Lyctinae

Distinguished from other Bostrichidae by the combination of a reduced prothorax (head visible from above) and two-segmented antennal clubs. Within Lyctinae, tribes can be separated by antennal club segmentation and other characters: Trogoxylini includes species with two- or three-segmented clubs, while some genera like Cephalotoma show reduced wood-boring mouthparts. Eurasian species can be identified using the key provided by Liu et al. (2019), which covers three tribes, seven genera, and 38 species.

Small to medium woodboring beetles with a reduced prothorax that does not conceal the head, unlike most bostrichid beetles. Antennae terminate in a two-segmented club. Body form generally cylindrical and adapted for wood-boring. Specific morphological features vary among tribes and genera; for example, Cephalotoma species lack the mandibular and prothoracic modifications needed for wood-boring.

Primarily associated with wood, including deciduous trees, felled timber, and wood products. Specific habitat associations vary by genus: most excavate galleries in sound or seasoned wood, while the genus Cephalotoma occupies galleries freshly created by other bostrichid beetles. The Australian genus Loranthophila is associated with mistletoe. Some species occur in coffee plantation areas and other agricultural-forest interfaces.

Worldwide distribution. The tribe Trogoxylini occurs on all continents. Eurasian fauna includes 38 species across three tribes and seven genera. The genus Cephalotoma has four species in the Oriental region (Thailand, Vietnam, Sri Lanka, Indochinese Peninsula, Indonesia, New Guinea, India) and two in the Ethiopian region. Loranthophila is restricted to Australia.

Larvae feed on wood, particularly the starch content of deciduous trees and seasoned timber. Adults of most genera also consume wood, but adults of Cephalotoma do not bite into wood due to morphological constraints and presumably feed on materials within existing galleries.

• Mistletoe - associated withLoranthophila genus
• Deciduous trees - hostprimary wood source for most lyctines
• Xylothrips flavipes - gallery associationCephalotoma uses galleries of this and other bostrichid beetles
• Xylothrips - gallery associationgenus whose galleries are used by Cephalotoma
• Sinoxylon - gallery associationgenus whose galleries are used by Cephalotoma
• Bostrychopsis - gallery associationgenus whose galleries are used by Cephalotoma
• Bostrychoplites - gallery associationgenus whose galleries are used by Cephalotoma
• Heterobostrychus - gallery associationgenus whose galleries are used by Cephalotoma
• Apate - gallery associationgenus whose galleries are used by Cephalotoma

Complete metamorphosis with egg, larval, pupal, and adult stages. Larvae are wood-borers that create tunnels in host material. Most genera excavate their own galleries, but Cephalotoma adults use holes and galleries freshly bitten by other bostrichid beetles. Multiple Cephalotoma specimens (up to a dozen) may occupy a single gallery. Whether Cephalotoma destroys eggs of other powderpost beetles or is strictly commensal remains unconfirmed.

Adults of most genera actively bore into wood for feeding and reproduction. However, Cephalotoma adults do not bite into wood due to morphological constraints and instead locate and occupy galleries created by other bostrichid beetles. This behavior may represent commensalism or potential predation/parasitism on other powderpost beetle eggs, though the exact relationship has not been confirmed. Cephalotoma adults are often found in groups within single galleries.

Primary wood decomposers and pests of timber products through larval feeding. Cephalotoma occupies a distinctive role as a commensal or possibly predatory/parasitic member of wood-boring beetle communities, utilizing resources created by primary borers without excavating its own galleries. The subfamily contributes to nutrient cycling in dead and dying wood but also causes economic damage to stored timber and wood products.

Economically significant pests of wood products, particularly seasoned hardwoods used in furniture, flooring, and structural timber. Damage appears as fine, powdery frass and exit holes. Growing importance as pests in Eurasia and globally due to international timber trade. Some species attack deciduous trees in forestry settings.

• Other Bostrichidae (non-Lyctinae)Most bostrichid beetles have a large prothorax that conceals the head from above, unlike Lyctinae which have a reduced prothorax. Lyctinae also have two-segmented antennal clubs, whereas some related groups may have three-segmented clubs.
• Anobiidae (furniture beetles)Both are woodboring beetles in the superfamily Bostrichoidea, but Anobiidae typically have different antennal structures and body proportions. Lyctinae are distinguished by their two-segmented antennal clubs and reduced prothorax.

• wood-boring
• pest
• timber pest
• powderpost beetle
• Lyctinae
• Bostrichidae
• Coleoptera

• BugGuide
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Loranthophila, a new genus of Australian Lyctinae (Coleoptera: Bostrichidae) associated with Mistletoe
• <strong>A synopsis of the Lyctine beetles of Eurasia with a key to the species (Insecta: Coleoptera: Bostrichidae: Lyctinae)</strong>
• Cephalotoma patcharinae n. sp.-The First Record of Cephalotoma Species with a 2-Segmented Club of Antennae in the Oriental Region (Bostrichidae, Lyctinae: Trogoxylini).