Fire-colored beetles

Definition

A family of soft-bodied beetles (Pyrochroidae) characterized by bright red, orange, or yellow coloration in adults, often with contrasting dark markings. Adults frequent flowers and decaying wood; larvae are predatory or feed on fungal mycelia in rotting logs. The vivid aposematic coloration of many species advertises chemical defenses derived from cantharidin sequestered from prey or synthesized de novo.

Etymology

From Greek pyro- (fire) + -chroid (colored), referring to the flame-like red and orange hues typical of adults.

Example

The soldier beetle Chauliognathus marginatus (family Cantharidae) is frequently mistaken for pyrochroids; true fire-colored beetles such as Pyrochroa coccinea have more elongate bodies and filiform antennae, and their larvae hunt under bark rather than in soil.

Synonyms

• Pyrochroidae

Related Terms

• Cantharidae
• aposematic coloration
• Elytra
• Coleoptera
• Soldier beetles
• Cantharidin
• mycophagy

Usage Notes

The common name applies specifically to family Pyrochroidae, not to all red-colored beetles. Some regional usage extends 'fire-colored' to certain Cantharidae (soldier beetles), but specialists restrict the term to Pyrochroidae. Distinguish from 'fireflies' (Lampyridae, family-level luminescence) and 'fire beetles' (various Melanophila and other buprestids associated with burned forests). Larval ecology separates pyrochroids from superficially similar families: Pyrochroidae larvae are confined to decaying hardwoods, whereas Cantharidae larvae are more generalist ground predators.