– click for Adult Macro Verification Guidelines
– Rare / Uncommon / Scarce
– care required in the identification process, as confusion with similar species is likely – quality photographs required. ID pointers: The forewing is very broad and rounded, brown or greyish brown in colour. The moth can be very delicately marked and marbled with pink. There are usually two dark central cross bands and both wings are scalloped along the outer edges. In fresh individuals they have a pinkish almost purplish tint to them and look very silky in appearance.
Distribution: (Last record: 23 July 2025 at Torside, Longdendale ) – A resident that is widely distributed and locally common in north-west Derbyshire. Mainly recorded, from a number of well known tunnels, during winter months when the moth is hibernating. Few records from light traps.
*** Last updated on 2 October 2025 by RP ***
Forewing: 19-22mm
Last Recorded Year: 2025
Last Recorded By – Christian Heintzen
Last Recorded General Area – Torside, Longdendale
Selected Images: Image by Steve Orridge © / Torside (2025) Christian Heintzen©
Image Gallery
Distribution Map for Triphosa dubitata
Found 68 records
↳ 4 from After 2025
↳ 16 from 2020 - 2024
↳ 48 from Before 2020
↳ 4 from After 2025
↳ 16 from 2020 - 2024
↳ 48 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 – Triphosa dubitata
⚠️ 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:
Triphosa dubitata
( data includes both Larvae and Adult Stages )
Monthly Counts By Year: Triphosa dubitata
( data is based on 'Adult' stage records only. )
First/Last Recorded Dates: Triphosa dubitata
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: Triphosa dubitata
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Triphosa dubitata
AGR: 5.66% | Total % Change: 275%
CUSUM Analysis: Triphosa dubitata
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 10 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 2013, 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: Triphosa dubitata
( data includes both Larvae and Adult Stages )
Flight Periods – Indicative –vs– Recorded Data
Triphosa dubitata
Triphosa dubitata
( 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 - Triphosa dubitata – 68 records available
Listed by Year - descending - scroll across to see all table columns
| Site Name | Tetrad | Date | Count | Stage | Source |
|---|---|---|---|---|---|
| Longdendale, Torside Clough, Crags at m | SK09T | 22/07/2025 | 1 | adult | vc57_irecords_extract |
| Monsal Trail Derbyshire | SK17R | 10/03/2025 | 6 | adult | vc57_irecords_extract |
| Crabtree Wood mine, Barlborough CP | SK47Z | 02/02/2025 | 6 | adult | vc57_irecords_extract |
| Monsal Trail Tunnels , Derbyshire | SK17Q | 19/01/2025 | 2 | adult | vc57_irecords_extract |
| Great Longstone | SK17R | 25/11/2024 | 9 | adult | vc57_irecords_extract |
| Monsal trail tunnels. | SK17R | 25/11/2024 | 9 | adult | vc57_irecords_extract |
| Longdendale, Wildboar Clough Woodland | SK09U | 01/11/2024 | 1 | adult | vc57_irecords_extract |
| Poole's Cavern | SK07L | 24/04/2024 | 1 | adult | vc57_irecords_extract |
| Hulme End, Buxton SKHQ, UK | SK15J | 09/01/2024 | 1 | Adult | vc57_irecords_extract |
| Odin Mine, Castleton, Derbyshire | SK18G | 21/12/2023 | 1 | adult | vc57_irecords_extract |
| Longdendale, Wildboar Clough | SK09U | 07/10/2023 | 2 | adult | vc57_irecords_extract |
| Stoney Middleton | SK27H | 19/09/2023 | 5 | adult | vc57_irecords_extract |
| Ladycroft Ave | SK07S | 03/09/2023 | 1 | adult | vc57_irecords_extract |
| Stonebroom | SK45E | 15/08/2023 | 1 | adult | vc57_irecords_extract |
| Headstone tunnel , Monsal Dale , Derbyshire | SK17V | 12/03/2023 | 2 | adult | vc57_irecords_extract |
| Derbyshire , Monsal `Headstone Tunnel` and `Cressbrook Tunnel` location of Brown Long-eared Bat. | SK17R | 23/01/2023 | 1 | adult | vc57_irecords_extract |
| Buxton SK, UK | SK07S | 18/07/2022 | 1 | Adult | vc57_irecords_extract |
| Ferneydale Avenue | SK07Q | 27/03/2022 | 1 | adult | vc57_irecords_extract |
| Middleton by Youlgreave | SK16W | 27/04/2020 | 1 | adult | vc57_irecords_extract |
| Chapel House, Middleton by Youlgreave | SK16W | 28/04/2020 | 1 | adult | Danes_2019-2021 |
| Findern, Derbyshire, DEAZ | SK33A | 27/08/2019 | 1 | adult | vc57_irecords_extract |
| Belper | SK34N | 20/04/2019 | 1 | adult | vc57_irecords_extract |
| Derbyshire, UK | SK15N | 27/08/2018 | 1 | Adult | vc57_irecords_extract |
| [sensitive record, location hidden] | SK36L | 19/08/2017 | 1 | not recorded | vc57_irecords_extract |
| Crabtree Wood (old mine), Pebley, Barlborough | SK47Z | 21/01/2017 | 9 | Adult | vc57_danes_bc_data |
| Biggin Dale | SK15N | 22/11/2015 | 5 | adult | vc57_irecords_extract |
| Wolfscote Dale | SK15J | 22/11/2015 | 1 | adult | vc57_irecords_extract |
| Pleasley Pit (run-offs), Pleasley | SK46X | 09/05/2014 | 1 | Larvae | vc57_danes_bc_data |
| Ladycroft Ave | SK07S | 06/10/2013 | 1 | adult | vc57_irecords_extract |
| Hartington (station quarry) | SK16K | 27/09/2013 | 1 | Adult | vc57_danes_bc_data |
| Oaks Barn Cottage, Monyash Rd, Over Haddon, Bakewell | SK26D | 11/09/2010 | 1 | Adult | vc57_danes_bc_data |
| Dronfield Woodhouse | SK37J | 18/04/2010 | 1 | adult | vc57_irecords_extract |
| Buxton SK, UK | SK07S | 19/09/2008 | 1 | Adult | vc57_irecords_extract |
| Buxton SK, UK | SK07S | 19/09/2008 | 1 | Adult | vc57_irecords_extract |
| Buxton SK, UK | SK07S | 19/09/2008 | 1 | Adult | vc57_irecords_extract |
| Ladycroft Ave,Buxton | SK07S | 07/07/2008 | 1 | Adult | vc57_danes_bc_data |
| Dovedale | SK15K | 10/08/2007 | 2 | Adult | vc57_danes_bc_data |
| Clough Wood | SK26Q | 28/08/2006 | 1 | Adult | vc57_danes_bc_data |
| Hopton Wood Quarry,Cromford | SK25T | 07/06/2006 | 14 | Larvae | vc57_danes_bc_data |
| Carvers Rocks, Hartshorne, Swadlincote | SK32G | 12/05/2006 | 1 | Adult | vc57_danes_bc_data |
| Carvers Rocks, Hartshorne, Swadlincote | SK32G | 12/05/2006 | 1 | Adult | vc57_danes_bc_data |
| Armitage Drive, Long Eaton | SK53B | 17/07/2002 | 1 | Adult | vc57_danes_bc_data |
| Beeley Moor, Beeley | SK26Y | 25/08/2001 | 1 | Adult | vc57_danes_bc_data |
| Beeley Moor, Beeley | SK26Y | 25/08/2001 | 1 | Adult | vc57_danes_bc_data |
| Miller's Dale | SK17L | 14/08/1994 | 1 | Adult | vc57_danes_bc_data |
| Lang Rd, Alvaston, Derby | SK33R | 23/07/1992 | 1 | Adult | vc57_danes_bc_data |
| Pond House, Mapperley Res, Ilkeston | SK44G | 07/05/1988 | 1 | Adult | vc57_danes_bc_data |
| Pond House, Mapperley Res, Ilkeston | SK44G | 07/05/1988 | 1 | Adult | vc57_danes_bc_data |
| Dovedale (site not precise) | SK15K | 02/06/1984 | 1 | Adult | vc57_danes_bc_data |
| Matlock (Teacher Training College) | SK36A | 04/10/1983 | 1 | Adult | vc57_danes_bc_data |
| Matlock (Teacher Training College) | SK36A | 24/05/1983 | 1 | Adult | vc57_danes_bc_data |
| Matlock (Teacher Training College) | SK36A | 01/06/1982 | 1 | Adult | vc57_danes_bc_data |
| Threepieces, Veron Lane, Kelstedge, Ashover | SK36G | 14/05/1980 | 3 | Adult | vc57_danes_bc_data |
| Via Gellia (site not precise),Cromford | SK25N | 06/06/1977 | 1 | Adult | vc57_danes_bc_data |
| Via Gellia (site not precise), Cromford | SK25N | 06/06/1977 | 1 | Adult | vc57_danes_bc_data |
| Hopton Wood Quarry, Via Gelia | SK25S | 30/05/1975 | 1 | Larvae | vc57_danes_bc_data |
| Hopton Wood (site not precise) | SK25M | 26/05/1974 | 1 | Larvae | vc57_danes_bc_data |
| Wolds Rise, Cavendish Rd, Matlock | SK36A | 01/08/1971 | 1 | Adult | vc57_danes_bc_data |
| Rupert St, Pilsley, Tibshelf | SK46B | 03/08/1971 | 1 | Adult | vc57_danes_bc_data |
| Wolds Rise, Cavendish Rd, Matlock | SK36A | 01/08/1971 | 1 | Adult | vc57_danes_bc_data |
| Via Gellia, Cromford (site not precise) | SK25T | 21/06/1971 | 4 | Larvae | vc57_danes_bc_data |
| Hopton Wood Quarry (site not precise) | SK25M | 07/06/1970 | 1 | Larvae | vc57_danes_bc_data |
| Welbeck Rd, Bolsover | SK47V | 11/08/1969 | 1 | Adult | vc57_danes_bc_data |
| Beeley Moor, Beeley (site not precies) | SK26Z | 10/08/1968 | 1 | Adult | vc57_danes_bc_data |
| Beeley Moor, Beeley (site not precise) | SK26Z | 10/08/1968 | 1 | Adult | vc57_danes_bc_data |
| Whaley Bridge (site not precise) | SK08A | 09/04/1964 | 1 | Adult | vc57_danes_bc_data |
| Overton Hall, Ashover | SK36L | 07/02/1960 | 3 | Adult | vc57_danes_bc_data |
| Monsal Dale, Little Longstone | SK17Q | 17/08/1957 | 1 | Adult | vc57_danes_bc_data |