Laddertongue grain beetle (Red flour beetle)
Scientific Name: Tribolium castaneum
Order & Family: Order: Coleoptera; Family: Tenebrionidae
Size: 3.0 - 4.5 mm (1/8 inch) in length

Natural Habitat
Indoor environments, particularly pantries, kitchens, grain storage facilities, and warehouses
Diet & Feeding
Scavenges on stored grain products, flour, cereal, dry pet food, nuts, and dried fruit
Behavior Patterns
Active year-round in warm indoor environments; they are nocturnal and attracted to light, often hiding in tight crevices of food packaging
Risks & Benefits
Major pantry pest that causes economic loss through food contamination; it does not bite or sting humans and is not known to spread diseases
Identified on: 1/4/2026