Diamesa lindrothi Goetghebuer in Goetghebuer & Lindroth, 1931

(Fig. 2 A, B)

The examination of genitalia of many adult males suggests that in the Alps there are transition forms between this species and D. goetghebueri . The species D. lindrothi has a digitiform dorso-lateral lobe of inferior volsella (Fig. 2 A, B), while in D. goetghebueri the lobe is larger and flat (Fig. 2 C, D). According to Serra-Tosio (1973) this species is distributed throughout the Scandinavian Peninsula, but it is also present in the Alps. Examining larvae with barcode analysis confirms the existence of at least two separated species under this name in the Alps (Montagna et al. 2016).