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70.015 BF1712  –  Geometridae –  Sterrhinae – Idaea emarginata – Small Scallop – (Linnaeus, 1758) Adult Macro:  CAT 1 – Distinctive species unlikely to be confused with others –       PDF Icon – click for Adult Macro Verification Guidelines
Green –  Rare / Uncommon / Scarce   
Taxonomy:   Macro   >>  Geometridae  >> Sterrhinae
** Photograph required **
ID Difficulty:  green  – easy to identify, generally distinctive and unlikely to be confused with other species.
ID pointers: Fairly distinctive looking moth. Scalloped trailing edges to the wings and overall golden brown ground colour, with two dark-brown wavy cross-lines running through both wings.
Distribution:  (Last record: 22 July 2019 at Long Eaton )  –  A resident in Derbyshire, that is scarce and very locally distributed through the Trent Valley area. Very few records.
Flight Period: July /  August /  –  On the wing – July – August. Moth Activity: Nocturnal   – but can be disturbed during the day Photographed: No –  Photographed By: Not Recorded
*** Last updated on 24 June 2025 by TD ***
Wingspan: 22-25mm
Forewing: 11-13mm Food Plant: Bedstraws and Field Bindweed.
Last Recorded Year: 2019
Last Recorded By – Marion Bryce
Last Recorded General Area – Long Eaton
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Distribution Map for Idaea emarginata

Found 31 records
    ↳ 0 from After 2025
    ↳ 0 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 – Idaea emarginata

⚠️ 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: Idaea emarginata
( data includes both Larvae and Adult Stages )
No data returned from the database.

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


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


CUSUM Analysis: Idaea emarginata
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 22 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 2002, reaching above average levels. The lowest population point occurred near 2002, 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: Idaea emarginata
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Idaea emarginata
( 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 - Idaea emarginata – 31 records available

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

TaxonSite NameTetradYearDateCountStageSource
Idaea emarginataForbes HoleSK43W201922/07/20191adultvc57_irecords_extract
Idaea emarginataWilmot St,Long EatonSK43R201010/07/20101Adultvc57_danes_bc_data
Idaea emarginataArmitage Drive, Long EatonSK53B200325/07/20031Adultvc57_danes_bc_data
Idaea emarginataArmitage Drive, Long EatonSK53B200210/07/20021Adultvc57_danes_bc_data
Idaea emarginataSpringfield Ave, SandiacreSK43S199216/07/19921Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198401/08/19842Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198401/08/19842Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198421/07/19841Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198430/07/19841Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198421/07/19841Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198430/07/19841Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198318/07/19831Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198326/07/19831Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198318/07/19831Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198326/07/19831Adultvc57_danes_bc_data
Idaea emarginataAskew Grove, ReptonSK32D198213/07/19821Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198214/07/19821Adultvc57_danes_bc_data
Idaea emarginataHilton NR, Hilton, Burton on TrentSK23K198209/07/19823Adultvc57_danes_bc_data
Idaea emarginataWilmot St, Sawley, Long EatonSK43R198216/07/19822Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198214/07/19821Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198104/08/19811Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198112/08/19811Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198104/08/19811Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F198112/08/19811Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F197310/07/19732Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F197311/07/19731Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F197312/07/19732Adultvc57_danes_bc_data
Idaea emarginataShardlow Hall, Shardlow, Long EatonSK43F196711/07/19671Adultvc57_danes_bc_data
Idaea emarginataBarrow on Trent, Derby (site not precise)SK32P188501/01/18851Adultvc57_danes_bc_data
Idaea emarginataBarrow on Trent, Derby (site not precise)SK32P188501/01/18851Adultvc57_danes_bc_data
Idaea emarginataRepton (site not precise)SK32B180001/01/18001Adultvc57_danes_bc_data

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