Records of the Grassflies (Diptera, Chloropidae) of the Palaearchearctic Geoelement on the Altai Mountains
Records of the Grassflies (Diptera, Chloropidae) of the Palaearchearctic Geoelement on the Altai MountainsFour species of grassflies (Diptera, Chloropidae),Lasiambia shatalkiniNartshuk, 1986,Siphunculina stackelbergiDuda, 1933,Centorisoma flavumNartshuk, 1965, andCetema bispinosaDuda, 1933 are found on the Altai Mountains. These species were hitherto known from the Far East of Russia and the latter also from North Mongolia. The new records clarify the western border of ranges of these species. Distribution of the generaCentorisomaBecker, 1910 andCetemaHendel, 1907, each including in the Palaearctic two groups of species with centres of distribution in Europe and the Far East, permits to consider the origin of these genera from Tertiary Turgai forests.