Medium size butterfly with a wingspan reaching 35–50 millimetres. The upperside of the wings is bright orange-brown with dark brown drawings arranged in rows, quite variable in quantity and size. Upperside black markings are less dense than the similar species the lesser spotted fritillary M. trivia. Sometimes the colour of the females is duller orange, shaded with gray-green. The underside of the wings is checkered pale yellow and pale orange. The underside hindwing marginal spots are approximately triangular rather than rounded. M. didyma has a seasonal and sexual dimorphism. This butterfly flies from March to October depending on the location. This species has two or three generations and overwinters as young caterpillar.
Dispersed pine tree forest. Parque Nacional de Sierra de Guadarrama
Camera Model: NIKON D300. Exposure Time: 1/640 sec., f/13, ISO Speed Rating: 400. Exposure Bias: 0 EV. Focal Length: 300.0 mm. No Flash fired
Lat: 40.74, Long: -4.09
Spotted on Jun 29, 2016
Submitted on Dec 16, 2016