Science Olympiad Entomology Practice Exam

Which family is known for a large pronotum extending over the abdomen and head?

Cicadellidae Cercopidae Fulgoridae Membracidae

Correct Answer:

Membracidae

Explanation:

In treehoppers, the pronotum—the plate that covers the first thoracic segment just behind the head—becomes greatly enlarged and extends over the body, sometimes looping over the abdomen and even the head. This creates the distinctive helmet-, thorn-, or plant-mimic shapes that define Membracidae. The feature isn’t just for looks: it’s a defense and camouflage strategy, helping individuals blend with twigs and plant structures to deter predators. Other families don’t show this dramatic, helmet-like pronotum extension—the leafhoppers have a smaller, unobtrusive pronotum; spittlebugs’ pronotum isn’t extended in this way; lanternflies may have other striking features, but not the helmeted pronotum that characterizes Membracidae.

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