There are about 25 species of orange-and-black fritillaries that occur in the western Alps. Most are pretty similar to each other so they represent a bit of an identification headache if you are not familiar with them.
In the early part of the trip, Glanville Fritillary was by far the commonest species of fritillary encountered. They are easily distinguished from other fritillaries with orange-and-black checkered upperwings by the the row of square-shaped spots inside the orange lunules on the hindwing.
The only species that shares this feature is the Marsh Fritillary, but confusion between these two is unlikely. Marsh tends to be a lot less uniform in its orange ground colour and often has bands of contrasting yellowish lunules and lacks the strongly checkered edging to both the fore and hind wings.
The single large white spot in the central yellow band on the underside of the hindwing identifies the individual shown below as B. euphrosyne. The very similar B. selene has several white spots in this band.
The dark hindwing dotted with small orange spots renders the False Heath Fritillary one of the most distinctive, and easiest to identify, alpine fritillaries.
Male Shepherd's and Mountain Fritillaries are very similar in their upperwing markings, with the main difference between the two being that the first row of post-discal spots are macular (comprised of separate triangular spots) in Shepherd's Fritillary but "linear" (the triangular spots touching to form a continuous line) in Mountain Fritillary.
It is not obvious from photographs, but both Titania's Fritillary and Dark Green Fritillary are noticeably larger in size than all the preceding species.
High Brown Fritillary is similar in size to Dark Green Fritilly but can be distinguished by its straight, slightly concave, edge to the outer margin of the forewing.
Weaver's Fritillary is widespread and locally common throughout most of southern and central Europe where it can be found in grassy meadows and woodland clearings up to an altitude of around 1600m.
Spotted Fritillary is common from sea-level to the high mountains, but requires sun, flowers and open dry areas to thrive.
Meadow Fritillary and Knapweed Fritillary are both common in SW Europe.
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