62.033 BF1435
– Tufted Oak Knot-horn – Acrobasis tumidana – (Denis & Schiffermüller, 1775)
Adult Micro:
CAT 3
– Very rare or scarce species (includes very scarce adventives/immigrants) –
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– click for Specific Verification Guidelines
– click for General Verification Guidelines |
– click for Specific Verification Guidelines
– Significant Record / Rare / Vagrant
** Photograph required / Identification write up required
**
– care required in the identification process, as confusion with similar species is likely – quality photographs required.
Confusion Species: Acrobasis repandana (Beautiful Oak Knot-horn)
ID pointers: The adult resembles A. repandana, but rather redder and with more prominent scale tufts.
Distribution:
Only one record from DaNES – Rosliston Forest Centre, Swadlincote 27/7/2007. This is a poorly known species in the British Isles, it is scarce and localised in the south and south east of England. Records elsewhere need careful consideration as the adult resembles A repandana, some may refer to migrants.
General Comment: None
*** Last updated on 2 October 2025 by RP ***
Last Recorded Year: 2007
Last Recorded By – DaNES
Last Recorded General Area – Rosliston Forest Centre, Swadlincote
Possible Future Content
Images of Interest
Image Gallery
No gallery images found for this moth.
Temporal Distribution Chart
Adults: (between 2007 - 2007)
(click legend below to show/hide datasets)
This chart summarises all available historical occurrence records collated by ISO week of the year. It reflects recorder effort and sampling distribution as well as true biological activity, and should be interpreted as an indicative pattern of seasonal occurrence rather than a statistically controlled abundance or phenology model.
Changes in First and Last Recorded Activity Dates Over Time
Activity Data Range:
2007 –
2007
Earliest Appearance:
27th July (in 2007)
Latest Appearance:
27th July (in 2007)
This chart presents a time-series summary of recorded observations. It is based on available records at the time of analysis and will evolve as further data are added. The rolling mean provides a smoothed representation of variation in recorded activity over time. Annual record totals are shown for context; years with fewer records may provide a less complete representation of activity than years with higher recording intensity. Interpretation should consider that apparent trends may reflect both biological change and variation in recording effort.
Distribution Map for Acrobasis tumidana
Found 1 records
↳ from 2026+
↳ from 2020 - 2025
↳ 1 from Before 2020
↳ from 2026+
↳ from 2020 - 2025
↳ 1 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.
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 – Acrobasis tumidana
⚠️ 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:
Acrobasis tumidana
( data includes both Larvae and Adult Stages )
Monthly Counts By Year:
Acrobasis tumidana
( data is based on 'Adult' stage records only )
First/Last Recorded Dates: Acrobasis tumidana
Adult-only & Anything [Larvae, Pupae, Adult, Mines]
Shading shows moth presence between dates
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Recordings By Year: Acrobasis tumidana
( All data includes both Larvae and Adult Stages )
Annual Growth Rate (AGR): Acrobasis tumidana
AGR: 0% | Total % Change: 0%
Acrobasis tumidana
Insufficient records/data for an AGR analysis
Years Analysed: 2000 – 2026
Hectad (10kmx10km) Coverage: Acrobasis tumidana
( data includes both Larvae and Adult Stages )
Flight Periods – Indicative –vs– Recorded Data
Acrobasis tumidana
Acrobasis tumidana
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 - Acrobasis tumidana – 1 records available
Listed by Year - descending - scroll across to see all table columns
| Site Name | Tetrad | Date | Count | Stage | Recorder | Source | RecordKey |
|---|---|---|---|---|---|---|---|
| Rosliston (National Forest Centre), Swadlincote | SK21N | 27/07/2007 | 1 | Adult | Dave Budworth;B.G. Sewell | vc57_danes_bc_data | LC000334001CP3ZL |