Red List

• REGIONALLY EXTINCT (RE) A taxon is Extinct when there is no reasonable doubt that the last individual has died. In this review, species not recorded in GB this century are considered Regionally Extinct.
• CRITICALLY ENDANGERED (CR) A taxon is Critically Endangered when the best available evidence indicates that it meets any of the criteria A to E for Critically Endangered (see Appendix 2 of S19-17). 'Possibly Extinct' is an additional tag used for Critically Endangered taxa that are, on the balance of evidence, likely to be extinct, but for which there is a small chance that they may be extant.
• ENDANGERED (EN) A taxon is Endangered when the best available evidence indicates that it meets any of the criteria A to E for Endangered (see Appendix 2 of S19-17).
• VULNERABLE (VU) A taxon is Vulnerable when the best available evidence indicates that it meets any of the criteria A to E for Vulnerable (see Appendix 2 of S19-17).
• NEAR THREATENED (NT) A taxon is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now, but is close to qualifying for or is likely to qualify for a threatened category in the near future.
• LEAST CONCERN (LC) A taxon is Least Concern when it has been evaluated against the criteria and does not qualify for Critically Endangered, Endangered, Vulnerable or Near Threatened. Widespread and abundant taxa are included in this category.
• DATA DEFICIENT (DD) A taxon is Data Deficient when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. A taxon in this category may be well studied, and its biology well known, but appropriate data on abundance and/or distribution are lacking. Data Deficient is therefore not a category of threat. Listing of taxa in this category indicates that more information is required and acknowledges the possibility that future research will show that threatened classification is appropriate.
• NOT APPLICABLE (NA) A taxon that is deemed to be ineligible for assessment at a regional level is listed as Not Applicable. This can be for a variety of reasons e.g. because it is not within its natural range in the region or because it is a vagrant to the region. In this review, GB species that are resident because of human introduction are considered Not Applicable.
• NOT EVALUATED (NE) A taxon is Not Evaluated when it is has not yet been evaluated against the criteria.

• NATIONALLY RARE : Native species recorded (as resident breeding species) from 15 or fewer hectads (10 km x 10 km grid squares) of the GB Ordnance Survey national grid in the period 2000-2014 and where there is reasonable confidence that exhaustive recording would not find them in more than 15 hectads. This category includes species that are probably extinct.
• NATIONALLY SCARCE : Native species that are not regarded as Nationally Rare and which have not been recorded (as resident breeding species) from more than 100 hectads of the GB Ordnance Survey national grid in the period 2000-2014 and where there is reasonable confidence that exhaustive recording would not find them in more than 100 hectads.

• COMMON : Native species recorded (as resident breeding species) from more than 100 hectads (10 km x 10 km grid squares) of the GB Ordnance Survey national grid in the period 2000-2014 so do not qualify as Nationally Scarce or Nationally Rare under GB Rarity Status (Fox et al (2019) S19-17). This includes macro-moth species listed as "Local" in the Former JNCC Status.

• IMMIGRANT : Species that are known to migrate to the British Isles, but which do not normally survive the winter.

• NATURALISED : Species that have been artificially introduced and now breed successfully in the wild.

• ADVENTIVE : Species only found in Britain as a result of deliberate or accidental importation by humans.

• PRIORITY (P) BAP / UK Biodiversity Framework Biodiversity Action Plan [BAP] Priority Species.

• DECLINING (R) BAP / UK Biodiversity Framework - Biodiversity Action Plan [BAP] Declining Species. (Research Only)

• Red Data Book (RDB) 1 : species appear in the Red Data Book and are categorised as endangered.
• RDB 2 : species appear in the Red Data Book and are categorised as vulnerable.
• RDB 3 : species appear in the Red Data Book and are categorised as rare.
• RDB K : species appear in the Red Data Book but the status is unknown, although they are thought to be rare.
• pRDB 1 : species are likely to appear in the Red Data Book and be categorised as endangered.
• pRDB 2 : species are likely to appear in the Red Data Book and be categorised as vulnerable.
• pRDB 3 : species are likely to appear in the Red Data Book and be categorised as rare.
• pRDB K : suspected, but not definitely known, to be in one of the above categories but not enough information available to say which.
• Nationally Scarce A : species are nationally scarce and have been recorded in 16-30 ten kilometre squares in Great Britain.
• Nationally Scarce B : species are nationally scarce and have been recorded in 31-100 ten kilometre squares in Great Britain.
• Local : occurs in 101-300 10km squares.
• Common : occurs in more than 300 10km squares.
• Adventive : only found in Britain as a result of deliberate or accidental importation by humans.
• Migrant or Immigrant : occurs naturally in Britain but only as a result of immigration.

Nat Status (Micro-moths)

Davis, A.M. (2012). A Review of the Status of Microlepidoptera in Britain. Butterfly Conservation, Wareham. (Butterfly Conservation Report No. S12-02)