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Species Oryzaephilus surinamensis - Sawtoothed Grain Beetle

Clerid? - Oryzaephilus surinamensis Clerid? - Oryzaephilus surinamensis Oryzaephilus surinamensis saw-toothed grain beetle - Oryzaephilus surinamensis Oryzaephilus surinamensis Oryzaephilus surinamensis Silvanus? - Oryzaephilus surinamensis Sawtoothed Grain Beetle - Oryzaephilus surinamensis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Cucujoidea (Sap, Bark and Fungus Beetles)
No Taxon (Cucujid series)
Family Silvanidae (Silvanid Flat Bark Beetles)
Subfamily Silvaninae
Genus Oryzaephilus
Species surinamensis (Sawtoothed Grain Beetle)
Explanation of Names
Oryzaephilus surinamensis (Linnaeus 1758)

The two Oryazephilus common in the US can be distinguished by a projection or bump just behind the eye. In O. surinamensis, this area is broad and blunt, and in mercator it is narrow and more protruding.

Left: O. surinamensis, right: O. mercator.
cosmopolitan(1) (spread by trade), of unclear origin(3)
primarily, granaries, grain elevators, flour mills, but capable to survive winter in temperate climes outdoors(1); adults have not been seen in flight, but they have been collected in light traps(4)
Life Cycle
eggs laid singly or in small clusters in crevices in the food material during a 2-5 month period and hatch in 3-17 days; larva passes through 3-5 instars and makes a pupal cell attached to some solid object to pupate; typical life cycle takes 30-50 days; up to 7 generations per year; adults typically live 6-10 months (sometimes >3 years) (details in(4))
serious pest of stored grain; presence in household products is incidental and causes little concern(1); does not attack unbroken grain, but uses small lesions on the surface to gain entrance(4)
Internet References
Fact sheet (Walker YYYY)(5)
Fact sheets: MI State | OK State