Nematopogon metaxella       Incurvaria pectinea
7.015 BF140  –  Adelidae –  Nematopogoninae – Nematopogon swammerdamella – Large Longhorn Adult Micro:  CAT 2 – Confusion Species –       PDF Icon – click for General Verification Guidelines  |   PDF Icon – click for Specific Verification Guidelines
Blue –  Generally Common / Widespread        day-flying – Day-flying
Taxonomy:   Micro   >>  Adelidae  >> Nematopogoninae
Other Name/s: Large Long-horn
ID Difficulty:  amber  – care required in the identification process, as confusion with similar species is likely – quality photographs required.
Confusion Species:  Nematopogon schwarziellus, Nematopogon metaxella
ID pointers: The largest of the Longhorn species in Britain. The size and lack of a discal spot should help with ID
Distribution:  Generally distributed throughout the county, more so in the northern half with few records from the south
Flight Period: May /  June /  –  One generation – May-June Photographed: Yes –  Photographed By: Jane Hewitt  © All Rights Reserved
*** Last updated on 6 May 2025 by RP ***
Wingspan: 17-21mm
 Food Plant: Various herbaceous plants associated with woodland habitat
Recorded dates for Common [Blue code Blue-coded] moths are not stored on the website at this current time.
IMAGES BELOW:  

Birch Vale – 2019 – Jane Hewitt©

Nematopogon swammerdamella - 1st June 2019 - Birch Vale -Jane Hewitt
Nematopogon swammerdamella – 1st June 2019 – Birch Vale -Jane Hewitt
Nematopogon swammerdamella - 1st June 2019 - Birch Vale -Jane Hewitt

Nematopogon-swammerdamella-Birch-Vale-Jane-Hewitt Nematopogon swammerdamella- 1st June 2019 -Birch Vale-Jane Hewitt

Distribution Map for Nematopogon swammerdamella

Found 61 records
    ↳ 19 from After 2025
    ↳ 11 from 2020 - 2024
    ↳ 31 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 – Nematopogon swammerdamella

⚠️ 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: Nematopogon swammerdamella
( data includes both Larvae and Adult Stages )

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


First/Last Recorded Dates: Nematopogon swammerdamella
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: Nematopogon swammerdamella
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Nematopogon swammerdamella
AGR: 0.7%   |   Total % Change: 15.8%


CUSUM Analysis: Nematopogon swammerdamella
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 12 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 2013, reaching above average levels. The lowest population point occurred near 2012, 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: Nematopogon swammerdamella
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Nematopogon swammerdamella
( 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 - Nematopogon swammerdamella – 61 records available

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

Site NameTetradDateCountStageSource
Cromford MoorSK25X06/05/20251adultvc57_irecords_extract
upper cromford gardenSK25Y07/05/20252adultvc57_irecords_extract
Froggatt, Hope ValleySK27N10/05/20251adultvc57_irecords_extract
upper cromford gardenSK25Y10/05/20251adultvc57_irecords_extract
upper cromford gardenSK25Y15/05/20251adultvc57_irecords_extract
upper cromford gardenSK25Y16/05/20251adultvc57_irecords_extract
upper cromford gardenSK25Y17/05/20251adultvc57_irecords_extract
DWT Wyver LaneSK34P20/05/20251adultvc57_irecords_extract
Buxton: Light WoodSK07M18/05/20251adultvc57_irecords_extract
Spring Wood, CalkeSK32W24/05/20251adultvc57_irecords_extract
SheffieldSK38M20/05/20251adultvc57_irecords_extract
Lightwood Reserve, BuxtonSK07M18/05/20251adultvc57_irecords_extract
Belper, DerbyshireSK34N19/05/20251adultvc57_irecords_extract
Derbyshire Wild Life Trust Long CloughSK09G03/05/20251adultvc57_irecords_extract
Derbyshire Wild Life Trust Long CloughSK09G11/05/20251adultvc57_irecords_extract
Derbyshire Wild Life Trust Long CloughSK09G17/05/20251adultvc57_irecords_extract
Simmondley Oak woodSK09B19/05/20252adultvc57_irecords_extract
Longdendale, Wildboar Clough WoodlandSK09U20/05/20252adultvc57_irecords_extract
Derbyshire Wild Life Trust Long Clough, Herod CloughSK09G24/05/20251adultvc57_irecords_extract
Cross Green, Matlock DEJW, UKSK26Q01/06/20241Adultvc57_irecords_extract
Blacka MoorSK28V05/05/20241adultvc57_irecords_extract
upper cromford gardenSK25Y25/05/20241adultvc57_irecords_extract
Baslow, Bakewell DEPQ, UKSK27R31/05/20241Adultvc57_irecords_extract
Glossop, Bray CloughSK09K01/05/20241adultvc57_irecords_extract
Longdendale, Wildboar CloughSK09U19/05/20241adultvc57_irecords_extract
Glossop, The TwitchlingsSK09K03/06/20231adultvc57_irecords_extract
Staveley DerbyshireSK47H17/05/20231adultvc57_irecords_extract
Derbyshire Wild Life Trust Long CloughSK09G03/05/20231adultvc57_irecords_extract
Derbyshire Wild Life Trust Long CloughSK09G16/05/20232adultvc57_irecords_extract
Darley BridgeSK26K24/04/20211Adultvc57_irecords_extract
Birch ValeSK08I01/06/20191adultvc57_irecords_extract
Williamthorpe, DerbyshireSK46I17/05/20161adultvc57_irecords_extract
Hartshorne Wood, Hartshorne, SwadlincoteSK32G13/05/20151Adultvc57_danes_bc_data
Robin Wood, TicknallSK32S26/05/20141Adultvc57_danes_bc_data
Via GelliaSK25T04/06/20131adultvc57_irecords_extract
Padley Gorge (Longshaw Est)SK27P03/06/201320Adultvc57_danes_bc_data
Bow Wood,Holloway,MatlockSK35D31/05/20131Adultvc57_danes_bc_data
Carr WoodSK45A22/06/20121adultvc57_irecords_extract
Duffield Rd, Allestree, DerbySK34K04/06/20121Adultvc57_danes_bc_data
Duffield Rd, Allestree, DerbySK34K06/06/20121Adultvc57_danes_bc_data
Findern Marina, Willington, DerbySK32E12/06/20121Adultvc57_danes_bc_data
Carr Wood, RipleySK45A22/06/20121Adultvc57_danes_bc_data
Carr WoodSK45A26/05/20121adultvc57_irecords_extract
Carr Wood, RipleySK45A26/05/20121Adultvc57_danes_bc_data
High Tor, MatlockSK25Z01/05/20111adultvc57_irecords_extract
Crich Chase,AmbergateSK35L01/05/20111Adultvc57_danes_bc_data
Bamford St,RipleySK34Z01/05/20111Adultvc57_danes_bc_data
Clough Wood,Darley DaleSK26K06/05/20111Adultvc57_danes_bc_data
The Hollies,Station Rd,Darley DaleSK26R08/05/20071Adultvc57_danes_bc_data
The Hollies,Station Rd,Darley DaleSK26R15/05/20071Adultvc57_danes_bc_data
Church St,Holloway,MatlockSK35I24/05/20051Adultvc57_danes_bc_data
Church St,Holloway,MatlockSK35I25/05/20051Adultvc57_danes_bc_data
Church St,Holloway,MatlockSK35I26/05/20051Adultvc57_danes_bc_data
FOREMARK RESERVOIRSK32G25/05/20041adultvc57_irecords_extract
The Hollies,Station Rd,Darley DaleSK26R10/05/20041Adultvc57_danes_bc_data
Carvers Rocks, Hartshorne, SwadlincoteSK32G25/05/20041Adultvc57_danes_bc_data
Crich Chase (Holly tree area) (site not precise)SK35L18/05/19911Adultvc57_danes_bc_data
Crich Chase, Ambergate (site not precise)SK35L04/06/19831Adultvc57_danes_bc_data
Carvers Rocks NR, Hartshorne, Swadlincote (site not precise)SK32G19/05/19811Adultvc57_danes_bc_data
Carvers Rocks NR,Hartshorne,SwadlincoteSK32G03/06/19791Adultvc57_danes_bc_data
Carvers Rocks NR,Hartshorne,SwadlincoteSK32G25/05/19791Adultvc57_danes_bc_data

Nematopogon metaxella       Incurvaria pectinea

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