Lyctus

Distinguished from other Bostrichidae by the two-segmented antennal club (versus three segments in most related genera). The pronotum has a distinct posterior margin that is narrower than the elytral base. Separated from Anobiidae by the more slender body form and different antennal structure. Identification to species level requires examination of genitalia and subtle differences in punctation patterns.

Small, slender beetles, typically 2–7 mm in length. Body is elongated and somewhat flattened. Antennae are clubbed with two-segmented clubs. Coloration ranges from reddish-brown to black. Elytra are often marked with fine punctures and may appear slightly hairy. The pronotum is narrower than the base of the elytra and has distinct lateral margins.

Associated with hardwood timber and wood products. Found in seasoned wood, lumber, furniture, and structural timbers. Requires wood with sufficient starch content for larval development. Not found in living trees or softwoods.

Cosmopolitan distribution; present on all continents except Antarctica. GBIF records confirm occurrence in Denmark, Norway, and Sweden.

Larvae feed on starch stored in hardwood vessels and rays. Adults do not feed; they rely on fat reserves accumulated during larval development. Wood must contain starch content above approximately 3% for successful larval development.

Complete metamorphosis with egg, larva, pupa, and adult stages. Eggs are deposited in wood pores or cracks. Larvae tunnel through wood, creating fine, powdery frass. Development time varies from several months to multiple years depending on temperature, humidity, and wood starch content. Adults emerge through round exit holes approximately 1–2 mm in diameter.

Adults are cryptic and primarily nocturnal. They are attracted to light in some species. Mating occurs on wood surfaces. Females seek cracks, checks, or pores in wood to deposit eggs. Larvae remain within wood until pupation, creating extensive tunnel networks that reduce wood to a fine powder.

Decomposers of dead hardwood in natural settings. In native ecosystems, they contribute to nutrient cycling by breaking down fallen branches and logs. In human-modified environments, they function as pests by degrading stored wood products.

Significant economic pest of hardwood lumber, flooring, furniture, and structural timbers. Infestations are detected by the presence of fine, flour-like frass and small round exit holes. Control relies on reducing wood moisture content below 20% and using kiln-dried lumber. Some species are quarantine pests of international concern.

• AnobiidaeSimilar powderpost beetles but distinguished by three-segmented antennal clubs and more rounded body form; Anobiidae also infest softwoods while Lyctus is restricted to hardwoods.
• BostrichusRelated genus in Bostrichidae with three-segmented antennal clubs and more robust body; Bostrichus species are larger and attack both hardwoods and softwoods.

• wood-borer
• pest
• hardwood
• stored product
• powderpost beetle

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Biology of the Southern Lyctus Beetle, Lyctus Planicollis
• Lipid Biosynthesis in the Southern Lyctus Beetle, Lyctus Planicollis, Leconte (Coleoptera: Lyctidae): Distribution of Carbon From U-(Carbon-14 Labeled)-Glucose in the Principal Lipid Classes and Fatty Acids During Growth and Development.