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Image #   25520C
Name:   Wing hooks - yellow jacket wasp (Vespula pensylvanica)
Copyright:   Copyright 2007 Dennis Kunkel Microscopy, Inc.
Description:   Caption: Wing hooks - yellow jacket wasp (Vespula pensylvanica). Yellow jacket wasps are members of the order Hymenoptera (meaning membranous wings). Yellow jackets have four wings, but they often are thought to have just two because a hook apparatus attaches the small rear wings to the forewings, making them appear as one. These hooks, called hamuli, appear in a row on the rear wing and catch on to a ridge on the lower margin of the forewing. Hamuli are characteristic of advanced insects and are an adaptation that ensures well-controlled, rapid flight. The number of hamuli per millimeter of wing length is characteristic of insect caste. Wings of workers have more numerous hamuli, which corresponds with specialization for foraging or carrying loads in flight. Hamuli allow both wings operate in unison to form a single aerodynamic surface.
Magnification*: x70
Type: SEM
    *(Magnifications are based on a 35mm slide image of 24mm in the narrow dimension.)
Keywords:   insects insect yellow jacket wasp yellow jacket wasp wing wing hook wing hooks flying insect human pest invertebrate invertebrates stinging insect Vespula pensylvanica western yellow-jacket western yellow jacket western yellowjacket yellow-jacket yellowjacket yellowjacket wasp hamuli rapid flight aerodynamic surface hook insect predator 03.01.07 25520C

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