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< Leonid I. Frantsevich >


Leonid Frantsevich, Aihong Ji, Zhendong Dai, Jintong Wang, Ludmila Frantsevich, Stanislav Gorb

Adhesive properties of the arolium of a lantern-fly, Lycorma delicatula (Auchenorrhyncha, Fulgoridae)

Journal of Insect Physiology 2008, 54: 818Ц 827.

Abstract. The arolium in Lycorma delicatula is shaped as a truncated pyramid, tapering proximally. The base or the terminal area is corrugated, forming parasagittal wrinkles (period 1.5Ц5.0 mm), which are supported from inside by cuticular dendrites. Side faces of the arolium are made up of sclerotized dorsolateral plates. When claws slip on a smooth substrate and pronate, the dorsolateral plates diverge and expand the sticky terminal area. The real contact area with the glass plate was recognized by light reflection on its periphery. This area was measured and shown to be smaller when the leg was pressed perpendicularly to the substrate (0.02 mm^2) than when it was sheared in a direction parallel to the substrate (0.05 mm^2). Attachment forces were measured with the aid of dynamometric platforms during pulling of active insects from horizontal or vertical glass surfaces. Normal adhesive force (about 9Ц12 mN) was much less than friction force during sliding with velocity of 6Ц17 mm/s (50Ц100 mN); however, when expressed in tenacity per unit contact area the difference was less pronounced: 170 and 375Ц625 mN/mm^2, respectively. Sliding of the arolium during shear displacement was shown to be oscillatory in frame-by-frame video analysis. Relaxative oscillations consisted of periodical sticks-slips of the arolium along the glass surface.


Videos (in AVI format)

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Measurement of the adhesion force (the normal component) with a force platform. Measurement of the friction (the tangential component, ten times stronger) with a balance.

Stick-slips of the arolium on the glass surface in Lycorma delicatula.
View the film as a whole and afterwards frame by frame.
Sliding of the leg occurs at each third frame

Stick-slips of the arolium on the glass surface in Lycorma delicatula. View the film at a normal frame rate and afterwards frame by frame or the slow version in the next window. Sliding of the leg occurs at each third frame. Stick-slips of the arolium on the glass Ц frame by frame.
The lantern fly firmly holds a hairy bottom surface of a Magnolia grandiflora leaf with the claws. The lantern fly is unable to adhere to the waxy top surface of the leaf.

 

Collection of films:

Courtship dances in a fly, Lispe spp.


Stick friction in a lantern fly, Lycorma delicatula


Arolium of a hornet, Vespa crabro


Indirect closing of elytra in a cockchafer, Melolontha


Righting kinematics in beetles (Insecta: Coleoptera)


Leg coordination during turning on an extremely narrow substrate in a bug, Mesocerus marginatus (Heteroptera, Coreidae)


Swimming in the Diving Wasp Prestwichia aquatica (Hymenoptera: Trichogrammatidae)


Kinematics of elytra in beetles


Indirect closing of elytra in various beetles


Double rotation of the opening (closing) elytra in beetles (Coleoptera)


Actuation and performance of the elytron-to-body articulation in a diving beetle

     

I. I. Schmalhausen Institute of Zoology, 2004-2009