Map showing spatial distribution of I. elegans and I. graellsii in Europe and northern Africa. I. elegans (grey region) and I. graellsii (dark grey) in Europe and northern Africa, and the overlapping distribution of the two species in Spain (grey with stars). We sampled nine populations (166 samples) dominated by individuals that we phenotypically classified as I. elegans in three areas in Spain; north-west (1. Laxe, 2. Louro, 3. Doniños), north and central (4. Arreo, 5. Alfaro, 6. Baldajo) and east (Mediterranean coast: 7. Europa, 8. Amposta, 9. Marjal del Moro). Thirteen populations of allopatric I. elegans were sampled from Europe (10. Vigueirat, 11. Heuringhem, 12. Het Vinne, 13. Kaiserslautern, 14. Liverpool, 15. Värpinge, 16. Genarp, 17. Gran Sasso d'Italia, 18. Lublin-Zemborzyce, 19. Zwięczyca Reszów, 20. Breznica, 21. Suchoi Limon, 22. Enmakov Island; 220 samples). Finally, three populations of I. graellsii from the allopatric region in Iberia (23. Campus, 24. Ribeira de Cobres, 25. Córdoba) and one in northern Africa (26. Saïdia) (56 samples) were sampled.
Sánchez-Guillén et al. BMC Evolutionary Biology 2011 11:210 doi:10.1186/1471-2148-11-210