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1458 ~ Myelois circumvoluta ~ Thistle Ermine
UK Status

Resident. Locally common throughout the southern half of Britain.

Montgomeryshire Status

Only a single record from the east of the county near Welshpool in 1961 until one was trapped at Middletown in 2010, where it has since been found to be locally common.

Wingspan :   M & F, 27-33mm.

Confusion species

Similar to Yponomeuta spp. but much larger.
Flight time & Voltinity (Univoltine)


Chalk downs and light sandy soils.


Thistle spp.

Lifestage data

Stem feeder. Eggs laid on foodplant. Larva first feeds in flower heads, later burrowing down into pith of the stem, several galleries can be found in a single stem. Pupates in a cocoon in the stem.
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Montgomeryshire photos

Photo by DB, 9th June 2014, Middletown