This is a Lang’s Short-tailed Blue, Leptotes pirithous, sometimes also known as the Common Zebra Blue, a very small butterfly. The uppersides of the wings are a purpley blue colour in males, bluish-brown in females. The undersides are dark beige striped with white lines. There were several of these down by Calahonda beach in Nerja. A blue zebra??
Species: L. pirithous