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Subfamily Coccidulinae

Rodolia cardinalis pupa? - Rodolia cardinalis Rodolia cardinalis Rhyzobius lophanthae? - Rhyzobius lophanthae Coccinellidae - Rodolia cardinalis Rodolia cardinalis (Mulsant) - Rodolia cardinalis Exoplectra schaefferi Gordon - Exoplectra schaefferi Anovia virginalis (Wickham) - Anovia virginalis Scymnus (?) with dark legs and orange-red posterior venter - Rhyzobius
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 Coccinelloidea
No Taxon (Coccinellid group)
Family Coccinellidae (Lady Beetles)
Subfamily Coccidulinae
Explanation of Names
Author: Mulsant, 1846

Coccid refers to soft scale insects, the main prey of these beetles.
Numbers
4 tribes with 7 genera in North America, according to American Beetles(1)

Tribe Coccidulini Mulsant, 1846
Genus Coccidula Kugelann, 1798
Genus Rhyzobius Stephens, 1829
Tribe Noviini Mulsant, 1850
Genus Rodolia Mulsant, 1850
Genus Anovia Casey, 1920
Tribe Exoplectrini Crotch, 1874
Genus Exoplectra Chevrolat, 1837
Tribe Azyini Mulsant, 1850
Genus Azya Mulsant, 1850
Genus Pseudoazya Gordon 1980
Identification
Most species red, brown, or black; one species metallic blue
Pubescent (hairy), ranging from short sparse hairs to long dense hairs
Most species round or rounded oval; one species elongated, almost rectangular
Food
Scale insects, especially soft scales (coccids).
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.