What is a common appearance of Membracidae due to their expanded pronotum?

• A. Very bright colors
• B. Extremely long antennae
• C. They are humpbacked or thorn-like
• D. They have no wings

Answer: (C)

The feature being tested is the expanded pronotum of Membracidae, which grows out over the body and creates a silhouette that is often humpbacked or thorn-like. In treehoppers, this pronotum can take on a variety of elaborate shapes—horns, helmets, spines, or tubercles—that mimic plant parts such as thorns or other structures. This modification provides camouflage and a defense because predators may mistake the insect for a plant feature rather than prey. So, when you see a treehopper with a pronounced, humpbacked or thorn-like profile, that appearance is characteristic of the expanded pronotum. Other traits like bright colors, extremely long antennae, or a lack of wings aren’t driven by this pronotal expansion and aren’t the hallmark described here.