| Pedicel simple, short, expanded apically with row of setulae along anterior margin, setulae becoming progressively longer ventrally, 1 dorsal, erect setula. |
| Presternum with 1 or 2 inconspicuous setulae on each half of sclerite. |
| Morphologically, D. helvetica possesses some diagnostic characters pertained to the affinis subgroup, e.g., very small distal sex-comb, 6 rows of acrostichal setulae. |
| Calypter yellowish with dense brownish microtrichae, margin with thin, sparse long setulae. |
| Three strongly developed katepisternal setae of approximately the same length, forming an equilateral triangle with three weak setulae inside the triangle. |
