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Genus Chaetocnema

wee black beetle - Chaetocnema wee black beetle - Chaetocnema Chaetocnema  Flea Beetle  - Chaetocnema Chrysomelid - Chaetocnema Buttonwood flea beetle (Chaetocnema brunnescens Horn) and damage - Chaetocnema brunnescens Chaetocnema subviridis Chrysomelidae 13 - Chaetocnema
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)
Genus Chaetocnema
Explanation of Names
Chaetocnema Stephens 1831
Numbers
~60 spp. in our area, ~450 worldwide(1)
Size
1.1-3.25 mm
Identification
Pronotum with no special features, elytra with aligned, or (more rarely) confused punctures. Middle and hind tibiae with a blunt projection or tooth in the apical half, followed by an emargination. Among NA flea beetles, only Blepharida has similar tibiae (otherwise looks different).
Species ID often requires studying male genitalia and is usually impossible from photographs.
Key to 5 spp. found in se. Canada in(2)
Range
worldwide
Habitat
open habitats
Food
hosts include plants of many families; in our area, Poaceae, Cyperaceae, Chenopodiaceae, Convolvulaceae, Combretaceae, Polygonaceae, and Malvaceae
Life Cycle
Chaetocnema larvae are known to be subterranean, feeding on the underground portions of their host plants (Jolivet & Hawkeswood 1995)
Remarks
commercial pests: C. confinis (Sweetpotato Flea Beetle), C. denticulata (Toothed Flea Beetle), C. ectypa (Desert Corn Flea Beetle), C. pulicaria (Corn Flea Beetle)(2), C. repens (Dichondra Flea Beetle)(3)
Print References
Jolivet, P. & T.J. Hawkeswood. 1995. Host-plants of Chrysomelidae of the World: An essay about the relationships between the leaf-beetles and their food-plants. Backhuys Publishers, Leiden, The Netherlands. xiv + 281 pp.
Works Cited
1.A revision of the genus Chaetocnema of America north of Mexico (Coleoptera: Chrysomelidae)
White R.E. 1996. Contr. Am. Ent. Inst. 29: 1-158.
2.Chaetocnema flea beetles (Coleoptera: Chrysomelidae, Alticini) of the Maritime Provinces of Canada
Majka C.G., LeSage L. 2010. Journal of the Acadian Entomological Society 6: 34-38.
3.Garden Insects of North America : The Ultimate Guide to Backyard Bugs (Princeton Field Guides)
Whitney Cranshaw. 2004. Princeton University Press.