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Genus Disonycha

Flea Beetle - Disonycha pensylvanica Large flea beetle - Disonycha triangularis flea beetle - Disonycha BG2655 E6002 - Disonycha pensylvanica Disonycha sp. - Disonycha Disonycha glabrata Beetle - Disonycha Flea Beetle - Disonycha triangularis
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 Chrysomeloidea (Long-horned and Leaf Beetles)
Family Chrysomelidae (Leaf Beetles)
Subfamily Galerucinae (Skeletonizing Leaf Beetles and Flea Beetles)
Tribe Alticini (Flea Beetles)
No Taxon (Disonycha Genus Group)
Genus Disonycha
Explanation of Names
Disonycha Chevrolat 1836
36 spp. in our area, ~150 spp. total(1)
4-8 mm
Large alticines, elytra usually striped, hind pronotal corners angular(2), or as Ciegler (2007)(3) puts it:
"The basal margin of the pronotum is distinctive in being anteriorly angulate near the hind angle, so that angle is set farther from the elytra than in most of the beetles," e.g.

incomplete key to spp. in Blake (1934)(4), add'l spp. in Blake (1951)(5)
New World; throughout the US & so. Canada(1)
a diverse array of plants; larvae are folivorous(1), most spp. feed on weeds(2)
Life Cycle
Larvae often found together with adults on host plants(1)
Still missing in guide (Apr.2017):
D. funerea (all black)
D. antennata (all pale)
plus striped species:
D. alabamae, D. brevicornis, D. latiovittata, D. limbicollis, D. pluriligata, D. punctigera, D. schaefferi.
Of some of the latter we may have images, but ID is pending.
For D. latifrons see under "possibly latifrons".
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.Peterson Field Guides: Beetles
Richard E. White. 1983. Houghton Mifflin Company.
3.Leaf and Seed Beetles of South Carolina
Janet Ciegler. 2007. Clemson University.
4.Revision of the Beetles of the Genus Disonycha Occuring in America North of Mexico
Doris Holmes Blake. 1934. Proceedings of the United States National Museum, Vol 82.
5.New species of chrysomelid beetles of the genera Trirhabda and Disonycha
Doris H. Blake. 1951. Journal of The Washington Academy of Sciences, Vol. 41, No. 10, pp. 324-328.