This page can help you identify the butterfly you have seen if it belongs to the Lycaenidae or Riodinidae family :  
1) look at the butterfly thumbnails below and determine the genus or species which most closely matches your butterfly  
2) then find the genus or the species in the alphabetic index and check the species-pages by clicking on the latin names  
Please note that in some genera (Lysandra sp., Polyommatus sp., Plebejus sp. Cupido sp., Glaucopsyche sp., Cyaniris sp....), males are blue on the upperside whereas females are brown (with variable orange spots and blueish suffusion). See Lysandra bellargus page as an example.  
Agr --> Lys Mac --> Vac Illustration of the main genera and species
Agriades optilete
Agriades orbitulus
Agriades pyrenaicus
Agrodiaetus sp. [see Polyommatus sp.]
Albulina orbitulus [see Agriades orbitulus]
Aricia nicias
Maculinea sp. [see Phengaris sp.]
Meleageria daphnis [see Polyommatus daphnis]
Neozephyrus quercus [see Quercusia quercus]
Agriades sp.
Aricia sp.
Lysandra sp.
Polyommatus sp.
Plebejus sp.
Callophrys sp. 
Celastrina argiolus
Cupido sp.
Glaucopsyche sp.
Hamearis lucina

Lycaena sp.
Phengaris sp.
Cacyreus marshalli
Satyrium sp.
TABLE OF CONTENT (of species pages)
 photo available        species not pictured yet
fam. LYCAENIDAE & RIODINIDAE male female pair larva egg chrysalis last update
Agriades glandon         30/01/2022
Agriades optilete           27/12/2021
Agriades orbitulus       10/02/2022
Agriades pyrenaicus         07/02/2021
Aricia agestis 28/01/2022
Aricia artaxerxes         25/01/2022
Aricia montensis         28/01/2022
Aricia morronensis         13/05/2023
Aricia nicias       11/03/2023
Cacyreus marshalli 07/02/2021
Callophrys avis         04/04/2014
Callophrys rubi   06/04/2022
Celastrina argiolus   19/04/2019
Cupido alcetas       02/04/2022
Cupido argiades     26/03/2022
Cupido minimus     14/04/2022
Cupido osiris   02/04/2022
Cyaniris semiargus     08/06/2021
Eumedonia eumedon       08/06/2019
Glaucopsyche alexis     09/02/2022
Glaucopsyche iolas   02/12/2013
Glaucopsyche melanops     07/02/2021
Hamearis lucina       02/02/2021
Kretania trappi         12/10/2013
Laeosopis roboris       20/04/2019
Lampides boeticus   13/02/2022
Leptotes pirithous 08/05/2020
Lycaena alciphron     14/04/2022
Lycaena dispar       17/03/2013
Lycaena helle         17/03/2013
Lycaena hippothoe       18/04/2022
Lycaena phlaeas 12/02/2021
Lycaena tityrus   18/05/2019
Lycaena virgaureae       13/02/2021
Lysandra bellargus   18/04/2022
Lysandra coridon       31/05/2021
Lysandra hispana       12/05/2018
Phengaris alcon       12/10/2013
Phengaris arion     28/01/2022
Phengaris nausithous       07/02/2024
Phengaris rebeli       07/02/2024
Phengaris teleius         18/01/2022
Plebejus argus       09/02/2022
Plebejus argyrognomon       29/01/2022
Plebejus bellieri       26/04/2020
Plebejus idas     12/02/2022
Polyommatus amandus     10/05/2019
Polyommatus daphnis       18/04/2022
Polyommatus damon     13/05/2018
Polyommatus dolus         16/01/2022
Polyommatus dorylas     11/03/2023
Polyommatus eros       13/05/2023
Polyommatus escheri   19/03/2022
Polyommatus icarus 18/04/2022
Polyommatus nivescens            
Polyommatus ripartii       16/01/2022
Polyommatus thersites     18/04/2022
Pseudophilotes baton   07/04/2021
Quercusia quercus         12/10/2013
Satyrium acaciae     02/04/2022
Satyrium esculi         15/05/2021
Satyrium ilicis         02/04/2022
Satyrium pruni           17/03/2013
Satyrium spini       15/05/2021
Satyrium w-album       02/04/2022
Scolitantides orion   05/05/2019
Thecla betulae   19/12/2021
Tomares ballus     16/05/2021