Description: Wingspan 19-23mm. Adults are small with pale brownish-grey forewings. The veining is dark-coloured and the wings are lightly scaled, giving a transparent look to the adult moth when at rest. The crosslines consist mainly of weak grey-coloured dots. The discal spots on the forewings are pale and weakly defined. From the end of June until late July, occasionally into early August in some years.

World Distribution: Throughout northern and central Europe as far east as Asia Minor.

Irish Distribution: Widely distributed throughout the southern half of the province, especially in Down and Fermanagh. Donovan considered this species as being common and locally distributed, a view not shared by Baynes, who claimed to have records for all counties in the north. Recent recording since the early 1990s has shown this species to be widespread in suitable habitat.

Ecology: A small species associated with open woodland, bogs and rocky habitats. Adults are attracted to light in small numbers. This species closely resembles the Round-winged Muslin Thumatha senex and may occasionally be confused with this species. The larvae feed on various species of lichens found growing on stone walls and small trees. It overwinters as a larva.

Key Identification Features:

• Small size
• Transparent appearance of the adult.
• Less rounded forewings
• Poorly defined discal spots

Distribution Map from NBN: Nudaria mundana at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Nudaria mundana at iNaturalist World Species Observations database.