Distribution: Diplectrona felix is distributed in Western and Southern Europe and on the Balkan.

Habitat: Larvae exclusively occur in springs, rivulets and small rivers that keep a low water temperature during the summer months (Botosaneanu & Malicky 1978, Robert & Wichard 1994, Edington & Hildrew 1995, Waringer & Graf 1997). The species does not tolerate organic pollutions (Pitsch 1993).

Adults: Adults are present from June to August (Waringer & Graf 1997).