– click for General Verification Guidelines | – click for Specific Verification Guidelines 
– Uncertain/Unknown – Insufficient Data
– difficult to identify – detailed examination required, often a Gen Det and/or specimen and quality photographs are required.Confusion Species: Merrifieldia leucodactyla (Thyme Plume); Merrifieldia baliodactylus (Dingy White Plume)
no images were found
Distribution Map for Merrifieldia tridactyla
No records foundIf 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 – Merrifieldia tridactyla
⚠️ 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.
Monthly Records By Year:
Merrifieldia tridactyla
( data includes both Larvae and Adult Stages )
Monthly Counts By Year: Merrifieldia tridactyla
( data is based on 'Adult' stage records only. )
First/Last Recorded Dates: Merrifieldia tridactyla
Adult-only & Anything [Larvae, Pupae, Adult, Mines]
Shading shows moth presence between dates
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Recordings By Year: Merrifieldia tridactyla
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Merrifieldia tridactyla
AGR: 0% | Total % Change: 0%
Merrifieldia tridactyla
Insufficient records/data for an AGR analysis
Merrifieldia tridactyla
Insufficient records/data for a CUSUM analysis
Hectad (10kmx10km) Coverage: Merrifieldia tridactyla
( data includes both Larvae and Adult Stages )
Flight Periods – Indicative –vs– Recorded Data
Merrifieldia tridactyla
Merrifieldia tridactyla
( 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 - Merrifieldia tridactyla – 0 records available
Listed by Year - descending - scroll across to see all table columns
No records found for Merrifieldia tridactyla.