Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

National Moth Week 2020 photos of insects and people.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama


TaxonomyBrowse
Info
ImagesLinksBooksData

Genus Rhyzobius

Rhyzobius lophanthae (Blaisdell) - Rhyzobius lophanthae Black on black - Rhyzobius forestieri Rhyzobius lophanthae (Blaisdell) - Rhyzobius lophanthae Dusky Lady Beetle? - Rhyzobius forestieri Another pink pupa? - Rhyzobius lophanthae Scymnus? - Rhyzobius lophanthae Scymnus? - Rhyzobius lophanthae Lady Beetle - Rhyzobius lophanthae
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
Tribe Coccidulini
Genus Rhyzobius
Synonyms and other taxonomic changes
First described in 1832 by James Francis Stephens as Rhyzobius. The correct spelling according to the Greek should be Rhizobius, but the rules don't allow a correction in this case. As a result, both spellings are widespread.
Explanation of Names
from Greek rhiza (ριζα)- "root" + bios (βιος)- "life, way of life". The species best known at the time lives at the roots of plants.
Numbers
Two introduced species in North America:
Size
1.5-3.7 mm long
Identification
Dark reddish-brown or black
Metallic
Densely pubescent (hairy), with a layer of short fine hairs interspersed with some longer hairs; densely "fuzzy" appearance.
Eyes not pubescent
Range
Rhyzobius forestieri: Western California.
Rhyzobius lophanthae: Transcontinental in the southern U.S.
Food
Scale insects.
See Also
Dusky Lady Beetles of Tribe Scymnini look extremely similar, with dark brown or black coloration and pubescence. However, all members of Tribe Scymnini have pubescent eyes and none are metallic. They also have hairs of a single length, not two layers of longer and shorter hairs like Rhyzobius.
Internet References
Illustrations of British Entomology, p.396    Stephens' original description of the genus.