genus includes several species, which cannot be separated in their
larval stage at present.
Hydroptila spp. is widely distributed in Europe and in
European Russia (Malicky 2004).
The larvae occur in running waters or in the littoral of lakes and
ponds (Waringer & Graf 1997).
Larvae feed on filamentous algae by breaching the cell walls and
sucking out the semi-fluid contents (Malicky 1973, Waringer &
Graf 1997, Graf et al. 2002).