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Genus Xestobium

little brown beetle - Xestobium affine Xestobium Xestobium Xestobium affine Ernobiinae - Xestobium Ernobiinae - Xestobium Ernobiinae - Xestobium Ernobiinae - Xestobium
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)
Superfamily Bostrichoidea (Carpet, Powder-post and Death-watch Beetles)
Family Ptinidae (Death-watch and Spider Beetles)
Subfamily Ernobiinae
Tribe Xestobiini
Genus Xestobium
Explanation of Names
Xestobium Motschulsky 1845
6 spp. in 2 subgenera in our area(1), a dozen in the Palaearctic
Xestobium (X.) abietis Fisher 1947
Xestobium (X.) affine LeConte 1874
Xestobium (X.) gaspensis White 1975
Xestobium (X.) rufovillosum (De Geer 1774)
Xestobium (Hyperisus) marginicolle (LeConte 1859)
Xestobium (H.) parvum White 1976
Some species are among the largest anobiids, up to 8 mm
Two pretty dissimilar subgenera:
Xestobium s.str.: dull, with mottled, recumbent pubescence (across NA)
Hyperisus Mulsant & Rey 1863: shiny, pubescence long, suberect and uniform (Pacific coast)
Species ID is tricky.
Larvae develop in dry wood of hardwoods or confers (depending on species)
type species: Xestobium rufovillosum (De Geer 1774) (European by origin)
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.