Exaggerated morphological traits, such as the mandibular tusks of mayflies, are rarely observed in immature insects, especially when such traits are exhibited by both sexes. The aim of the present study was to investigate the static allometry, sexual size dimorphism, and trade-offs (i.e. compensations) of exaggerated mandibular tusks in the larvae of Rhoenanthus coreanus (Yoon & Bae) (Ephemeroptera: Potamanthidae). As expected, sexual dimorphism was observed in size, especially in that of eyes and tusks, with males exhibiting significantly larger eyes and females exhibiting longer tusks. Tusk size was monomorphic in males, and in contrast to that reported in previous studies, the static allometry of tusks was positive in females but negative in males. A positive compensation and correlation was observed between tusk and foreleg length in both sexes, which may be related to the burrowing and feeding behavior.

中文翻译：

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穴居may中的夸张的下颌tus牙的异形体（Rephnanthus coreanus（Ephemeroptera：Potamanthidae）

在未成熟的昆虫中很少观察到夸大的形态特征，例如may的下颌牙，尤其是当两性都表现出这种特征时。本研究的目的是研究轮虫幼虫的夸张下颌牙的静态变构，性大小二态性和权衡（即补偿）。（Yoon＆Bae）（星phe：Potamanthidae）。如预期的那样，观察到性二态性的大小，特别是在眼睛和象牙的性中，男性表现出明显的大眼睛，女性表现出更长的子。象牙的大小在男性中是单态的，与以前的研究相比，象牙的静态变态法在雌性中为阳性，在雄性中为阴性。男女之间的象牙和前腿长度之间存在正向补偿和相关性，这可能与洞穴和进食行为有关。