Red flour beetle

Definition

A small, reddish-brown tenebrionid beetle, Tribolium castaneum, and a cosmopolitan pest of stored grain, flour, and milled cereals. Along with the confused flour beetle (Tribolium confusum), it is a primary model organism for studies of population genetics, sexual selection, and the evolution of social behavior in insects.

Etymology

From the characteristic reddish coloration and association with infested flour and grain products.

Example

Laboratory populations of the red flour beetle are used to study how males with enlarged mandibles in Gnatocerus cornutus—another tenebrionid pest—differ in fighting success and sperm competition compared to T. castaneum, which lacks such weaponry.

Synonyms

• Tribolium castaneum

Related Terms

• confused flour beetle
• Stored-product pest
• Tenebrionidae
• Gnatocerus cornutus
• Tribolium confusum
• Model organism

Usage Notes

Often confused with the morphologically similar confused flour beetle (Tribolium confusum); accurate identification requires examination of antennal club shape and eye separation. The two species overlap broadly in distribution and pest status but differ subtly in temperature tolerance and behavior. In research contexts, 'Tribolium' alone usually refers to T. castaneum unless specified otherwise.