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72.037 (BF2035)

Round-winged Muslin   

Thumatha senex
Adult: 2
Resident. Rare.


Fairly unmistakable. Due to its rarity status specimen or quality photo required for record acceptance.

Life cycle

One generation. Overwinters as a small larva, during August to May, with pupation close to the ground in a cocoon.

Larval foodplants

Unknown, but probably lichens, mosses and algae on marsh plants.


Fens, damp grassland, wetter areas on moorland, marshes and coastal dunes.

History 1860-2010

The first records came in July, 1981, from the Waterside Mains Rothamsted station at Keir, where it was recorded on six occasions. During 1987-92 at the Mabie Forest station, it was recorded a dozen times.

It then occurred thrice at Auchencairn, 2003, 2007 and 2009, with further sightings from Kirriereoch in 2007, Galloway Farm (VC74) in 2008, and in 2009 at Low Kirkbride Farm (VC73) and between Dunscore and Low Kilbride (VC72).

Waring et al. only mentions it for the lowlands between Forth and Clyde.

48 record(s) from 13 hectad(s) in D&G

VC74 VC73 VC72
Last recorded 2008 2022 2021

 UK Moths website - further information on species (with photos)

 East Scotland Butterfly Conservation website - national distribution maps and phenology

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