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Bark beetle outbreak sites were analysed before sanitary logging in Gorski Kotar County during spring, summer and autumn 2021. Downed European silver fir trees were inspected for red-listed saproxylic entomofauna. Among other species, the fir pinhole borer (Treptoplatypus oxyurus, Dufour, 1843) (Coleoptera: Platypodidae) was observed and studied on-site and in the laboratory. Symptoms of T. oxyurus presence were recognised as white filamentous bites of sawdust on the bark of the fir trees and the surrounding soil. Every tree infested infested with T. oxyurus was measured (diameter at breast height, height/length), and its position was recorded. Segments were collected for laboratory analysis to evaluate the layout and position of T. oxyurus gallery system. The results showed that individual corridors of T. oxyurus, as a rule, never intersect, cross or connect. Each family of beetles (male, female and their offspring) lives separately in its corridor system. There were examples of corridors that were very close to each other but did not touch. T. oxyurus is still completely unknown to forest operatives in Croatia, who do not recognise symptoms of its occurrence.

Rare European Beetle Treptoplatypus oxyurus (Coleoptera: Platypodidae) in Managed Uneven-Aged Forests of Croatia