Female, feeding on rhododendron, Switzerland, June 2018
Switzerland, July 2013
Male, Switzerland, July 2013
Male, Switzerland, July 2013
Female, Switzerland, June 20012
Male, Switzerland, June 2011
Female, Switzerland, June 2011
Female above, male below, Switzerland, June 2007
Male, Switzerland, July 2010
Switzerland, June 2007
Male, Switzerland, June 2007
Male, Switzerland, June 2007
Male, Switzerland, June 2007
Distribution
This lovely butterfly flies
very locally
in the Alps, where it is represented by subspecies wolfenbergeri. Its
English name,
the Asian fritillary, reflects the fact it is far more widespread
further east, from the Urals, across Russia and Siberia to China and
Korea. Our populations cannot have had any contact with these Asian
populations for thousands of years. It flies in woodland clearings and
open hillsides near woods, in association with its sole foodplant, blue
honeysuckle (Lonicera
caerulea).
In Switzerland, I see it principally between about 1800m and 2000m, but
it is said to fly from 1500m to 2400m across its range. It loves to
nectar on thyme and rhododendron, both of which are plentiful at my
main site, often together with false heath and pearl-bordered
fritillaries.
Although superficially similar to other Euphydryas species,
it is unlikely
to be confused with any because of its very particular habitat and
geographical location. Marsh fritillaries do fly in the same sites, but
these almost always show strong dark post-discal spots on the hindwing
- absent in the Asian fritillary. On the underside, the Asian
fritillary has a narrow black line dividing the pale discal band of the
hindwing. It is all in all a very distinctive butterfly. Only the
scarce fritillary, Euphydryas
maturna,
is really similar, and in Europe this doesn't fly in the same places,
nor above about 1000m (according to Tolman, the two species are
sympatric in parts of East Asia).
Eggs are laid in batches on
the undersides
of blue honeysuckle leaves. The caterpillars hibernate twice, taking
two seasons to complete their development, and the butterflies fly from
the end of June until the end of July or into August.