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Caloptilia alchimiella
Yellow-triangle Slender (Scopoli, 1763)
Gracillariidae: Gracillariinae
286 / 15.008
Photo © Dave Appleton,  31/08/2015 - North Elmham - male (gen det)

Similar Norfolk Species
New Oak Slender
Caloptilia robustella
Wingspan: 10-13mm
Flight: May - July (possibly as two separate broods)
Foodplant:   Oak
Nat Status: Common
Verification Grade:  Adult: 4  Mine: R
Norfolk Status
Difficult to distinguish from the recently separated C. robustella

please record undetermined specimens as the aggregate Caloptilia alchimiella/robustella



Leaf-mine: July - Oct.
Narrow gallery leading to a squarish or triangular blotch. Then forms up to three successive cones by folding the lobe of a leaf downwards.
Note: You cannot separate these from C. robustella unless you examine the pupa or breed out.

Determination by Genitalia Examination (gen. det.) Required

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

Recorded in 19 (28%) of 69 10k Squares.
First Recorded in 1874.
Last Recorded in 2021.

Latest 5 Records
Date#VC10k Area
02/06/2021127TG13 - Baconsthorpe
20/08/2020128TF92 - Fakenham/Ryburgh
12/08/2020128TF92 - Fakenham/Ryburgh
11/08/2020128TF63 - Snettisham/Dersingham
10/08/2020128TF92 - Fakenham/Ryburgh
Further info: Caloptilia alchimiella
 
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