“Hydrellia viridescens” Robineau-Desvoidy, 1830
Alisma probably boring in stem en petiole, from there sometimes descending into the blade. In Potamogeton a broad, shallow gallery in the submerged leaves. Pupation internal.
Alismataceae, Potamogetonaceae; narrowly polyphagous
Larvae in May till July (Hering, 1957a).
The status of this species, that is not mentioned in the Fauna Europaea (2009), is unclear.