title: Rhagium mordax
text: # Rhagium mordax
  
  Rhagium mordax, the black-spotted longhorn beetle, is a species of long-horned beetle. This beetle is found throughout Europe and to Kazakhstan and Russia. Larvae develop in silver fir, hazel, European weeping birch, European beech, and the European chestnut. Ischnoceros rusticus is an ichneumonid parasitoid wasp that feds on Rhagium mordax larvae.
  
  ## Subtaxa
  
  There are five formally described varieties:
  
  * Rhagium mordax var. altajense Plavilstshikov, 1915
  * Rhagium mordax var. klenkai Heyrovský, 1914
  * Rhagium mordax var. mediofasciatum Plavilstshikov, 1936
  * Rhagium mordax var. morvandicum Pic, 1927
  * Rhagium mordax var. subdilatatum Pic, 1917
  