This PDF file includes:

• Supplementary Text: Comparative scale morphology
  
• fig. S1. SEM images of scales of Collembola and Archaeognatha.
  
• fig. S2. SEM images of scales of Zygentoma and Psocoptera.
  
• fig. S3. SEM images of scales of non-coelolepidan Lepidoptera.
  
• fig. S4. SEM images of scales of coelolepidan Lepidoptera.
  
• fig. S5. SEM images of scales of Culicidae.
  
• References (49–58)

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