Rhagium mordax, the black-spotted longhorn beetle,[1] is a species of long-horned beetle.[2] This beetle is found throughout Europe and to Kazakhstan and Russia.[2] Larvae develop in silver fir, hazel, European weeping birch, European beech, and the European chestnut.[2] Ischnoceros rusticus is an ichneumonid parasitoid wasp that feds on Rhagium mordax larvae.[2]
There are five formally described varieties:[2]