Caloptilia azaleella       Caloptilia alchimiella/robustella
15.008 BF286  –  Gracillariidae –  Gracillariinae – Caloptilia alchimiella – Oak Stilt – (Scopoli, 1763) Adult Micro:  CAT 4 – Gen. Det. Required – Gen-Det-Reqd       Leaf-miner:  CAT L – The leaf or a Photo required – reared and possibly dissected       PDF Icon – click for General Verification Guidelines  |   PDF Icon – click for Specific Verification Guidelines
Black – Uncertain/Unknown – Insufficient Data        purple – Leaf Miner
Taxonomy:   Micro   >>  Gracillariidae  >> Gracillariinae
Other Name/s: Yellow-triangle Slender
ID Difficulty:  Red – difficult to identify – detailed examination required, often a Gen Det and/or specimen and quality photographs are required.
Confusion Species: Caloptilia robustella (Shaded Oak Stilt)
ID pointers: The forewing is orange-brown or orange-yellow or brown-yellow in colour with an obvious yellow triangular patch in the centre of the costa extending towards the dorsum, giving the moth a distinctive appearance. Hence the old name of Yellow-triangle Slender. The adult moth cannot be told apart form C.robustella without examination of the pupa or breeding out.
Distribution:  (Last record: 8 June 2015 at Ripley )  –  Uncertain/Unknown due to lack of qualified records. Due to the recently separated C.robustella, the two are difficult to tell apart
Records exist from 1973 Shipley Park and West Hallam; 6/8/2015 Ripley – three recent records are aggregated.
Flight Period: May /  June /  July /  –  Possible two generations between May – July Mine Period: July /  August /  September /  October /   – The larvae mine the leaf first of all in a narrow gallery, that leads to a triangular or square blotch. The larvae then form a series of cones by folding the lobe of the leaves downwards Moth Activity: Cathemeral   – and is attracted to light Photographed: No –  Photographed By: Not Recorded
*** Last updated on 6 May 2025 by RP ***
Wingspan: 10-13mm
 Food Plant: Oak
Last Recorded Year: 2015
Last Recorded By – Not Recorded
Last Recorded General Area – Ripley
IMAGES BELOW:  

no images were found

Distribution Map for Caloptilia alchimiella

Found 4 records
    ↳ 0 from After 2025
    ↳ 0 from 2020 - 2024
    ↳ 4 from Before 2020

If the Map Layers function fails, just refresh the page and it should be OK after. Use the +- zoom on the top left, or on a tablet, use two fingers to zoom. Remember, the last layer you ticked is the one which displays the popup information - they sit on top of each other - de-select then re-select, to see the popup values.

******* Choose ONLY one at a time, of either Monad, Tetrad or Hectad Distribution - each has it's own set of data. Also, the distribution maps cover ALL recorded data. *******

Bedrock Geology ** indirectly affects moth distribution by influencing the type of habitat and food plants available in an area. In turn, this may affect the types of moths that can thrive, or where they can most likely be found.

Land-cover * shows the variety of land-cover within the VC57 area, based on the CORINE (Coordination of Information on the Environment) forty-four thematic classes of land-cover. This will show, to a greater or lesser degree, the number and variety of moths found in different land-cover types. The UK continues to operate within the Copernicus programme, with the UK Centre for Ecology & Hydrology (UKCEH) providing Corine Land Cover (CLC) datasets for the UK and its territories.


NBN Atlas UK Distribution for – Caloptilia alchimiella

⚠️ Please wait for the map to load fully – do not click the link shown.


Note – the NBN Atlas datasets are listed in the map below and vary in their currency (uptodateness) – however, the map does give a general indication of the moth's distribution across the UK.

Visit NBN Site


Monthly Records By Year: Caloptilia alchimiella
( data includes both Larvae and Adult Stages )
No data returned from the database.

Monthly Counts By Year: Caloptilia alchimiella
( data is based on 'Adult' stage records only. )


First/Last Recorded Dates: Caloptilia alchimiella
Adult-only & Anything [Larvae, Pupae, Adult, Mines]

Shading shows moth presence between dates

Click the colour discs below to Select/De-select as Required

Recordings By Year: Caloptilia alchimiella
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Caloptilia alchimiella
AGR: 0%   |   Total % Change: 0%


CUSUM Analysis: Caloptilia alchimiella
About this chart: CUSUM (Cumulative Sum) charts track long-term trends in moth populations [ filtered by 'Adult' and 'Mine' life stages ] by showing whether each year’s counts are above or below the historical average. Even small shifts build up over time, making trends of growth, stability, or decline easier to see. CUSUM highlights trend-consistency — asking: “Across the years, have moth counts mostly stayed above or below average?”
The data sample has 23 gap year/s here (zero records) between 2000 and 2025. The moth may have been present in those gap years, but no data was available. Too many year-gaps may exaggerate or skew the chart.

Counts for the current year (2025) are pro-rated based on data available up to month 7 (July) to provide a full-year equivalent.

ⓘ Purple line rises = years better than average; falls = years worse than average.
Peak (best year) Trough (worst year) Growth periods Decline periods
Population peaked around 2004, reaching above average levels. The lowest population point occurred near 2004, showing a significant decline.

What the Y-axis "Cumulative Deviation" means: Cumulative Deviation shows the running total of how each year’s moth population count differs from the long-term average. i

Hectad (10kmx10km) Coverage: Caloptilia alchimiella
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Caloptilia alchimiella
( data includes Adult Stage only )

Flight Period chart – the grey hatched area above, which can cross one or more months, pictorially represents the best guess we have for this moth's flight periods [month/s]. The coloured lines represent the actual months seen in flight, from site observation records received between 2020-2025.

Mine Periods – Indicative –vs– Recorded Data
Caloptilia alchimiella
( data includes both Larvae and Adult Stages )

Mine Period chart – the grey hatched area above, which can cross one or more months, pictorially represents the best guess we have for this moth's mine periods [month/s]. The coloured lines represent the actual months seen mining, from site observation records received between 2020-2025.

Records Behind the Map and Charts - Caloptilia alchimiella – 4 records available

Listed by Year - descending - scroll across to see all table columns

TaxonSite NameTetradYearDateCountStageSource
Caloptilia alchimiellaLadycroft AveSK07S201305/07/20131adultvc57_irecords_extract
Caloptilia alchimiellaAlfreton Park, AlfretonSK45C200829/08/20081Adultvc57_danes_bc_data
Caloptilia alchimiellaWood Lane,Newhall,SwadlincoteSK22V200430/07/20041Adultvc57_danes_bc_data
Caloptilia alchimiellaDeerlands Rd, Ashgate, ChesterfieldSK37K199304/07/19931Adultvc57_danes_bc_data

Caloptilia azaleella       Caloptilia alchimiella/robustella

Copyright Tony Davison © 2025 www.derbyshiremoths.org

Scroll to Top