Desert Spider Beetle vs Western Firefly

Side-by-side species comparison

Attribute Desert Spider Beetle Western Firefly
Scientific Name Cysteodemus armatus Microphotus angustus
Order Coleoptera Coleoptera
Family Meloidae Lampyridae
Size 10-16 mm 8-12 mm
Habitat Deserts & Drylands Deserts & Drylands
Diet Herbivores Omnivores
Regions North America North America
Conservation Least Concern Data Deficient

Desert Spider Beetle

A bizarre inflated blister beetle with a bulbous, metallic blue-black abdomen. It waddles slowly through the Mojave and Sonoran deserts.

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Did You Know?

Its balloon-like body shape mimics a spider, which may deter some predators.

Western Firefly

A rare western North American firefly with larviform females that glow. Males are winged but produce no light.

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Did You Know?

It is one of very few firefly species found west of the Rocky Mountains, where most people believe fireflies do not exist.