The millipede Pachyiulus krivolutskyi Golovatch, 1977, the easternmost species of the eastern Mediterranean genus Pachyiulus Berlese, 1883, endemic to the western Caucasus (Diplopoda: Julida: Julidae)

Pachyiulus krivolutskyi, the largest and perhaps the most picturesque millipede in the Caucasus endemic to its western part, is properly redescribed based on abundant new material. Three main colour morphs are distinguished, all illustrated and mapped. Clinal variation is revealed, as the morphs show evident geographical patterns replacing each other from north to south.