的幼竹秆节间的软壁，而D. sinuata挖掘硬节间壁。横截面显示D. tonkinensis和D. sinuata是漏斗形的，表明雌虫先用下颚在节间挖一个锥形的凹陷，然后用产卵器的穿透壁从凹陷的底部到节间腔的内表面。这些结果表明，双翅目雌性的显著不对称的下颚有利于产卵到坚硬的基质中。
Abstract 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.