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Luminary Oddities · Natural history & art

Pygmy Moth

Thyris fenestrella

Lepidoptera / Thyrididae

Thyris fenestrella is a small, day-flying moth with transparent windows in its dark wings. It inhabits warm, sunny clematis-covered slopes; its larvae shelter in folded leaf tips.

Read the species account
Thyris fenestrella, dorsal view
Pygmy MothDorsal view.Illustration adapted from File:Thyris fenestrella MHNT.CUT.2012.0.357 Claix (Isère).jpg by Didier Descouens. CC BY-SA 3.0. Illustration licensed under CC BY-SA 3.0.

At a glance

Wings ↘
Two transparent areas occur in each dark wing. [1]
Host ↘
Larvae feed on Clematis vitalba. [1]
Shelter ↘
Caterpillars wrap leaf tips around their feeding sites. [1]

Identity and classification

Thyris fenestrella (Scopoli, 1763) belongs to Thyrididae. Adults span approximately 12–15 mm. [1][2]

Morphology and identification

Black and dusky-brown wings carry yellowish or orange dots. Two transparent patches, separated by a narrow dark strip, interrupt each wing. [1]

Distribution and habitat

The species favours warm, sunny slopes with clematis, often over calcareous soils. A 2015 record from Janowiec in eastern Poland came from a south-facing Vistula Valley slope. [1]

Life cycle

Of the offspring reared from a pair captured in Poland on 8 May 2015, one female emerged on 28 June and six other pupae overwintered. This demonstrates partial direct development under the rearing conditions. [1]

Feeding and host plants

Clematis vitalba is a principal larval food plant. The Janowiec study also documented an egg on Clematis recta. [1]

Behaviour

A male and female were observed feeding on blooming hawthorn by day at Janowiec on 8 May 2015. [1]

Distinctive biology

Caterpillars make characteristic shelters by wrapping leaf tips. The larvae have a dark-yellow body, a brown head and numerous black warts. [1]

Artistic interpretation

Display and care

Keep the enclosure closed and display it in indirect light, away from heat and damp conditions. Handle the frame by its edges and clean only its exterior according to the maker’s instructions.

Sources and further reading

  1. Confirmation of the occurrence of Thyris fenestrella (Scopoli, 1763) (Lepidoptera:Thyrididae) in Poland and remarks about its biology ↗

    Dawidowicz; Zoologica Poloniae 60(1):5–9 (2015) · Accessed 2026-10-13

  2. Thyris fenestrella genomic and transcriptomic data ↗

    Wellcome Sanger Institute; NCBI BioProject · Accessed 2026-10-13

Sources checked 2026-10-13. Illustrations · Luminary Oddities.

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