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For Insects, Spiders & Their Kin
For the United States & Canada
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Fall Fund Drive


Genus Oryzaephilus

Beetle - Oryzaephilus surinamensis grain beetle - Oryzaephilus surinamensis grain beetle larva - Oryzaephilus mercator Unknown beetle - Oryzaephilus mercator Sawtoothed Grain Beetle - Oryzaephilus surinamensis Sawtoothed Grain Beetle  - Oryzaephilus surinamensis Indoor beetle - Oryzaephilus mercator Indoor beetle - Oryzaephilus mercator
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
Other Common Names
Merchant Grain Beetle (O. mercator), Saw-toothed Grain Beetle (O. surinamensis)
Explanation of Names
Oryzaephilus Ganglbauer 1899
2 spp. in our area (both adventive), 15 spp. worldwide(1); a third sp., O. acuminatus, recorded in FL in 1983 in a shipment of neem tree seeds (Azadirachta indica) from India, but has not established
2.5-3.7 mm
Adult: brown, elongate, with striated elytra; pronotum with several teeth on lateral margins, a medial ridge, and a dorsolateral ridge on each side of midline
the two major pest spp. are cosmopolitan; 9 spp., Afrotropical; the remaining four, Asian (Middle East, India)(1)
in containers or buildings where grain is stored; adult O. surinamensis cannot fly but come to lights; adults of O. mercator are strong fliers but are not attracted to light
year-round indoors or in warm climates
larvae and adults feed on damaged kernels of stored grains: barley, oats, rice, sunflower seeds, and wheat, plus flour, pasta, breakfast cereals, cake mixes, and various other processed foods
Internet References
Fact sheets: Calvin (1990)(5) | |
O. acuminatus fact sheet (McLellan 2012)(6)