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 small blue butterfly, that is often seen flying high rather than at ground level. The underside is quite distinctive, being pale grey-blue, with small black spots. The only other butterfly with which it could be confused with is Cupido minimus, which is smaller with a almost black upperside. The male has a blue upperside, whereas the female has an obvious black margin to the forewing.
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.
Found in a wide range of habitats boardered by trees and low growing shrubs, e.g. gardens, grasslands, woodland edges, maquis and garrigue.
Ivy Hedera helix, Holly Ilex aquifolium - doubtfully present, Alder Buckthorn Frangula alnus - not on Corfu, Buckthorn Rhamnus cathartica - not on Corfu, Dogwood Cornus sanguinea, Strawberry Tree Arbutus unedo, Tree Heather Erica arborea (shrub, white flowers), Wild Liquorice Astragalus glycyphyllos, Bladder-senna Colutea arborescens, Goat's-rue Galega officinalis, Lucerne Medicago sativa, Yellow Sweet Clover Melilotus officinalis, False-acacia Robinia pseudoacacia, Spanish Broom Spartium junceum, Wild Privet Ligustrum vulgare, Purple-loosestrife Lythrum salicaria, Hop Humulus lupulus, Firethorn Pyracantha coccinea.
This species is the only truly arboeal blue butterfly on the island and because its most frequently seen flying in the canopies of low growing trees and bushes it is quite easy to identify.
In the UK the Holly Blue has a well known dependencey on two common host plants: Holly Ilex aquifolium and Ivy Hedra helix. In Corfu the host plant relationships may be different because we do not have evidence for the existence of I. aquifolium on the island. Instead the first oviposition choice on Corfu is usually the buds of Bramble, Rubus possibly fruticosus. This suggests that in Corfu Rubus may have taken on the same functional role in the life cycle of this butterfly as I. aquifolium has in the UK.
More information about the host plant choices of the Holly Blue in Corfu could be enlightening.
*The information provided in the tables below is based on verified sightings of the Holly Blue submitted via this website since 1st January 2021.