Diamesa laticauda Serra-Tosio, 1964

The species is very rare in the Alps. It is recorded only in few localities: Estellette glacial stream, Veny Valley (Val d’Aosta), 11IX1995, 12IX1997 ; Lys Glacial stream 30VI1987; Vedretta de la Mare (Adamello) 31VII2002. It can be easily distinguished by the expansion of the gonostylus and the large pars ventralis (Serra-Tosio 1964).