Xestophanes brevitarsis


Xestophanes brevitarsis is a gall wasp that causes galls to form on Tormentil (Potentilla erecta) and Trailing Tormentil (Potentilla anglica). The galls are seen more often than the adult. Galls are usually found on the aerial stem or sometimes at the root and take the form of rounded swellings, 2 to 3 mm across, often several in a group and sometimes coalesced. They are green or pink at first, becoming brown and hard.

Identification difficulty

Adult Gall


Where Tormentil (Potentilla erecta) and Trailing Tormentil (Potentilla anglica) are present.

When to see it

Galls appear in summer and autumn.

UK Status

Infrequently recorded in Britain.

VC55 Status

Rare or under recorded in Leicestershire and Rutland. The Charnwood Lodge record of 17th September is believed to be the first record of this species in VC55.

be our species champion

Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map