Diamesa goetghebueri Pagast, 1947

Montagna, Matteo, Urbanelli, Sandra & Rossaro, Bruno, 2016, The species of the genus Diamesa (Diptera, Chironomidae) known to occur in Italian Alps and Apennines, Zootaxa 4193 (2), pp. 317-331 : 322

Diamesa goetghebueri Pagast, 1947

( Fig. 2 C, D)

The species is not easily distinguished from D. lindrothi (see above). It could be suspected that the digitiform ( D. lindrothi ) or flat ( D. goetghebueri ) aspect of dorso-lateral lobe of inferior volsella ( Fig. 2 ) depends on the angle of visualization. However, an accurate examination of many specimens from Estellette and Adamello glacial streams, with the male genitalia rigorously mounted in the same dorsal position, confirms the presence both of a digitiform and a flat dorso-lateral lobe and supports the separation of two species (see figures). According to Serra-Tosio (1973), D. goetghebueri is endemic from the Alps ( Rossaro & Lencioni 2015a, b).

Figures

FIGURE 2. A, Diamesa lindrothi Goetghebuer in Goetghebuer & Lindroth, inferior volsella with dorso-lateral and ventromedial lobes; B I, anal point, B II, male genitalia, B III, inferior volsella dorso-lateral lobe, B IV, inferior volsella ventromedial lobe; C, Diamesa goetghebueri Pagast, inferior volsella with dorso-lateral and ventro-medial lobe; D I, anal point, D II, male genitalia, D III, inferior volsella dorso-lateral lobe, D IV, inferior volsella ventro-medial lobe.