Myelois circumvoluta

Myelois circumvoluta, the thistle ermine, is a small moth species of the family Pyralidae. It is found in Europe.

Thistle ermine
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Pyralidae
Genus:	Myelois
Species:	M. circumvoluta
Binomial name
Myelois circumvoluta (Fourcroy, 1785)
Synonyms
Tinea circumvoluta Fourcroy, 1785 Myelois cribrella Tinea cribrella Hübner, 1796 Myelois britannicella Amsel, 1951 Phalaena cardui Haworth, 1811

This pyralid has a pattern of black dots on its whitish forewings, resembling many ermine moths (family Yponomeutidae). Among the Lepidoptera, the pyralids and the ermine moths are not closely related, however: the latter are basal Ditrysia, while the former belong to the much more advanced Obtectomera.

The wingspan is 27–33 millimetres (1.1–1.3 in). The moth flies in one generation in late spring to early summer, e.g. from the end of May to June in Belgium and the Netherlands.

Figs.3, 3a larvae in various stages of growth, 3b bored thistle stems showing exit hole

The caterpillars feed on Cardueae (Cynareae) thistles – greater burdock (Arctium lappa), cotton thistle (Onopordum acanthium), and Carduus and Cirsium species.