The Queen of Spain fritillary (Issoria lathonia) is a butterfly of the family Nymphalidae.

This migratory species is widespread in most of Europe, in North Africa, Canary Islands, and in the eastern Palearctic realm (Central Asia, Himalayas, Baluchistan, and Western China). These butterflies live in open areas, in dry lawns, agricultural wastelands and in extensive crops at altitudes between sea level and 2700 m.

Distribution and habitat

Issoria lathonia is a medium-sized butterfly with a wingspan of 38 - 46 mm. The wings show a deep orange-violet background, with rounded black spots arranged in regular rows and suffused with greenish gray in the females. The underside of the hindwings is decorated with large pearly nacreous spots and it is crossed by a postdiscal row of black eyespots with pearly pupils. Some pearly spots also appear at the apex of the forewings.
 The caterpillar can reach a length of 35 mm. It is grayish brown, with black spots, and relatively short brown spines with white tip, and a double row of dorsal white streaks. The suspended chrysalis is dark brown, with a large white saddle-shaped stain and some smaller ones of the same color, resembling a bird's dropping.
 The imago is loosely similar to Speyeria aglaja, Fabriciana adippe and Brenthis daphne, which have the same orange color on the upperside of the wings, but show different markings and spots. Moreover, the underside of the hindwings does not have the large pearly spots characteristic of the Queen of Spain fritillary.

Description

This species is present almost throughout the year, with three or four successive generations. The eggs are laid separately on the underside of the leaves of the host plant. The larval cycle is exceptionally short. The pupation takes place among the low vegetation, between a few leaves united by silk. This species may overwinter at all larval stages.
 Adults are strong flyers and fly from March to October. The heat-dependent caterpillars feed on Viola species (wild pansy or heartsease (Viola tricolor), field pansy (Viola arvensis), Viola canina, Viola odorata, Viola calcarata, Viola lutea, Viola biflora), lucerne (Medicago sativa), borage (Borago officinalis), Anchusa, Rubus and Onobrychis species.
 In the dry regions Issoria lathonia carries out a seasonal vertical migration between hardy evergreen shrubs and small trees of plains and mountain fir pines, where it remains in summer to descend in autumn at low altitude.

Biology

Issoria lathonia, commonly known as the Queen of Spain fritillary, can be considered a garden pest because its caterpillars feed on various plants, including garden favorites like violets and pansies, potentially causing damage to the aesthetic appeal of the garden.

garden pest

Issoria lathonia can be considered a crop pest because its caterpillars feed on various plants, including crops like lettuce, spinach, and sunflowers, potentially causing damage to the yield and quality of the crops.

crop pest

Issoria lathonia can be considered a pest because its caterpillars feed on various plants, including garden favorites and crops, potentially causing damage to the aesthetic appeal of gardens and the yield and quality of crops.

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