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Family Rhysodidae - Wrinkled Bark Beetles

Wrinkled bark beetles - Omoglymmius americanus Wrinkled bark beetles - Omoglymmius americanus Omoglymmius americanus Omoglymmius americanus Clinidium? - Clinidium Omoglymmius americanus Clinidium apertum allegheniense - Clinidium apertum Pennsylvania Beetle for ID - Clinidium
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Rhysodidae (Wrinkled Bark Beetles)
Synonyms and other taxonomic changes
Rhyssodidae Jacquelin du Val 1857
A recent trend (not followed by Bousquet (2012)(1) or on BG) is to treat this group as part of the Carabidae (a tribe of uncertain placement), notably in "Systematic List of Ground Beetles" (Lorenz 2005) and "A Treatise on the Western Hemisphere Caraboidea Vol III" (Erwin 2011)
Explanation of Names
Rhysodidae Laporte 1840
8 spp. in 2 genera in our area(2), >350 spp. in 40 genera worldwide(1)(3)
5-8 mm(2)
Key to genera in (2)
Regional species keys in(4)(5)(6)(7)

The two genera are easily told apart:
Omoglymmius has the elytral striae strongly punctate and the lateral grooves of the pronotum long

Clinidium has the elytral striae not or indistinctly punctate and the lateral grooves present only on basal half
Dead, often very moist, wood; both hardwoods and conifers are used(2)
Presumably slime molds (Myxomycetes)(2)
Print References
Catalogue in(8)
Internet References
Taxon profile (Bell 1999)
Works Cited
1.Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico
Bousquet Y. 2012. ZooKeys 245: 1–1722.
2.American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia
Arnett, R.H., Jr., and M. C. Thomas. (eds.). 2000. CRC Press LLC, Boca Raton, FL.
3.Order Coleoptera Linnaeus, 1758. In: Zhang Z.-Q. (ed.) Animal biodiversity: An outline of higher-level classification...
Ślipiński S.A., Leschen R.A.B., Lawrence J.F. 2011. Zootaxa 3148: 203–208.
4.Ground Beetles and Wrinkled Bark Beetles of South Carolina
Janet Ciegler. 2000. Clemson University.
5.The Beetles of Northeastern North America, Vol. 1 and 2.
Downie, N.M., and R.H. Arnett. 1996. The Sandhill Crane Press, Gainesville, FL.
6.The Beetles of the Pacific Northwest
Hatch, M. 1953. University of Washington publications in biology, Volume 16. University of Washington Press, Seattle, Washington.
7.Florida Wrinkled Bark Beetles (Coleoptera: Carabidae: Rhysodini)
8.Catalogue of the Geadephaga (Coleoptera: Trachypachidae, Rhysodidae, Carabidae including Cicindelini) of America north of Mexico
Y. Bousquet and A. Larochelle. 1993. Memoirs of the Entomological Society of Canada, 125: 1-397.