Distinguishing characters of D. dahli. A. Between the central temporal and tympanum shields in the narrowest place in the same row, there are 2-3 enlarged shields (indicated by arrow); B. In front of the large anal shield, there are always two symmetrical enlarged pre-anal ones (indicated by arrow). The differences between D. dahli and D. armeniaca also exist in number and placement of ciliar granules. Photos by I. Kropachev.