Round-winged Muslin

Thumatha senex

This record describes Thumatha senex (species). Recorded family: Erebidae. Recorded order: Lepidoptera.

Identification and Appearance

Wingspan 15 to 20 mm. The sparsely scaled wings of this moth give it a thin, papery appearance. The adults fly in July and August, and are attracted by light. The larvae feed on lichens, especially dog lichen, as well as various mosses. Distributed widely, though not commonly, throughout a large part of Britain, it is scarcer in Scotland and Ireland. In a recent survey to determine the status of all macro moths in Britain this species was classified as local.

Classification

Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Erebidae
Genus: Thumatha

Imported taxonomy record. Source availability varies; see the source references and editorial policy below.

Habitat and Range

Habitat

Inhabits marshes and fenland.

Seasonal Activity

The adults fly in July and August, and are attracted by light.

Diet and Behavior

Life History

The larvae feed on lichens, especially dog lichen, as well as various mosses.

Additional species information

Recorded status

Distributed widely, though not commonly, throughout a large part of Britain, it is scarcer in Scotland and Ireland. In a recent survey to determine the status of all macro moths in Britain this species was classified as local.

About Butterflies and Moths: the wider group

Order-level background for Lepidoptera, the group containing Thumatha senex. Species-specific details appear above.

Group overview

Lepidoptera includes approximately 180,000 described species of butterflies and moths. Moths outnumber butterflies roughly 10:1. The monarch butterfly's eastern population has declined by more than 80% since the mid-1990s, and the western population by over 95% since the 1980s. The IUCN lists the migratory monarch as Vulnerable.

Ecological role of the group

Butterflies and moths are essential indicators of ecosystem health. As caterpillars, they are a primary food source for birds - a single nest of blue tit chicks requires ~10,000 caterpillars. Adult moths pollinate many night-blooming plants.

Economic and practical significance of the group

Lepidoptera are critical pollinators. In Europe, grassland butterfly species have declined by almost 50% since the early 1990s. In the UK, three-quarters of butterflies are in decline. In the U.S., five butterfly species have gone extinct since 1950, with 29 listed as endangered.

Recorded sources for this group: IUCN Red List, Xerces Society, USFWS, PNAS, WWF. Imported estimates may describe particular regions or reporting periods.

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