– A freshly emerged $ was collected in the city of Omsk (55°57’N, 73<>22’E) on 8-VI-2007 at an oxbow of the Irtish R. influenced by sinks of a deep ground mineral water. This is the northernmost A. parthenope record in Siberia and the first record in the West Siberian Plain. Perhaps presently the sp. is colonizing Siberia from the South. At the same locality, Cordulia aenea was also recorded, which was previously reported for Omsk by S.D, LAVROV (1927, Proc. sib. Inst. Agric. Forestry 8/3: 51-100), but it was not found there in the 1970- -80s by O.E. KOSTERIN (1996, Acta hydroent. latvica 3: 10-21).