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Scanning electron micrograph (SEM) of Horned treehopper (Campylenchiasp.). The genus Campylenchia is known as the horned treehopper in the family Membracidae. Treehoppers are also called thorn bugs and are closely related to cicadas and leafhoppers. They are found throughout the world except Antarctica. Treehoppers pierce plant stems with their beaks and feed upon sap and water. They have a unique pronotum (helmet) that resembles a thorn to aid in camouflage. Magnification: x3. 5 when shortest axis printed at 25 millimetres. (KEYSTONE/SCIENCE PHOTO LIBRARY/DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY)