Species Details

ABH: 72.037

BF: 2035

Family: Erebidae

Subfamily: Arctiinae

Taxon: Thumatha senex

Authority: (Hübner, [1808])

Vernacular: Round-winged Muslin

Account: Local in fens, bogs, moorland, damp grassland and marshes throughout much of England The most likely confusion species is Muslin Footman Nudaria mundana, which differs in having two rather poorly-defined zigzag fasciae running across the less-rounded forewing, and fewer spots than Round-winged Muslin. Larva feeds on various lichens and various mosses.

Accounts provided by and used with the kind permission of Mike Wall, Hampshire County Moth Recorder. These will in due course be gradually replaced with species accounts with a Surrey context.

Wingspan: 20 — 22 mm

Surrey Flight Period: 10 May (2025) — 9 Aug (2015)

The flight period of overwintering adults are not given. See the flight chart below the distribution map.

Foodplant: Lichenes, Musci., Peltigera canina (a lichen).

Foodplant accounts are from the HOSTS database — Natural History Museum, London, UK. (CC0).

Status: Least Concern (LC)

UK BAP:

WCA:

Click here to view the full geology map of Surrey.

Verification Grade: 2 — Care needed to identify, an image may be required 🤔
Further Information: https://www.ukmoths.org.uk/species/thumatha-senex/
Statistics

* Based on adult records only.

Records: 125

Individuals: 123

Earliest Year: 1924

Latest Year: 2025

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