– click for General Verification Guidelines | – click for Specific Verification Guidelines 
– Rare / Uncommon / Scarce
– care required in the identification process, as confusion with similar species is likely – quality photographs required. ID pointers: Fairly distinctive in appearance. Dark brown or greyish-brown in the forewing with scattered yellow scales and four yellow blotches varying in size.
Distribution: (Last record: 17 May 2024 at Glossop ) – Rare in Derbyshire with very few records. Not mentioned in the 1989 Harrison & Sterling Butterflies & Moths of Derbyshire.All current records are from NW Derbyshire
*** Last updated on 2 October 2025 by RP ***
Last Recorded Year: 2024
Last Recorded By – Christian Heintzen
Last Recorded General Area – Glossop
Selected Images: Linacre, Derbyshire – Peter Stoppard © / Glossop – Christian Heintzen©
Image Gallery
Distribution Map for Denisia similella
Found 10 records
↳ 2 from After 2025
↳ 7 from 2020 - 2024
↳ 1 from Before 2020
↳ 2 from After 2025
↳ 7 from 2020 - 2024
↳ 1 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.
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.
NBN Atlas UK Distribution for – Denisia similella
⚠️ 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.
Monthly Records By Year:
Denisia similella
( data includes both Larvae and Adult Stages )
Monthly Counts By Year: Denisia similella
( data is based on 'Adult' stage records only. )
First/Last Recorded Dates: Denisia similella
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: Denisia similella
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Denisia similella
AGR: 0% | Total % Change: 0%
CUSUM Analysis: Denisia similella
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: Denisia similella
( data includes both Larvae and Adult Stages )
Flight Periods – Indicative –vs– Recorded Data
Denisia similella
Denisia similella
( 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 - Denisia similella – 10 records available
Listed by Year - descending - scroll across to see all table columns
| Site Name | Tetrad | Date | Count | Stage | Source |
|---|---|---|---|---|---|
| Glossop, Gnat Hole Rough Fields | SK09L | 10/07/2025 | 1 | adult | vc57_irecords_extract |
| Derbyshire Wild Life Trust Long Clough, Herod Clough | SK09G | 11/07/2025 | 1 | adult | vc57_irecords_extract |
| Sycamore Road, Chapel-en-le-Frith | SK07P | 19/07/2024 | 1 | Adult | vc57_irecords_extract |
| Glossop, The Twitchlings | SK09M | 17/05/2024 | 1 | adult | vc57_irecords_extract |
| Birch Vale | SK08I | 15/07/2022 | 1 | adult | vc57_irecords_extract |
| Birch Vale | SK08I | 07/06/2022 | 1 | adult | vc57_irecords_extract |
| Chinley Head | SK08M | 23/07/2021 | 1 | Adult | vc57_irecords_extract |
| Birch Vale | SK08I | 06/06/2021 | 1 | Adult | vc57_irecords_extract |
| Birch Vale | SK08I | 25/05/2020 | 1 | adult | vc57_irecords_extract |
| Birch Vale | SK08I | 30/05/2018 | 1 | adult | vc57_irecords_extract |