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Marsh Fritillary Butterfly - Euphydryas aurinia

Phylum: Arthropoda - Class: Insecta - Order: Lepidoptera - Family: Nymphalidae

Euphydryas aurinia, Marsh Fritillary, North Wales

The Marsh Fritillary, once widespread and abundant, is now a rare butterfly. Adults have a very variable chequered yellow, orange and brown patterning on the dorsal (upperwing) sides. The ventral sides of the wings (underwings) are patterened with yellow, orange and brown but without any silver areas.

Marsh Fritillary underwing view

Many people consider this to be the most attractive of the many fritillaries, particularly when freshly emerged; unfortunately the bright wing colours soon fade and lose some of their initial gloss.

Satyrium esculi - False Ilex Hairstreak butterfly

The Marsh Fritillary shown above is E. aurinia ssp beckeri and it was photographed at Foia, near Monchique, in the Algarve region of Portugal.

Distribution

In Britain there are still Marsh Fritillaries in many places other than the east of England and the far north and the east of Scotland. Wales has many excellent Marsh Fritillary sites, but maintaining them in the face of increased pressure for agricultural output is a continuous challenge for the conservation agency (Natural Resources Wales) and for Wildlife Trusts and other conservation bodies trying to ensure that this iconic butterfly species is not lost. Populations continue to decline due to the destruction of habitats containing its essential foodplant.

Marsh Fritillaries will move in to new areas only over short distances, so that habitat connectivity is crucially important if colonies are to move when their current sites are damaged.

On mainland Europe the Marsh Fritillary occurs in most countries other than northern Scandinavia and southern Italy. Its range extends down into northern Africa and eastwards into Asia.

Euphydryas aurinia, Marsh Fritillary, Portugal

Lifecycle

In Britain and Ireland the main larval foodplant of the Marsh Fritillary is Devil's-bit Scabious, Succisa pratensis, with various plantains (Plantago spp) also used occasionally. On mainland Europe a wider range of foodplants is used including the various knapweeds (Knautia spp).

Marsh Fritillary eggs, which are yellow, subspherical and typically 0.8 mm across, are laid in large patches during May and early June on the leaves of the foodplant. When the larvae hatch they spin protective silken webs in which they rest when not feeding. Counting the number of these communal webs on a site is an aid to monitoring population trends.

In late august or early September the caterpillars, still quite small, go into hibernation until March the following year, when they continue feeding, moving to new Scabious plants are spinning new webs for protection at night and during bad weather. When fully grown, the spiky black caterpillars pupate attached to grass stems, and the adult butterflies emerge in May and early June.

Marsh Fritillary, southern Portugal

Acknowledgements

This page includes pictures kindly contributed by Steve Jelf and Rob Petley-Jones.

Studying butterflies and moths...


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