Somatochlora borisi was discovered only in 1999 and described by Milen Marinov two years later. The species is endemic to rivers and streams in forest-covered hills in southeast Bulgaria, northeast Greece and adjacent European Turkey. Imagos are found from May to July, tirelessly flying over deep, sunlit stretches of the rivers. In appearance, Somatochlora borisi looks somewhat like an intermediate between Cordulia aenea and other Somatochlora species. Therefore some taxonomists put the species in its own, monotypic, genus Corduliochlora.