The larva of the fly Amauromyza morionella mines the leaves of various Stachys and Lamium species. The frass is conspicuous in the mine and the mine is initially linear, then develops into a white blotch, often enveloping the early mine.
Where the larval host species (Stachys and Lamium sp.) are present.
The larval mines may be encountered when the host species are in leaf.
True status in Britain is difficult to determine due to lack of records.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015