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Dark-barred Twin-spot Carpet
Xanthorhoe ferrugata (Clerck, 1759)
Geometridae: Larentiinae
1725 / 70.052
Photo © Laura King,  25/05/2021 - Lower Hellesdon

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Similar Species
Red Twin-spot Carpet
Xanthorhoe spadicearia
Forewing: 12-13mm.
Flight: Two Generations. May-Jun. Jul-Aug.
Foodplant:   Herbaceous plants.
Red List: Near Threatened (NT)
GB Status: Common
Verification Grade:  Adult: 2
Status
Believed to be over-recorded in Norfolk.
Very similar to Red Twin-spot Carpet, which has a dark-barred form.

The notch on the inner edge of the cross-band, close to the costa, has proven to be an unreliable method to identify this species.

Red Twin-spot Carpet also has a dark-barred form, leading to confusion.
However a red-barred form of Dark-barred Twin-spot Carpet is apparently rare and should be treated as indistinguishable without dissection of the genitalia.

Using caution, only classic examples with solid black cross-bands should be assigned to this species without dissection of the genitalia.

Recorded in 65 (88%) of 74 10k Squares.
First Recorded in 1873.
Last Recorded in 2023.

Latest 10 Records
Date#VC10kArea
11/09/2023128TF63Dersingham
10/09/2023+28TL78Weeting Heath (Gravelpit Wood)
10/09/2023128TF92Stibbard
09/09/2023128TF83Syderstone
09/09/2023128TF51Walpole Highway
08/09/2023+28TL78Weeting Heath (Gravelpit Wood)
08/09/2023127TG32Neatishead / Barton Broad
07/09/2023+28TL78Weeting Heath (Gravelpit Wood)
06/09/2023127TG31Upton
05/09/2023128TL78Weeting Heath
Further info: Xanthorhoe ferrugata
 
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