Pond dipping

Whilst looking for a rare Coleophora in Norfolk on New Years Day I noticed some reedmace with damage to the seedheads (see below).

This rang a vague bell about 898 Limnaecia phragmitella so I picked a seedhead to have a look for larvae. I expected the larvae to be hidden within the seedhead but they were feeding on the outside. This species will feed on both Common and Lesser Reedmace.