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Genus Odonteus

Odonteus darlingtoni - male Earth Boring Dung Beetle - Odonteus obesus Scarab 1 - Odonteus - male Odonteus thoracicornis Wallis - Odonteus thoracicornis Dung Beetle - Odonteus - male Beetle unknown - Odonteus Bolboceras floridensis - Odonteus floridensis - male Beetle  - Odonteus
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 Geotrupidae (Earth-Boring Scarab Beetles)
Subfamily Bolboceratinae
Genus Odonteus
Synonyms and other taxonomic changes
Odontaeus Dejean 1821 (now typically treated as subsequent misspelling)
Bolboceras of authors (after Cartwright 1953; see ICZN opinion 2138, Case 3097. [by affixing the type as S. quadridens (as opposed to S. mobilicornis (=armiger)), Bolboceras Kirby 1819 becomes a senior syn. of Indobolbus Nikolajev 1979]
Explanation of Names
Odonteus Samouelle 1819
10 spp. in our area (13 total):(1)(2)
Odonteus alabamensis Wallis 1929 - SC-FL-MS
Odonteus cornigerus (Melsheimer 1844) - ne US to NC
Odonteus darlingtoni Wallis 1928 - se US
Odonteus falli Wallis 1928 - e NA
Odonteus filicornis (Say 1823) - SK-MB-WI to TX-MS
Odonteus floridensis Wallis 1928 - FL
Odonteus liebecki Wallis 1928 - e NA
Odonteus obesus LeConte 1859 - BC-AB & w US
Odonteus simi Wallis 1928 - e US
Odonteus thoracicornis Wallis 1928 - e US (PA-FL to IA-KS-TX)
5-10 mm
Eyes completely divided by canthus. Sexual dimorphism usually obvious, males often with prominent horn. Species identification often requires examination of genitalia.
Key to spp. in(3)
holarctic & S Asia; in our area, most spp. east of NE-TX, one strictly western
Late spring and late summer to fall. In SC: B. liebecki May and Jul-Oct, B. thoracicornis Apr-May, Sep-Nov(4)
Life Cycle
Adults dig burrows and provision with organic matter (e.g., dung, humus). The same burrow may contain eggs, larvae, pupae, and adults at the same time. Presumably overwinter as adults at times, given the two seasons of occurrence.
Print References
Wallis J.B. (1929) A new species of Odontaeus, Dej. Canadian Entomologist 61:239-241.
Cartwright O.L. (1953) Scarabaeid beetles of the genus Bradycinetulus and closely related genera in the United States. Proc. U.S. Nat. Mus. 103(3318): 95-120; 4 pl. [note: moves our fauna from Odontaeus to Bolboceras - found overlooked, and evidently invalid type designation by Curtis]
Howden H.F. (1955) The biology and taxonomy of North American beetles of the subfamily Geotrupinae with revisions of the genera Bolbocerosoma, Eucanthus, Geotrupes, and Peltotrupes. Proceedings of the United States National Museum 104(3342):151-319, 18 pl. [refers you to the Wallis'S works for ID purposes, adds some notes and new records]
Works Cited
1.The Scarabaeoid Beetles of Nebraska
Brett C. Ratcliffe & M.J. Paulsen. 2008. University of Nebraska State Museum, Vol 22, 570 pp.
2.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.
3.Revision of the genus Odontaeus, Dej.
Wallis J.B. 1928. Can. Entomol. 60: 119-128; 151-156; 168-176.
4.Scarab beetles (Coleoptera: Scarabaeidae) of South Carolina
Phillip J. Harpootlian. 2001. Clemson University Public Service.