Brachysomida nigripennis

Brachysomida nigripennis can be distinguished from other Brachysomida species by its predominantly black or very dark elytra, lacking the distinct pale markings or bivittate (two-striped) patterns seen in congeners such as B. bivittata. The dark wing coloration provides the basis for both the specific epithet "nigripennis" (black-winged) and the common name. Adults have the elongated antennae typical of Cerambycidae and the somewhat flattened, parallel-sided body form characteristic of the Lepturinae subfamily.

Northern coniferous and mixed woodlands, including boreal forest zones. Associated with wooded environments where host trees occur.

North America: Canada (Alberta, Manitoba, New Brunswick, Nova Scotia) and northern United States. The species has a transcontinental northern distribution pattern.

Adults are active during the warmer months, typically from late spring through summer, with peak activity likely corresponding to flowering periods of associated vegetation.

• Pinus - larval hostconifers

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae are wood-borers, developing within the stems or branches of host trees. Adults emerge and are often found on flowers where they may feed on pollen or nectar.

Adults are diurnal and frequently encountered on flowers, a common behavior among Lepturinae. The flower-visiting habit facilitates both feeding and mate-finding.

Larvae contribute to wood decomposition and nutrient cycling in forest ecosystems through their tunneling activity in dead or dying wood. Adults may serve as minor pollinators through their flower-visiting behavior.

• Brachysomida bivittataVery similar congener; B. nigripennis lacks the pale longitudinal stripes on the elytra that characterize B. bivittata. The two species have been historically confused, with B. nigripennis sometimes treated as a synonym of B. bivittata in some taxonomic treatments.
• Other Lepturinae generaMembers of the subfamily Lepturinae share the somewhat flattened body form and flower-visiting habits, but Brachysomida species can be distinguished by specific antennal and pronotal characteristics.

• Cerambycidae
• Lepturinae
• Rhagiini
• long-horned beetle
• flower-visiting
• wood-borer
• boreal
• North America
• conifer-associated
• taxonomic uncertainty

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Meloidae Holdings | Entomology Research Museum
• First collecting trip of the season! | Beetles In The Bush
• Ted C. MacRae | Beetles In The Bush | Page 5
• Scathophagidae | Beetles In The Bush