Bagous subcarinatus Gyllenhal, 1836
on Ceratophyllum
parasite
Dieckmann estimates it highly probable that the larve lives as a stem borer, but the wording by Staniec & Gosik rather suggests ectophagy.
host plants
Ceratophyllaceae, monophagous
Ceratophyllum demersum, submersum.
distribution within Europe
larva, pupa
See Staniec & Gosiek
references
Balalaikins (2012a), Behne (1981a), Bosmans (2012a), Delbol (2013a), Dieckmann (1983a), Rheinheimer & Hassler (2010a), Staniec & Gosik (2003a).