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Caloptilia semifascia
Maple Slender (Haworth, 1828)
Gracillariidae: Gracillariinae
290 / 15.012
Photo © Andreas Beaumont,  07/05/2018 - Catfield - Woodhurst

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Similar Norfolk Species
Pale Red Slender
Caloptilia elongella
Small Red Slender
Caloptilia rufipennella
Wingspan: 10-12mm
Flight: Sept - May (hibernates)
Foodplant:   Field Maple, Sycamore, Silver Maple, Norway Maple
Nat Status: Local
Verification Grade:  Adult: 2  Mine: R
Norfolk Status

Now thought to be bivoltine in some counties including Norfolk with two distinct forms for each brood.
The Summer brood showing a triangular costal blotch while the Autumn (hibernating) second brood shows a distinctive angled light streak starting at the leading edge of the forewing.

Leaf-mine: June-July
gallery leading to a squarish blotch, later forming up to 3 leaf tubes/cones.

On Sycamore, the feeding signs can also be confused with those of C. rufipennella and will need rearing to confirm.

Scattered VC27 records. First confirmed VC28 record in 2013 when cones were collected on Silver Maple at Lynford Arboretum and bred through. This is thought to be a new foodplant record for this species. (I. Barton, K. Rosewarne)

[MBGBI Vol2 p268]

Please note:

The rare C. hemidactylella (Recorded in Suffolk, not yet recorded in Norfolk) can only be separated as mines from C. semifascia by rearing through.

Morphology and DNA barcodes show that Calybites hauderi does not occur in the British Isles, but are the first brood of bivoltine Caloptilia semifascia. (Langmaid et al. 2011. Nota Lepidopterologica 33, 191-197).

Mine: Moth needs to be reared and, in some cases, possibly dissected.

Recorded in 40 (58%) of 69 10k Squares.
First Recorded in 1874.
Last Recorded in 2021.

Latest 5 Records
Date#VC10k Area
26/07/2021128TF50 - Upwell/Marshland
09/05/2021227TG13 - Baconsthorpe
08/05/2021127TG13 - Baconsthorpe
08/05/2021127TG30 - Brundall/Cantley
01/04/2021127TG23 - N.Walsham/Roughton
Further info: Caloptilia semifascia
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