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Genus Disonycha

Flea Beetle - Disonycha xanthomelas Disonycha - Disonycha conjugata Disonycha - Disonycha pensylvanica Chrysomelidae - Lema sp.? - Disonycha alternata Disonycha pensylvanica Leaf Beetle - Disonycha sp - Disonycha pensylvanica Disonycha xanthomelas? - Disonycha xanthomelas Striped Beetle - Disonycha glabrata
Classification
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
'double-clawed'
Numbers
36 spp. in our area, ~150 spp. total(1)
Size
4-8 mm
Identification
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(4), D. arizonae and barberi treated in(5)

Keys are based on, and designed for, collection specimens. Soon after death, however, the vivid colours begin to fade, and only black remains black.
White, yellow, red become just shades of straw or brown. Live colouration is rarely mentioned in descriptions.
Range
New World; throughout the US & so. Canada(1)
Food
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)
Remarks
Still missing in the guide as of Nov.2018:
D. antennata Jacoby 1884 (all red); examples from Mexico
D. funerea (Randall 1838) (all black, resembles Kuschelina lugens);
plus striped species:
D. alabamae Schaeffer 1919 (median vitta close to sublateral)
D. balsbaughi Blake 1970 (median vitta abbreviated)
D. brevicornis Schaeffer 1931 (old records from Colorado, may be based on mislabeled specimens(4))
D. limbicollis (LeConte 1857) (CA, resembles D. uniguttata)
D. schaefferi Blake 1934
Of some of the latter we may have images, but ID is pending.
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. 1933. 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.