At least three independent records from different recorders/locations/dates.
Breeds and has its complete lifecycle throughout the year on Corfu. Population is self-sustaining.
Regular immigrant and/or emigrant from Corfu. May also breed but is usually not present all the year around.
Found outside its normal range, such as outside its known habitat. Not enough records to confirm as a Resident or a Migrant.
A species that is expanding its range, but is not self-sustaining, and is reliant on migrants to sustain its population. This is the stage before a species becomes a resident, or a species which is right on the edge of its known distribution.
Records that have not been substantiated and therefore the existence of such a species on Corfu is uncertain.
EU Red Data Status Definitions
Not Evaluated (NE)
A taxon is Not Evaluated when it has not yet been evaluated against the criteria
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. 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.
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.
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.
A taxon is Vulnerable when the best available evidence indicates that it meets any of the criteria A to E for Vulnerable (see Section V), and it is therefore considered to be facing a high risk of extinction in the wild.
A taxon is Endangered when the best available evidence indicates that it meets any of the criteria A to E for Endangered (see Section V), and it is therefore considered to be facing a very high risk of extinction in the wild.
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 Section V), and it is therefore considered to be facing an extremely high risk of extinction in the wild.
Extinct in the Wild (EW)
A taxon is Extinct in the Wild when it is known only to survive in cultivation, in captivity or as a naturalized population (or populations) well outside the past range. A taxon is presumed Extinct in the Wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon’s life cycle and life form.
A taxon is Extinct when there is no reasonable doubt that the last individual has died. A taxon is presumed Extinct when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual), throughout its historic range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon’s life cycle and life form.
A tiny butterfly, which is almost black in flight. The upperside is dark brown, and the underside is pale grey, with a number of black spots. The only other species it could potentially be confused with, which has a similar underside is Celastrina argiolus, which is larger with a blue upperside.
Generalised wing venation diagram
A generalised diagram of butterfly wing venation, with anatomical labels - by Gillian Elsom.
Lycaenidae wing venation diagram
The wing venation of a male Small Blue butterfly Cupido minimus an example of a butterfly from the family Lycaenidae - by Gillian Elsom.
In the UK whilst females can frequently be observed ovipositing on the early successional habitats where their host plant is to be found (e.g. areas with exposed chalk/limestone), males can be found enmass in rank grassland, where they lek in an attempt to attract mates.
Our limited observations in Corfu, confirm the habitat preferences of the former but not of the latter.
The first two sightings of this butterfly that were recorded by the members of CBC were four years apart The first was made by John Denne in his garden in Arillas at 13:55hrs on 22 April 2015. The second observation was made at approximately 750m above sea level near Mt Pantokrator by Mark Colvin and Harry E Clarke on 24 April 2019. Sine then the number of sightings have increased, with most coming from Mt. Pantokrator
In the UK this species abundance is directly proportional to the relative abundance of its host plant Kidney Vetch Anthyllis vulneraria and in some sites, where host plant abundance is high populations of over a thousand individuals have been observed.
The limited abundance of this host plant on Corfu may go, in some part, to explain the limited number of records CBC has recieved for this species. The larvae feed on the seeds of the host plant and are cannibalistic.
*The information provided in the tables below is based on verified sightings of the Small Blue submitted via this website since 1st January 2021.