Borkhausenia fuscescens       Batia lunaris
28.014 BF642  –  Oecophoridae –  Oecophorinae – Crassa unitella – Brown Bark Moth – (Hübner, 1796) Adult Micro:  CAT 2 – Confusion Species –       PDF Icon – click for General Verification Guidelines  |   PDF Icon – click for Specific Verification Guidelines
Blue –  Generally Common / Widespread   
Taxonomy:   Micro   >>  Oecophoridae  >> Oecophorinae
Other Name/s: Plain Bark Moth, Golden-brown Tubic
ID Difficulty:  amber  – care required in the identification process, as confusion with similar species is likely – quality photographs required.
Confusion Species:  C.tinctella
ID pointers: Fairly distinctive in appearance. A yellow head and golden brown body and forewings.
Distribution:  Formally Batia unitella – Status unsure, not listed in Harrison & Sterling (1988). Suspect locally common but seems to be widespread across most parts of the county.
Flight Period: June /  July /  August /  –  On the wing in June – August.  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: 13-17mm
 Food Plant: Larvae feed on fungus on and under bark.
Recorded dates for Common [Blue code Blue-coded] moths are not stored on the website at this current time.
IMAGES BELOW:  Melbourne, Derbyshire – Tony Davison ©

28.014 BF642 - Oecophoridae - Oecophorinae - Crassa unitella - Tony Davison
28.014 BF642 – Oecophoridae – Oecophorinae – Crassa unitella – Tony Davison
28.014 BF642 - Oecophoridae - Oecophorinae - Crassa unitella - Tony Davison

 
 

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Distribution Map for Crassa unitella

Found 173 records
    ↳ 37 from After 2025
    ↳ 49 from 2020 - 2024
    ↳ 87 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 – Crassa unitella

⚠️ 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: Crassa unitella
( data includes both Larvae and Adult Stages )

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


First/Last Recorded Dates: Crassa unitella
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: Crassa unitella
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Crassa unitella
AGR: 0.79%   |   Total % Change: 18.9%


CUSUM Analysis: Crassa unitella
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 4 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 2008, reaching above average levels. The lowest population point occurred near 2016, 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: Crassa unitella
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Crassa unitella
( 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 - Crassa unitella – 173 records available

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

TaxonSite NameTetradYearDateCountStageSource
Crassa unitellaStaunton Harold ReservoirSK32S202505/09/20251adultvc57_irecords_extract
Crassa unitellaBelperSK34N202506/08/20251adultvc57_irecords_extract
Crassa unitellaJim Mart Nature ReserveSK36S202512/08/20251adultvc57_irecords_extract
Crassa unitellaCromford MoorSK25X202511/08/20251adultvc57_irecords_extract
Crassa unitellaBamford, Hope Valley SBE, UKSK28B202513/08/20251Adultvc57_irecords_extract
Crassa unitellaBelper, DerbyshireSK34N202517/08/20251adultvc57_irecords_extract
Crassa unitellaIngleby Ave, DerbySK33L202507/07/20254adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202511/07/20252adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202512/07/20252adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202513/07/20252adultvc57_irecords_extract
Crassa unitellaMelbourne, DerbyshireSK32X202513/07/20252adultvc57_irecords_extract
Crassa unitellaIngleby Ave, DerbySK33L202516/07/20251adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202518/07/20251adultvc57_irecords_extract
Crassa unitellaOld Marble Mill, Ashford in the WaterSK16Z202523/07/20251adultvc57_irecords_extract
Crassa unitellaOld Marble Mill, Ashford in the WaterSK16Z202530/07/20251adultvc57_irecords_extract
Crassa unitellaChaddesden, DerbySK33T202511/07/20251adultvc57_irecords_extract
Crassa unitellaBelper, DerbyshireSK34N202505/07/20251adultvc57_irecords_extract
Crassa unitellaChaddesden, DerbySK33T202518/07/20251adultvc57_irecords_extract
Crassa unitellaBelper, DerbyshireSK34N202512/07/20251adultvc57_irecords_extract
Crassa unitellaBelper, DerbyshireSK34N202516/07/20251adultvc57_irecords_extract
Crassa unitellaBelper, DerbyshireSK34N202521/07/20251adultvc57_irecords_extract
Crassa unitellaBelper, DerbyshireSK34N202524/07/20251adultvc57_irecords_extract
Crassa unitellaBelper, DerbyshireSK34N202525/07/20251adultvc57_irecords_extract
Crassa unitellaBelper, DerbyshireSK34N202529/07/20251adultvc57_irecords_extract
Crassa unitellaIngleby Ave, DerbySK33L202516/06/20251adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202517/06/20251adultvc57_irecords_extract
Crassa unitellaHavercroft RoadSK38L202520/06/20251adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202521/06/20251adultvc57_irecords_extract
Crassa unitellaChaddesden GardenSK33T202521/06/20251adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202525/06/20251adultvc57_irecords_extract
Crassa unitellaBelperSK34N202525/06/20251adultvc57_irecords_extract
Crassa unitellaChaddesden GardenSK33T202514/06/20251adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202527/06/20251adultvc57_irecords_extract
Crassa unitellaNorton Lees, SheffieldSK38L202530/06/20251adultvc57_irecords_extract
Crassa unitellaDarwin ForestSK26X202530/06/20251adultvc57_irecords_extract
Crassa unitellaMidway, Derbys.SK32A202530/06/20251adultvc57_irecords_extract
Crassa unitellaDerby DESK33I202520/06/20251adultvc57_irecords_extract
Crassa unitellaDWT Wyver LaneSK34P202404/09/20241adultvc57_irecords_extract
Crassa unitellaKing's NewtonSK32Y202405/09/20241adultvc57_irecords_extract
Crassa unitellaLower Cromford GardenSK25Y202402/08/20241adultvc57_irecords_extract
Crassa unitellaMickleover gardenSK33C202401/08/20241adultvc57_irecords_extract
Crassa unitellaHathersageSK28F202401/08/20241adultvc57_irecords_extract
Crassa unitellaNorton Lees, Sheffield, UKSK38L202417/07/20241Adultvc57_irecords_extract
Crassa unitellaBelperSK34N202417/07/20241adultvc57_irecords_extract
Crassa unitellaForbes Hole LNRSK43W202419/07/20241adultvc57_irecords_extract
Crassa unitellaScalpcliffe roadSK22R202430/07/20241adultvc57_irecords_extract
Crassa unitellaShirland - Hallfieldgate LaneSK35Z202419/07/20241Adultvc57_irecords_extract
Crassa unitellaShirland - Hallfieldgate LaneSK35Z202430/07/20241Adultvc57_irecords_extract
Crassa unitellaWest Park Fox Covert LNRSK43W202431/07/20241adultvc57_irecords_extract
Crassa unitellaChaddesden, DerbySK33T202418/07/20241adultvc57_irecords_extract
Crassa unitellaNorton Lees, Sheffield (VC)SK38L202429/07/20243adultvc57_irecords_extract
Crassa unitellaNorton Lees, Sheffield (VC)SK38L202419/07/20243adultvc57_irecords_extract
Crassa unitellaNorton Lees, Sheffield (VC)SK38L202422/07/20241adultvc57_irecords_extract
Crassa unitellaNorton Lees, Sheffield (VC)SK38L202428/07/20241adultvc57_irecords_extract
Crassa unitellaBirch ValeSK08I202431/07/20241adultvc57_irecords_extract
Crassa unitellaKing's NewtonSK32Y202429/07/20241adultvc57_irecords_extract
Crassa unitellaAshford Marble MillSK16Z202425/07/20241adultvc57_irecords_extract
Crassa unitellaAshford Marble MillSK16Z202430/07/20241adultvc57_irecords_extract
Crassa unitellaDerby DESK33I202430/07/20241adultvc57_irecords_extract
Crassa unitellaDerby DESK33I202419/07/20241adultvc57_irecords_extract
Crassa unitellaInkersall gardenSK47C202426/06/20241adultvc57_irecords_extract
Crassa unitellaSouth WoodSK31U202427/06/20241adultvc57_irecords_extract
Crassa unitellaStaveley DerbyshireSK47H202303/09/20231adultvc57_irecords_extract
Crassa unitellaAllestree, Derby, Elm GroveSK34K202302/09/20231adultvc57_irecords_extract
Crassa unitellaHavercroft RoadSK38L202310/08/20231Adultvc57_irecords_extract
Crassa unitellaLong Eaton, Marlborough RoadSK43X202307/07/20231adultvc57_irecords_extract
Crassa unitellaWoodland AveSK43R202307/07/20234adultvc57_irecords_extract
Crassa unitellaBelper GardenSK34P202307/07/20231adultvc57_irecords_extract
Crassa unitellaBelperSK34N202317/07/20231adultvc57_irecords_extract
Crassa unitellaAllestree, Derby, Elm GroveSK34K202201/08/20222adultvc57_irecords_extract
Crassa unitellaAllestree, Derby, Elm GroveSK34K202201/08/20222adultvc57_irecords_extract
Crassa unitellaStaveley DerbyshireSK47H202212/07/20221adultvc57_irecords_extract
Crassa unitellaWoodland AveSK43R202219/07/20222Adultvc57_irecords_extract
Crassa unitellaMidway, Derbys.SK32A202110/08/20211adultvc57_irecords_extract
Crassa unitellaWoodland AveSK43R202102/07/20211adultvc57_irecords_extract
Crassa unitellaWoodland AveSK43R202118/07/20211adultvc57_irecords_extract
Crassa unitellaWoodland AveSK43R202120/07/20211adultvc57_irecords_extract
Crassa unitellaMarlborough Road, Long Eaton, DerbysSK43X202007/08/20201adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y202014/08/20201Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y202005/08/20201Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y202007/08/20203Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y202012/08/20204Adultvc57_irecords_extract
Crassa unitellaBirch ValeSK08I202011/08/20201adultvc57_irecords_extract
Crassa unitellaWoodland AveSK43R202029/07/20201adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y202012/07/20201Adultvc57_irecords_extract
Crassa unitellaWoodland AveSK43R202030/06/20201adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y201922/08/20191Adultvc57_irecords_extract
Crassa unitellaWelbeck Drive, WingerworthSK36T201926/08/20191adultDanes_2019-2021
Crassa unitellaNorton LeesSK38L201903/08/20192adultDanes_2019-2021
Crassa unitellaNorton LeesSK38L201902/08/20191adultDanes_2019-2021
Crassa unitellaMarlborough Road, Long Eaton, DerbysSK43X201916/07/20191adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y201915/07/20193Adultvc57_irecords_extract
Crassa unitellaLong Eaton - Marlborough RoadSK43X201904/07/20191Adultvc57_irecords_extract
Crassa unitellaPleasley Pit CP, PleasleySK46X201927/07/20191adultDanes_2019-2021
Crassa unitellaNorton LeesSK38L201925/07/20193adultDanes_2019-2021
Crassa unitellaLang Rd, Alvaston, DerbySK33R201924/07/20191adultDanes_2019-2021
Crassa unitellaWood Lane, Newhall, SwadlincoteSK22V201918/07/20192adultDanes_2019-2021
Crassa unitellaNorton LeesSK38L201916/07/20195adultDanes_2019-2021
Crassa unitellaNorton LeesSK38L201915/07/20193adultDanes_2019-2021
Crassa unitellaWood Lane, Newhall, SwadlincoteSK22V201912/07/20191adultDanes_2019-2021
Crassa unitellaNorton LeesSK38L201905/07/20192adultDanes_2019-2021
Crassa unitellaMain Street, Kings NewtonSK32Y201819/07/20181Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y201818/07/20181Adultvc57_irecords_extract
Crassa unitellaNorton LeesSK38L201801/07/20181Adultvc57_irecords_extract
Crassa unitellaTrowell Marsh LNRSK43U201807/07/20181adultvc57_irecords_extract
Crassa unitellaNorton LeesSK38L201806/07/20183Adultvc57_irecords_extract
Crassa unitellaNorton LeesSK38L201829/06/20181Adultvc57_irecords_extract
Crassa unitellaShirland - Hallfieldgate LaneSK35Z201706/07/20172adultvc57_irecords_extract
Crassa unitellaNorton Lees gardenSK38L201623/08/20161not recordedvc57_irecords_extract
Crassa unitellaSheffield, England, United KingdomSK38L201619/07/20161Adultvc57_irecords_extract
Crassa unitellaBackgarden MarehaySK34Z201620/07/20161adultvc57_irecords_extract
Crassa unitellaBackgarden MarehaySK34Z201623/07/20162adultvc57_irecords_extract
Crassa unitellaShirland - Hallfieldgate LaneSK35Z201622/07/20161Adultvc57_irecords_extract
Crassa unitellaNorton Lees gardenSK38L201618/07/20161not recordedvc57_irecords_extract
Crassa unitellaNorton Lees gardenSK38L201621/07/20161not recordedvc57_irecords_extract
Crassa unitellaNorton Lees gardenSK38L201623/07/20162not recordedvc57_irecords_extract
Crassa unitellaWood Lane,Newhall,SwadlincoteSK22V201621/07/20161Adultvc57_danes_bc_data
Crassa unitellaWaingroves Wood Moth and Bat EventSK44E201508/08/20151adultvc57_irecords_extract
Crassa unitellaWaingroves Wood Moth and Bat EventSK44E201508/08/20151adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y201406/08/20141Adultvc57_irecords_extract
Crassa unitellaBackgarden MarehaySK34Z201410/07/20141adultvc57_irecords_extract
Crassa unitellaWood Lane,Newhall,SwadlincoteSK22V201418/07/20141Adultvc57_danes_bc_data
Crassa unitellaBackgarden MarehaySK34Z201309/07/20131adultvc57_irecords_extract
Crassa unitellaBackgarden MarehaySK34Z201323/07/20131adultvc57_irecords_extract
Crassa unitellaBackgarden MarehaySK34Z201326/07/20132adultvc57_irecords_extract
Crassa unitellaBackgarden MarehaySK34Z201212/08/20121adultvc57_irecords_extract
Crassa unitellaBamford St,RipleySK34Z201212/08/20121Adultvc57_danes_bc_data
Crassa unitellaBackgarden MarehaySK34Z201217/07/20121adultvc57_irecords_extract
Crassa unitellaCarr WoodSK45A201222/07/20123adultvc57_irecords_extract
Crassa unitellaCarr WoodSK45A201222/07/20121adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y201225/07/20122Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y201226/07/20121Adultvc57_irecords_extract
Crassa unitellaBamford St,RipleySK34Z201217/07/20121Adultvc57_danes_bc_data
Crassa unitellaCarr Wood, RipleySK45A201222/07/20124Adultvc57_danes_bc_data
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y201225/07/20122Adultvc57_danes_bc_data
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y201226/07/20121Adultvc57_danes_bc_data
Crassa unitellaBackgarden MarehaySK34Z201101/08/20111adultvc57_irecords_extract
Crassa unitellaBamford St,RipleySK34Z201101/08/20111Adultvc57_danes_bc_data
Crassa unitellaRose Av,ClowneSK57D201011/07/20101Adultvc57_danes_bc_data
Crassa unitellaMain Street, Kings NewtonSK32Y200802/08/20082Adultvc57_irecords_extract
Crassa unitellaRobin WoodSK32M200803/08/20083Adultvc57_irecords_extract
Crassa unitellaRobin Wood (central area)SK32M200804/08/20083Adultvc57_danes_bc_data
Crassa unitellaBristol Rd,IlkestonSK44R200805/08/20081Adultvc57_danes_bc_data
Crassa unitellaCalke Park Ticknall Lime YardsSK32R200703/08/20073adultvc57_irecords_extract
Crassa unitellaBristol Rd,IlkestonSK44R200710/08/20071Adultvc57_danes_bc_data
Crassa unitellaDovedaleSK15K200710/08/20071Adultvc57_danes_bc_data
Crassa unitellaTicknall Limeyards,TicknallSK32R200703/08/20073Adultvc57_danes_bc_data
Crassa unitellaCalke Park Ticknall Lime YardsSK32R200722/07/20071adultvc57_irecords_extract
Crassa unitellaTicknall Limeyards,TicknallSK32R200722/07/20071Adultvc57_danes_bc_data
Crassa unitellaKedleston ParkSK34A200612/08/20061not recordedvc57_irecords_extract
Crassa unitellaKedleston Park (Hall garden), DerbySK34A200612/08/20061Adultvc57_danes_bc_data
Crassa unitellaDovedaleSK15L200621/07/20061Adultvc57_danes_bc_data
Crassa unitellaMain Street, Kings NewtonSK32Y200511/07/20051Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y200513/07/20051Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y200521/07/20052Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y200526/07/20051Adultvc57_irecords_extract
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y200513/07/20051Adultvc57_danes_bc_data
Crassa unitellaForemark Resr, TicknallSK32H200509/07/20051Adultvc57_danes_bc_data
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y200511/07/20051Adultvc57_danes_bc_data
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y200521/07/20052Adultvc57_danes_bc_data
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y200526/07/20051Adultvc57_danes_bc_data
Crassa unitellaMain Street, Kings NewtonSK32Y200401/08/20041Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y200404/08/20041Adultvc57_irecords_extract
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y200401/08/20041Adultvc57_danes_bc_data
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y200404/08/20041Adultvc57_danes_bc_data
Crassa unitellaSpinney Hill,MelbourneSK32X200406/08/20041Adultvc57_danes_bc_data
Crassa unitellaEdgecote Drive,Newhall,SwadlincoteSK22V200407/08/20041Adultvc57_danes_bc_data
Crassa unitellaMain Street, Kings NewtonSK32Y200413/07/20041Adultvc57_irecords_extract
Crassa unitellaMain Street, Kings NewtonSK32Y200427/07/20043Adultvc57_irecords_extract
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y200413/07/20041Adultvc57_danes_bc_data
Crassa unitellaMain St,Kings Newton,MelbourneSK32Y200427/07/20043Adultvc57_danes_bc_data
Crassa unitellaRosliston National Forest CentreSK21N200301/08/20031Adultvc57_irecords_extract
Crassa unitellaRosliston (National Forest Centre), SwadlincoteSK21N200301/08/20031Adultvc57_danes_bc_data

 
Borkhausenia fuscescens       Batia lunaris

Copyright Tony Davison © 2025 www.derbyshiremoths.org

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