Lulworth skipper their greatest since its discovery there. With a wingspan of 24 to 28 millimetres, females being larger than males, the Lulworth skipper is a small butterfly, the smallest member of the genus "Thymelicus" in Europe and among the smallest butterflies in Britain. Aside from the size difference, the sexes are distinguished by females having a distinct circle of golden marks on each forewing. Due to their likeness to the rays around the eye of a peacock's feather, these are often known as "sun-ray" markings, and they can faintly appear on males. The Lulworth skipper was first described by German entomologist
Lulworth skipper the "Thymelicus" genus. Of Britain's five "golden" skippers—the others being the silver-spotted skipper ("Hesperia comma"), large skipper ("Ochlodes sylvanus"), small skipper ("Thymelicus sylvestris") and Essex skipper ("Thymelicus lineola")—the Lulworth is both the smallest and darkest. Beyond its small size, it is distinguished particularly by its dark, dun-coloured wings that appear with tinges of olive-brown; this darkening especially apparent in males. Variations are known to occur; in north-west Africa, the uppersides of the forewing and hindwing are darker, with hints of greenish or greyish brown. Similarly-coloured races occur in Spain, Elba, Crete, and other eastern Mediterranean islands. "T. acteon christi", endemic