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<p>A new fossil species of the silvanid flat bark beetle genus <i>Cathartosilvanus</i> Grouvelle is described and illustrated from Baltic amber. <i>Cathartosilvanus siteiterralevis</i> sp. nov. differs from recent and fossil congeners in the distinct, sharp denticle found along its posterior pronotal angle. The phenomenon of specific body parts becoming disconnected, and the compression of specimens is briefly discussed and interpreted in the context of amber taphonomy. The specimen under study appears to be an uncommon case of a weakly sclerotized beetle imago becoming entrapped in resin shortly after moulting.</p>