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For the United States & Canada
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Family Trogidae - Hide Beetles

Unusual Little Guy - Trox small hide beetle - Trox Ironclad Beetle, Phloeodes  ? - Trox gemmulatus Trox - Omorgus Hide Beetle - Omorgus umbonatus Trox sp.? - Trox plicatus Trox Yellow Markings - Omorgus
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)
Superfamily Scarabaeoidea (Scarab, Stag and Bess Beetles)
Family Trogidae (Hide Beetles)
Other Common Names
Skin Beetles
Synonyms and other taxonomic changes
until recently, N. Amer. workers treated this group as a subfamily of the Scarabaeidae, and Omorgus as a subgenus of Trox; here we follow the classification outlined in Arnett et al. (2002)(1)
Explanation of Names
Trogidae MacLeay 1819
ca. 40 spp. n. of Mex. (1)(2), (~300 spp. in 4 genera worldwide) (3)
5.0-17.5 mm (NE spp.) (4)
Roughly sculptured, often covered with a crust of soil(5)
Two genera:
Trox - 3-12mm, rounded scutellum [left]
Omorgus - 9-20mm, hastate scutellum [right]

For identification, see(6)(7)(8)(4)
worldwide, rather evenly distributed between continents (3)
on carrion at late stages of decomposition, on owl pellets, in bird and mammal nests, on carnivore scat containing hair/bones; more common in drier regions (4)
Year round, at least in the South
skin, bone, hair, feathers; Trogidae are among the last scavengers to visit dry animal remains (4)
many spp. come to lights (4)
Print References
LeConte, J.L. 1854. Descriptions of the species of Trox and Omorgus inhabiting the United States. Proceedings of the Academy of Natural Sciences of Philadelphia 7: 211-216.
Works Cited
1.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.
2.Checklist and Nomenclatural Authority File of the Scarabaeoidea of the Nearctic Realm
3.Checklist and bibliography of the Trogidae (Coleoptera: Scarabaeoidea)
Zidek J. 2013. Insecta Mundi 0314: 1-38.
4.The Scarabaeoid Beetles of Nebraska
Brett C. Ratcliffe & M.J. Paulsen. 2008. University of Nebraska State Museum, Vol 22, 570 pp.
5.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.
6.A revision of the genus Trox in North America (Coleoptera, Scarabaeidae)
P. Vaurie. 1955. Bull. Amer. Mus. Nat. Hist. 106: 1-89.
7.Two new species of Trox from Florida (Coleoptera, Scarabaeidae)
P. Vaurie and H.F. Howden. 1957. American Museum novitates, no. 1818.
8.The Beetles of Northeastern North America, Vol. 1 and 2.
Downie, N.M., and R.H. Arnett. 1996. The Sandhill Crane Press, Gainesville, FL.
9.A Manual of Common Beetles of Eastern North America
Dillon, Elizabeth S., and Dillon, Lawrence. 1961. Row, Peterson, and Company.
10.Scarab beetles (Coleoptera: Scarabaeidae) of South Carolina
Phillip J. Harpootlian. 2001. Clemson University Public Service.