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Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

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Species Oryzaephilus surinamensis - Sawtoothed Grain Beetle

Clerid? - Oryzaephilus surinamensis tiny cereal beetle - Oryzaephilus surinamensis Oryzaephilus surinamensis Oryzaephilus surinamensis Beetle - Oryzaephilus surinamensis Oryzaephilus surinamensis Silvanus? - Oryzaephilus surinamensis Oryzaephilus surinamensis
Classification
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)
Identification
see(1)(2)

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.
Range
cosmopolitan(1) (spread by trade), of unclear origin(3)
Habitat
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))
Remarks
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