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<p>The morphological characteristics of the prothoracic depressions in adult oak ambrosia beetles, <i>Platypus koryoensis</i> (Murayama) (Coleoptera: Curculionidae: Platypodinae), were investigated using electron microscopy and energy-dispersive X-ray spectroscopy. The depressions were categorized into three types based on their diameter: (i) small cavities, (ii) large cavities, and (iii) mycangia. Females exhibited all three types of depressions: (i) small cavities (10.04&#xa0;μm), (ii) large cavities (13.21&#xa0;μm), and (iii) mycangia (62.81&#xa0;μm). In contrast, males possessed only two types: (i) small cavities (11.12&#xa0;μm) and (ii) large cavities (15.88&#xa0;μm). The prothoracic depressions were characterized by (i) cavity-filling masses containing filamentous fungi and yeasts and (ii) an inner process or sensillum on the depression sidewall. Overall, females had a greater number of depressions than males. A novel sawtooth morphology in the inner processes was observed in female mycangia, whereas smooth-margin inner processes were noted in the large cavities of males. Furthermore, crystals found in the cavities of males primarily consisted of calcium, silicon, and potassium, possibly derived from the penetration of oak stems. These findings provide a morphological basis for a deeper understanding of the symbiotic relationship between <i>Platypus</i> species and their ambrosia fungi.</p>

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Morphological characteristics and sexual dimorphism in the prothoracic depressions of the oak ambrosia beetle Platypus koryoensis (Coleoptera: Curculionidae: Platypodinae)

  • 期刊论文

  • 发表日期：

    2025年9月22日

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  • Eun Jung Ahn,
  • Hyojun Ahn,
  • Gun-Hyung Kwon,
  • Ki Woo Kim

摘要

The morphological characteristics of the prothoracic depressions in adult oak ambrosia beetles, Platypus koryoensis (Murayama) (Coleoptera: Curculionidae: Platypodinae), were investigated using electron microscopy and energy-dispersive X-ray spectroscopy. The depressions were categorized into three types based on their diameter: (i) small cavities, (ii) large cavities, and (iii) mycangia. Females exhibited all three types of depressions: (i) small cavities (10.04 μm), (ii) large cavities (13.21 μm), and (iii) mycangia (62.81 μm). In contrast, males possessed only two types: (i) small cavities (11.12 μm) and (ii) large cavities (15.88 μm). The prothoracic depressions were characterized by (i) cavity-filling masses containing filamentous fungi and yeasts and (ii) an inner process or sensillum on the depression sidewall. Overall, females had a greater number of depressions than males. A novel sawtooth morphology in the inner processes was observed in female mycangia, whereas smooth-margin inner processes were noted in the large cavities of males. Furthermore, crystals found in the cavities of males primarily consisted of calcium, silicon, and potassium, possibly derived from the penetration of oak stems. These findings provide a morphological basis for a deeper understanding of the symbiotic relationship between Platypus species and their ambrosia fungi.