Ambrosiophilus atratus

Distinguished from other European ambrosia beetles by the complete coverage of the pronotum with asperities. This character separates it from superficially similar species in the region. Identification confirmed through morphological comparison with illustrated keys (Rabaglia et al. 2006; Faccoli et al. 2009).

Small ambrosia beetle distinguished by dense asperities (small raised projections) covering the entire surface of the pronotum. Typical scolytine body plan with compact, cylindrical form adapted for burrowing in wood.

Deciduous temperate forests. Associated with woody substrates suitable for ambrosia beetle colonization.

Native to North America and Southern Asia. First European record from Slovenia (Klavže, 46° 09′ 39″ N, 13° 48′ 7″ E) in 2017. Non-native established population in Europe.

Fungus-farming ambrosia beetle. Adults and larvae feed on symbiotic ambrosia fungi cultivated within wood galleries, not on wood tissue itself.

Typical ambrosia beetle life cycle involving gallery excavation in wood, inoculation with ambrosia fungi, and larval development within fungal gardens. Specific details for this species not documented.

Attracted to ethanol-baited traps. Exhibits colonization behavior typical of invasive ambrosia beetles, establishing in new regions through human-mediated transport of wood products.

Non-native invasive species. As an ambrosia beetle, introduces symbiotic fungi into host trees and may contribute to tree stress or mortality, particularly in novel environments without co-evolved host defenses.

Subject of biosecurity monitoring due to invasive potential. Detection in Slovenia prompted targeted surveillance to assess distribution and spread. Represents emerging threat to European forest health through ambrosia fungus introduction.

• Ambrosiodmus rubricollisCo-occurring non-native ambrosia beetle detected simultaneously in Slovenia; distinguished by different pronotal sculpture and coloration
• Xylosandrus germanusTarget species of original monitoring program that led to A. atratus detection; similar size and ecology but distinct pronotal and elytral characters

• invasive species
• ambrosia beetle
• fungus-farming
• Scolytinae
• forest pest
• Europe
• North America
• Asia

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Bug Eric: Caught on Video: Prionyx atratus
• Tabanidae | Beetles In The Bush
• Brazil Bugs #4 – Mais dos percevejos | Beetles In The Bush
• The first record of two non-native ambrosia beetles in Slovenia: Ambrosiodmus rubricollis (Eichhoff, 1875) and Ambrosiophilus atratus (Eichhoff, 1875) (Coleoptera: Curculionidae, Scolytinae)