Species Account

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Summary Data

Season (Adult / Immature):

National Status: Local

Local Status: Fairly common and thinly distributed resident.

Local Record: Grade 1   See here for explanation

Flight time: One generation, May-Jun.

Forewing: 9-11mm.

Foodplant: Lime, Oak, Various broad-leaved trees

IMPORTANT - Please note that the maps and accounts are provisional, subject to change and further update.  The whole dataset still needs to go through the final verification process and it is likely that a very small number of records will not satisfy the present requirements and there are other records that have not been formally submitted.  The information is for guidance only.

Record breakdown:

Year first recorded195519871955
Year last recorded201120112011
Number of records789621702
Number of individuals1244872662
Unique positions16210344
Unique locations1289274
Adult records705601530
Immature records102

For the region, we have a total of 1702 records from 274 sites. Earliest record on file is in 1955.


2078 Least Black Arches 03
© Will Bown, May 2016
2078 Least Black Arches 02
© Tom Morris
2078 Least Black Arches 01
© Terry Box, 20 May 2004

Species Account

For further information refer UK Moths.

Davey, P., 2009: A local species in Britain, the larva feeding on lime (Tiliae spp.), oak (Quercus spp.), and evergreen oak (Quercus ilex). In Dorset, the moth is local and occurs in old deciduous woodland containing oak and small-leaved lime (Tiliae cordata), and in coastal localities where evergreen oak (Quercus ilex) grows, for example in Poole, Bournemouth and at Durlston. The moth is frequent at West Bexington where none of its stated foodplants grow, and in this locality blackthorn (Prunus spinosa) is a potential host food plant.

See background to species accounts.  Index of Vernacular names - Search - Random Species