16.015 BF437  –  Yponomeutidae –  Yponomeutinae – Swammerdamia caesiella – Birch Drab – (Hübner, 1796) Adult Micro:  CAT 2 – Confusion Species –       PDF Icon – click for General Verification Guidelines  |   PDF Icon – click for Specific Verification Guidelines
Black – Uncertain/Unknown – Insufficient Data   
Taxonomy:   Micro   >>  Yponomeutidae  >> Yponomeutinae
ID Difficulty:  amber  – care required in the identification process, as confusion with similar species is likely – quality photographs required.
Confusion Species:  Paraswammerdamia nebulella. Poorly marked / worn examples required Gen Det. Grade 4
ID pointers: A tiny nondescript micro.Head whitish or brownish. Forewing a dull grey with a pallid darker brownish cross-band about half way and a dark spot on the costa near to the apex. 
Distribution:  (Last record: 8 July 2021 at Drakelow WR )  –  Uncertain/unknown due to lack of data – In Britain it is common and widespread in woodland and on heathland.
Flight Period: May /  June /  July /  August /  September /  –  Two generations May – June & July – September Moth Activity: Cathemeral   – and is attracted to light Photographed: Yes –  Photographed By: Tony Davison  © All Rights Reserved
*** Last updated on 6 May 2025 by RP ***
Wingspan: 9-13mm
Food Plant: Birch
Last Recorded Year: 2021
Last Recorded By – iRecord data
Last Recorded General Area – Drakelow WR

IMAGES BELOW:  Melbourne, Derbyshire – Tony Davison ©

 
 

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Distribution Map for Swammerdamia caesiella

Found 13 records
    ↳ 0 from After 2025
    ↳ 4 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 – Swammerdamia caesiella

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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: Swammerdamia caesiella
( data includes both Larvae and Adult Stages )

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


First/Last Recorded Dates: Swammerdamia caesiella
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: Swammerdamia caesiella
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Swammerdamia caesiella
AGR: 0%   |   Total % Change: 0%


CUSUM Analysis: Swammerdamia caesiella
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 21 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 2010, reaching above average levels. The lowest population point occurred near 2010, 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: Swammerdamia caesiella
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Swammerdamia caesiella
( 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 - Swammerdamia caesiella – 13 records available

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

TaxonSite NameTetradYearDateCountStageSource
Swammerdamia caesiellaNot givenSK22F202108/07/20211Adultvc57_irecords_extract
Swammerdamia caesiellaBuxton SK, UKSK07S202117/07/20211Adultvc57_irecords_extract
Swammerdamia caesiellaDrakelow, Derbys.SK22F202108/07/20211adultvc57_irecords_extract
Swammerdamia caesiellaMelbourne, DerbyshireSK32X202007/08/20201adultvc57_irecords_extract
Swammerdamia caesiellaBuxton SK, UKSK07S201317/07/20131Adultvc57_irecords_extract
Swammerdamia caesiellaLadycroft AveSK07S201316/07/20131adultvc57_irecords_extract
Swammerdamia caesiellaFindern Close, BelperSK34P201223/07/20121Adultvc57_danes_bc_data
Swammerdamia caesiellaFindern Close, BelperSK34P201224/07/20121Adultvc57_danes_bc_data
Swammerdamia caesiellaThorpe, DovedaleSK15K201013/10/20101Larval Feeding Signsvc57_danes_bc_data
Swammerdamia caesiellaLadybower ResrSK18U201003/09/20101Larval Feeding Signsvc57_danes_bc_data
Swammerdamia caesiellaRose Av,ClowneSK57D201010/08/20101Adultvc57_danes_bc_data
Swammerdamia caesiellaSlippery Stones,Upper DerwentSK19S201025/08/20101Larvaevc57_danes_bc_data
Swammerdamia caesiellaNorburySK14G200901/10/20091Larvaevc57_danes_bc_data

 
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