Eurymela fenestrata, widely known as the common jassid[3] and sometimes as the large gum treehopper, is a species of leafhopper found throughout mainland Australia.

The body shape has been compared to a bison, and is robust and wedge-shaped, broad at the front and bluntly tapering at the back.

The wide prothorax is red and the abdomen brown and deep violet, with several white patches on the wings.

Like other leafhoppers, the common jassid sucks sap from plants, in this case, various species of Eucalyptus.

[4] The sap is a watery fluid and large quantities need to be ingested for the insects to obtain all the nutrients they need.