70.297 BF1665  –  Geometridae –  Geometrinae – Pseudoterpna pruinata – Grass Emerald – (Walker, 1863) Adult Macro:  CAT 2 – Can be confused with other species – Good photographs maybe required – Can be confused with other species       PDF Icon – click for Adult Macro Verification Guidelines

Brown –  Significant Record / Very Rare / Vagrant    
Taxonomy:   Macro   >>  Geometridae  >> Geometrinae
ID Difficulty:  green  – easy to identify, generally distinctive and unlikely to be confused with other species.
ID pointers: The pale bluish tinged green forewings are characteristic. The darker post-median lines also help to identify this species
Distribution:  (Last record: 19 June 2025 at High Peak )  –  A resident that is generally uncommon and locally distributed in Derbyshire. General loss of suitable habitat seems to be the cause of losses in population of what has never been a common species in the county. The central Coal Measures of Derbyshire were once the main stronghold and relict populations may still exist.
General Comment: None
Flight Period: June /  July /  August –  June – August Moth Activity: Cathemeral   – and is attracted to light Photographed: Yes –  Photographed By: Sid Morris; PatFW (i Nature)  © All Rights Reserved
*** Last updated on 14 January 2026 by TD ***
Wingspan: 30-35mm
Forewing: 14-19mm
Food Plant: Petty whin (Genista anglica, gorse (Ulex) and broom (Cytisus scoparius).
Last Recorded Year: 2025
Last Recorded By – PatFW (iNature)
Last Recorded General Area – High Peak

Selected Images:  

Markham Vale – 15th August 2023 – Sid Morris© / High Peak 19th June 2025 PatFW



Distribution Map for Pseudoterpna pruinata

Found 19 records
    ↳ from 2026+
    ↳ 2 from 2020 - 2025
    ↳ 17 from Before 2020
Flying
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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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 – Pseudoterpna pruinata

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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.

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Monthly Records By Year: Pseudoterpna pruinata
( data includes both Larvae and Adult Stages )

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


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

Hectad (10kmx10km) Coverage: Pseudoterpna pruinata
( data includes both Larvae and Adult Stages )

Flight Periods – Indicative –vs– Recorded Data
Pseudoterpna pruinata
( 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 2020-2026.

Records Behind the Map and Charts - Pseudoterpna pruinata – 19 records available

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

Site NameTetradDateCountStageSource
Shallcross Avenue, High Peak, England, GBSK07E19/06/20251Adultvc57_irecords_extract
Markham Vale DerbyshireSK47K15/08/20231adultvc57_irecords_extract
Lang Rd, Alvaston, DerbySK33R21/07/19921Adultvc57_danes_bc_data
Whitwell Wood,WhitwellSK57E20/07/19901Adultvc57_danes_bc_data
Whitwell Wood,WhitwellSK57E20/07/19901Adultvc57_danes_bc_data
Shardlow Hall, Shardlow, Long EatonSK43F09/07/19841Adultvc57_danes_bc_data
Askew Grove, ReptonSK32D29/07/19771Adultvc57_danes_bc_data
Askew Grove, ReptonSK32D29/07/19771Adultvc57_danes_bc_data
Field Studies Building, Drakelow Nature TrailSK21J05/07/19771Adultvc57_danes_bc_data
Askew Grove, ReptonSK32D10/07/19761Adultvc57_danes_bc_data
Askew Grove, ReptonSK32D10/07/19761Adultvc57_danes_bc_data
Askew Grove, ReptonSK32D09/07/19761Adultvc57_danes_bc_data
Askew Grove, ReptonSK32D09/07/19761Adultvc57_danes_bc_data
Field Studies Building, Drakelow Nature TrailSK21J03/07/19763Adultvc57_danes_bc_data
Newbold Ave, ChesterfieldSK37R07/07/19701Adultvc57_danes_bc_data
Gleadless area (site not precise)SK38W07/07/19701Adultvc57_danes_bc_data
Welbeck Rd, BolsoverSK47V03/08/19691Adultvc57_danes_bc_data
Berry St, Hepthorne Lane, North WingfieldSK46C31/07/19671Adultvc57_danes_bc_data
Berry St, Hepthorne Lane, North WingfieldSK46C23/07/19671Adultvc57_danes_bc_data

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