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Coleoptera claws and trichome interlocking.

Gianandrea Salerno1, Manuela Rebora2, Silvana Piersanti3

  • 1Dipartimento di Scienze Agrarie, Alimentari e Ambientali, University of Perugia, Borgo XX Giugno, 74, 06121, Perugia, Italy.

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Summary
This summary is machine-generated.

Specialized claws in lady beetles (Coccinellidae) help them grip flexible plant trichomes. This adaptation enhances insect attachment to plants, particularly those with soft, unbranched trichomes.

Keywords:
FrictionHairy leavesInsect attachmentLadybirdLeaf replicas

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Area of Science:

  • Entomology
  • Biomechanics
  • Plant-Insect Interactions

Background:

  • Insects interact with plants using specialized appendages.
  • Coccinellid beetles (ladybugs) possess unique claws with basal teeth.
  • Plant trichomes (hairs) vary in structure and stiffness, influencing insect attachment.

Purpose of the Study:

  • To test if specialized claws in lady beetles are adapted for interlocking with plant trichomes.
  • To compare the attachment ability of different beetle species on smooth and hairy plant surfaces.
  • To investigate the role of trichome stiffness in insect attachment.

Main Methods:

  • Traction force and centrifugal force experiments were conducted.
  • Attachment ability was measured on plants with smooth and hairy leaves (Cucurbita moschata, Prunus laurocerasus).
  • Attachment was also tested on resin replicas and glass to vary substrate stiffness.
  • Substrates were analyzed using cryo-scanning electron microscopy (cryo-SEM).

Main Results:

  • Plant trichomes can increase insect friction force and attachment compared to smooth surfaces.
  • The effectiveness of trichomes depends on their stiffness; softer trichomes are harder to grasp.
  • Specialized claws, like the dentate claws of Coccinellidae, are crucial for grasping soft trichomes.
  • Beetle species with specialized claws showed enhanced attachment to hairy substrates.

Conclusions:

  • Specialized dentate claws in Coccinellidae are an adaptation for effective attachment to flexible plant trichomes.
  • Trichome stiffness is a critical factor determining the success of insect-plant attachment.
  • This study elucidates the biomechanical basis of insect-plant adhesion in relation to specialized morphological adaptations.