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Upcoming Events

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

National Moth Week was July 23-31, 2022! See moth submissions.

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Previous events


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
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