Figures 11-22 in Heleniella helvetica sp. n., a cold stenothermic species inhabiting the upper Rhône catchment in central Switzerland [Diptera, Chironomidae, Orthocladiinae]

Figures 11-22. Male imago of Heleniella spp. Heleniella helvetica sp. n.: anal point and distribution pattern of setae on tergite IX (11); virga (12); right gonostylus, dorsal (13); left gonostylus, ventral (14); inferior volsella and gonostylus, dorsal (15). H. sp. 1(central Switzerland): tergite IX lacking anal point (16); virga, two aspects (17-18); phallapodeme (19); right gonostylus (20). H. extrema:p hallapodeme, after Albu (1972, Figure 2) (21); left gonostylus, dorsal, after Albu (1972, Figure 2) (22).