Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Romualdius scaber - Crusted Root Weevil

Trachyphloeus bifoveolatus (Beck) - Romualdius scaber Broad-nosed Weevil - Romualdius scaber Broad-nosed Weevil - Romualdius scaber Weevil - Romualdius scaber - female unknown weevil - Romualdius scaber Broad-nosed Weevil - Romualdius scaber Crusted Root Weevil - Romualdius scaber Romualdius scaber
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 Curculionoidea (Snout and Bark Beetles)
Family Curculionidae (Snout and Bark Beetles)
Subfamily Entiminae (Broad-nosed Weevils)
Tribe Trachyphloeini
Genus Romualdius
Species scaber (Crusted Root Weevil)
Synonyms and other taxonomic changes
Trachyploeus bifoveolatus (Beck 1817)
Transfer to Romualdius in 2009 (1), identity with Curculio scaber Linnaeus confirmed in 2013 (2)
Explanation of Names
Romualdius scaber (Linnaeus, 1758)
Size
3-4 mm
Identification
Body densely covered with round, adpressed scales, that are grey to brown and do not form a conspicous pattern. A few short and apically dilated, erect bristles also present, but not influencing "smooth" look of the surface.
Rostrum with the antennal grooves visible in dorsal view as sublateral slits, dorsal surface of rostrum gently tapering anteriourly.
End of anteriour tibia rounded, lacking exteriour or apical spines, only stiff setae and interiour spur present.
Range
native to Europe, adventive in NA(3) and now rather widespread; transcontinental in Canada(4)
Habitat
soil; spreads with dry ballast(3); recorded in houses in e. & w. US(5)
Season
all year round
Food
Plant detritus, does not feed much on living plants
Remarks
flightless and parthenogenetic (females only)
earliest record in our area: NY 1917(3)
Works Cited
1.Revision of the palearctic supraspecific taxa of the tribe Trachyphloeini (Coleoptera: Curculionidae: Entiminae).
Borovec, Roman. 2009. Klapalekiana 45: 1-97.
2.Catalogue of Palaearctic Coleoptera 8: Curculionoidea II
Löbl, I.; Smetana, A. (Eds). 2013. Brill.
3.The weevils (Coleoptera: Curculionoidea) of the Maritime Provinces of Canada, II: New records from Nova Scotia...
C.G. Majka, R.S. Anderson, & D.B. McCorquodale. 2007. The Canadian Entomologist 139: 397–442.
4.Checklist of beetles (Coleoptera) of Canada and Alaska. Second edition
Bousquet Y., Bouchard P., Davies A.E., Sikes D.S. 2013. ZooKeys 360: 1–402.
5.Handbook of urban insects and arachnids: A handbook of urban entomology
Robinson W.H. 2005. Cambridge University Press.