49.211 BF1128  –  Tortricidae –  Olethreutinae – Ancylis myrtillana – Bilberry Hook-wing – (Treitschke, 1830) Adult Micro:  CAT 1 – Distinctive Species –       PDF Icon – click for General Verification Guidelines  |   PDF Icon – click for Specific Verification Guidelines
Green –  Rare / Uncommon / Scarce   
Taxonomy:   Micro   >>  Tortricidae  >> Olethreutinae
** Identification write up required **
Other Name/s: Bilberry Roller
ID Difficulty:  green  – easy to identify, generally distinctive and unlikely to be confused with other species.
Distribution:  (Last record: 2 May 2025 at Glossop )  –  Harrison & Sterling described this species as Common and widely distributed across the high upland moors containing Bilberry. Since 1986 very few records – DaNES 3 in 1994 1 in 2010 & 1 in 2011. iRecord – one from Hathersage,25/6/2019 & one from Errwood/Fernilee Reservoirs 19/5/2019.1 recorded 2nd May 2025 from heather moorland above Glossop. Most likely being under recorded due to very little field trapping on the high moors.
Flight Period: May /  June /  July /  –  May-July flies in afternoon sunshine and from dusk onwards Moth Activity: Cathemeral   – and is attracted to light Photographed: Yes –  Photographed By: The late Claire Miles, Christian Heintzen  © All Rights Reserved
*** Last updated on 7 May 2025 by RP ***
Wingspan: 14mm
Food Plant: Bilberry and Bog Bilberry
Last Recorded Year: 2025
Last Recorded By – Christian Heintzen
Last Recorded General Area – Glossop

IMAGES BELOW:  

Hathersage (2019) The late Claire Miles© / Glossop (2025 Christian Heintzen©

Distribution Map for Ancylis myrtillana

Found 13 records
    ↳ 3 from After 2025
    ↳ 1 from 2020 - 2024
    ↳ 9 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 – Ancylis myrtillana

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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: Ancylis myrtillana
( data includes both Larvae and Adult Stages )

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


First/Last Recorded Dates: Ancylis myrtillana
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: Ancylis myrtillana
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Ancylis myrtillana
AGR: 12.26%   |   Total % Change: 466.7%


CUSUM Analysis: Ancylis myrtillana
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 20 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 8 (August) 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 2025, reaching above average levels. The lowest population point occurred near 2024, 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: Ancylis myrtillana
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Ancylis myrtillana
( 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.

Records Behind the Map and Charts - Ancylis myrtillana – 13 records available

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

Site NameTetradDateCountStageSource
Glossop, Black MoorSK09R06/05/202515adultvc57_irecords_extract
Longdendale, Wildboar Clough WoodlandSK09U20/05/20251adultvc57_irecords_extract
Glossop, Moorfield, Wood's CabinSK09L30/04/20251adultvc57_irecords_extract
Black Edge, DoveholesSK07T21/05/20241Adultvc57_irecords_extract
Hathersage, Derbyshire, UKSK28F25/06/20191adultvc57_irecords_extract
Errwood/Fernilee ReservoirsSK07C19/05/20191othervc57_irecords_extract
Derbyshire, UKSK08U21/05/20141Adultvc57_irecords_extract
Beeley Moor, BeeleySK26Y06/05/20111Adultvc57_danes_bc_data
Biggin Dale, nr HartingtonSK15P12/06/20101Adultvc57_danes_bc_data
Slagmill Plantation, Beeley Moor (site not precise)SK36E14/06/19941Adultvc57_danes_bc_data
Linacre top resr, Chesterfield (site not precise)SK37G01/06/19941Adultvc57_danes_bc_data
Slagmill Plantation, Beeley Moor (site not precise)SK36E09/06/19941Adultvc57_danes_bc_data
Gladwins Mark, BeeleySK36D07/06/19641Adultvc57_danes_bc_data

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