Species;"Shell shape";"Spire to shell height ratio";"R2 length compared to R3";"No. of R2 ribs";"Swelling of R3";"Aperture shape";"Outer peristome";"Inner peristome";Umbilicus "D. cucullatus";depressed-conical;~1/5;"≥ R3";49–57;"sharp; near aperture";round;"fringed, slightly reflected but not conspicuous";"with four to five indentations, always with parieto-columellar; sometimes weak at basal";round "D. notus";depressed-conical;~1/5;"≤ R3";48–50;"low blunt; central; more elevated in newly examined population";round;"expanded, reflected";"without indentation; with parieto-columellar angle in newly examined population";round "D. omissus";depressed-conical;~1/4;"< R3";35–36;"blunt; central";round;"expanded, not reflected";"without indentation; with beak-like basal protrusion in newly examined population";round "D. pratatensis";depressed-conical;~1/6;"< R3";44–51;"prominent, blunt; near aperture; anterior slope steeper than posterior slope";round;"expanded, not reflected";"without indentation; with slight parieto-columellar angle";round "D. borealis sp. nov.";depressed-conical;~1/6;"> R3";~72;"very low and elongated";oval;"expanded, not reflected";"with three very shallow indentations, always without parieto-columellar";round "D. burchi sp. nov.";conical;~1/2;"~ R3";36–43;"sharp and narrow or blunt and more elongated; central or near aperture";round;"expanded, reflected, most conspicuously at the upper palatal position and near the umbilicus";"without indentation";"partly or entirely covered by expanded outer peristome" "D. panhai sp. nov.";"depressed-conical with triangular dorsal side";~1/3;"twice shorter than R3";~18;"blunt; central";round;"expanded, not reflected";"without indentation";elliptical "D. pongrati sp. nov.";"lenticular, depressed-conical";~1/4;"three times longer than R3";~76;"not swelling";round;"expanded, slightly reflected";"with two shallow indentations";elliptical