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Family Nitidulidae - Sap-feeding Beetles

Nitidulidae? - Stelidota geminata Nitidulidae - Epuraea? - Epuraea Nitidulidae, dorsal - Lobiopa undulata Nitidulidae - Phenolia grossa Nitidulid - Cryptarcha concinna Male, Carpophilus hemipterus? - Carpophilus hemipterus - male Psilopyga histrina Amphicrossus ciliatus
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 (Nitidulid series)
Family Nitidulidae (Sap-feeding Beetles)
Synonyms and other taxonomic changes
a classification of world genera here (Kireitschuk 2012); Cybocephalidae and Prometopinae restored(1)
Explanation of Names
Nitidulidae Latreille 1802
~165 species in 30 genera in our area(2), ~4500 spp. in 350 genera worldwide(3); 73 spp. in WI(4); 70 spp. in Indiana (5)
Overview of our fauna
0.9-15 mm
Brief visual guide to NA fauna TBA
For other visual guides, see(6)(7); for keys to most spp., see(8)(9)
Oblong or oval, convex to flattened, usually dark, sometimes with red or yellow marks. Head not concealed from above. Dorsal surface has punctures, usually uniform in size. Elytra usually lack striations, but some genera, such as Stelidota, have them. Typically, elytra are shortened, exposing 1-3 abdominal segments. In some genera elytra cover abdominal segments. Margins of pronotum usually expanded and thin. Examples of typical body forms:

On ventral surface, prosternum has a process produced between the front coxae (basal segment of legs):

Antennae have 11 segments, last three (sometimes two) forming an abrupt, ball-like club:

Tarsal formula is usually 5-5-5 (all tarsi 5-segmented), rarely 4-4-4. Fourth tarsal segment is reduced, and fifth is typically the longest:
worldwide and across NA
Most are saprophagus and mycetophagus (fungi, plant matter, sap, decaying fruit). Others are associated with flowers, carrion (e.g. Nitidula and Omosita), bee nests (e.g. the small hive beetle Aethina tumida), ant nests (e.g. Amphotis), and still others are stored product pests (e.g. some Carpophilus species).
In some groups larvae are predatory, especially on bark beetle larvae (Scolytinae). The larvae of Cybocephalus spp. are predatory on coccids.
Internet References
Works Cited
1.Molecular phylogeny of Nitidulidae: assessment of subfamilial and tribal classification...
Cline A.R., Smith T.R., Miller K., Moulton M., Whiting M., Audisio P. 2014. Systematic Entomology 39: 758–772.
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.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.An annotated checklist of Wisconsin sap and short-winged flower beetles (Coleoptera: Nitidulidae, Kateretidae)
Price M.B., Young D.K. 2006. Insecta Mundi 20: 69-84.
5.A checklist of the sap beetle (Coleoptera: Nitidulidae) fauna of Indiana, with notes on effective trapping methods
G.S. Powell. Insecta Mundi 2015 (0424): June 5, 2015.
6.Price M.B., Cira T. (2008) Kateretidae & Nitidulidae of Wisconsin
7.Collison C., MacGown J. (2010) Nitidulidae in the Mississippi Entomological Museum
8.A revision of Neartic Nitidulidae (Coleoptera)
Parsons C.T. 1943. Bull. comp. Zool. 92: 121-278.
9.The Beetles of Northeastern North America, Vol. 1 and 2.
Downie, N.M., and R.H. Arnett. 1996. The Sandhill Crane Press, Gainesville, FL.
10.University of Florida: Featured Creatures
11.Ohio State University Extension fact sheets