The gall is a short or long downward, hairless, roll containing one or several yellowish-red or orange larvae.

The galls are of varying lengths, often run together and often have orange, red or white patches.

[2] According to Redfern et al (2011) the gall is only found on S. viminalis in Great Britain.

[3] The insect has been found in Armenia, Germany, Great Britain, Lithuania, the Netherlands, and Sweden.

This article related to members of the fly infraorder Bibionomorpha is a stub.