Thymalus marginicollis

Members of the genus Thymalus can be distinguished from related bark-gnawing beetles by their compact, somewhat flattened body form and characteristic antennal structure. The specific epithet 'marginicollis' refers to the margined or bordered pronotum, a diagnostic feature for this species. Accurate identification to species level typically requires examination of the pronotal margins, elytral sculpture, and male genitalia.

Associated with forested environments; larvae and adults inhabit woody substrates including under bark and in decaying wood.

Canada: Alberta, British Columbia, Manitoba, New Brunswick, and Newfoundland (ISO 3166-2:CA-AB; CA-BC; CA-MB; CA-NB; CA-NF). The species has a transcontinental Canadian distribution spanning from the Atlantic provinces to western Canada.

As with other members of Thymalidae, likely functions as a predator in subcortical habitats, feeding on other small arthropods inhabiting bark and decaying wood communities.

No significant direct economic importance to humans; occasionally encountered in forest entomology surveys and biodiversity assessments.

• Thymalus spp.Other species in the genus share the compact body form and bark-associated habits, requiring detailed examination of pronotal and elytral characters for separation.
• Trogossitidae (historical placement)Thymalidae was formerly treated as a subfamily of Trogossitidae; specimens may be cataloged under this broader classification in older collections.

• bark-gnawing beetle
• Thymalidae
• Canadian fauna
• forest beetle
• subcortical predator

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Meloidae Holdings | Entomology Research Museum
• Tenthredinidae | Beetles In The Bush
• Super Crop Challenge #5 | Beetles In The Bush