Submission - 18/11/2019

Sighting - 2019-11-10

Species Seen Heterarthrus vagans (a sawfly)
Scientific Name
Recorder Rob Randall
Record Status Confirmed
Identifier Rob Randall
Identified on 18/11/2019
Location ST753643
Phase Pupa or prepupa
Locality Widcombe
Parish Widcombe, Bath
Habitat Leaf-mines on Italian Alder (Alnus cordata)
Notes This species is apparently the only European sawfly that mines the leaves of Alder trees and pupates in the mine. The circular puparium is very distinctive and the yellowish inhabitant can be clearly seen. The leaves have been kept in the hope that adults can be reared.