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Scale Structure and Reflectance Activity of Metapocyrtus apoensis with Notes on Its Distribution in Mindanao the Philippines

机译:菲律宾思维思义思维分布札记的规模结构与反射活动

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摘要

Scale structure and reflectance activity of a Mindanao endemic weevil from the genus Metapocyrtus has been studied for the first time. Specimens of Metapocyrtus apoensis Schultze, 1925 were collected through opportunistic sampling in Mount Calayo, Musuan, Mindanao, Philippines last February 2020. A total of three individuals of the species were collected all in lower dipterocarp forest with elevation of 500 masl–600 masl. Three specimens were then examined under Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM_EDX) to analyse its scale structures and reflectance activity. The study provides new locality record of the Mindanao endemic species first in Bukidnon region and an updated distribution in Mindanao based on recent published articles and museum collections. The species inhabits wide ranges of habitat types that greatly differ in elevation and vegetation. Examination of scale’s structure through SEM revealed that M. apoensis scales are 50 μm–70 μm in diameter which are almost circular in shape, slightly convex with rough like surface which is termed as non-ordered nipple-like structure. The scales’ shape and surface structure clearly differ from other genera of curculionids based on published articles. Analysis of the particles on the weevil’s elytra done by EDX reveals several elements that contribute to its iridescence. Major elements such as carbon (42.3%), oxygen (27.7%) and nitrogen (15.1%) come in relatively high atomic concentrations. Microspectrometer revealed a peak reflectance wavelength of about 569.7 nm. This explains the yellow-green iridescence observed on the dorsal side of the weevil. The concentration of the scale in pits serves for protection, intraspecific recognition and camouflage. Despite of widespread distribution and high abundance of this species in Mindanao, anthropogenic disturbances such as agricultural activities are on-going which extend towards their microhabitat. Monitoring to its population is recommended as the species is restricted only in Mindanao.
机译:第一次研究了来自Metapocyrtus属的肉心态特有象鼻虫的规模结构和反射率活动。 1925年,1925年Metapocyrtus apooNsis Schultze的标本通过机会主义的抽样来通过Mount Calayo,Mindanao,Mickanao,菲律宾去年2月来收集。在较低的Dipterocarp森林中,共收集了三个物种中的三种物种,提升了500 MasL-600 MasL。然后在扫描电子显微镜下检查三种标本,通过能量分散X射线(SEM_EDX)来分析其规模结构和反射率活性。该研究提供了新义义目物种首先在Bukidnon Region的新地区记录,并根据最近发表的文章和博物馆收藏品进行了Mindanao的更新分发。物种居住在栖息地各种各样的范围内,高度和植被大大差异。通过SEM检查规模的结构显示,M. apoensis鳞片的直径为50μm-70μm,其几乎是圆形的,粗糙的表面略微凸起,粗糙的表面被称为无序乳头状结构。基于已发表的物品,鳞片的形状和表面结构明显不同于其他金属丁基。 EDX完成的象鼻虫鞘翅上的粒子分析揭示了有助于其彩虹色的几个元素。碳(42.3%),氧(27.7%)和氮(15.1%)等主要元素以相对高的原子浓度。 MicroTectrometer透露峰值反射波长约为569.7nm。这解释了在象鼻虫的背侧观察到的黄绿色彩虹色。凹坑中规模的浓度用于保护,有内识别和伪装。尽管在思维义义义上广泛分布和高丰富的这种物种,但农业活动的人为紊乱正在朝向他们的微巢率延伸。由于物种仅限于Mindanao,因此建议监测其人口。

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