Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Arrhenodes minutus - Oak Timberworm

Oak Timberworm - Arrhenodes minutus - male Oak Timberworm Beetle - Arrhenodes minutus - female Oak Timberworm Arrhenodes minutus   - Arrhenodes minutus - male Oak Timberworm - Arrhenodes minutus - female Oak Timberworm - Arrhenodes minutus - female Oak Timberworm - Arrhenodes minutus - female
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 Curculionoidea (Snout and Bark Beetles)
Family Brentidae (Primitive Weevils)
Subfamily Brentinae
Genus Arrhenodes
Species minutus (Oak Timberworm)
Synonyms and other taxonomic changes
Arrhenodes minutus (Drury)
Orig. Comb: Curculio minuta Drury 1770
♀7-14 mm, ♂7-22 mm(1)
Sexually dimorphic: snout is broad in males, long & narrow in females (see discussio)
Great Plains, east (NS-FL to ON-SD-TX)(2)(3)(4)(BG data)
Deciduous forests, under bark (esp. of oaks)(2); come to lights
mostly: May-Jul (BG data)
Life Cycle
Females lay eggs in living trees where sapwood exposed by injury; larvae bore into wood beneath(1)
, series of shots here:
males are territorial and guard egg-laying females(2)
Works Cited
1.Peterson Field Guides: Beetles
Richard E. White. 1983. Houghton Mifflin Company.
2.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
3.Checklist of beetles (Coleoptera) of Canada and Alaska. Second edition
Bousquet Y., Bouchard P., Davies A.E., Sikes D.S. 2013. ZooKeys 360: 1–402.
4. A distributional checklist of the beetles (Coleoptera) of Florida.
Peck & Thomas. 1998. Florida Department of Agriculture and Consumer Services, Gainesville. 180 pp.