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Boloria napaea

Mountain Fritillary

Field Notes

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Valais, Switzerland, July 2007

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

Valais, Switzerland, July 2006

 

E Switzerland, July 2003

Female showing violet sheen

 

Provence, France, July 2003

Markings rather well defined

 

Provence, France, July 2003

Female

 

Provence, France, July 2003

Female with Large Ringlet, Erebia euryale.

 


This is one of two species I find very difficult to separate - the other one is the Shepherd's Fritillary, C. pales. There are another 2 very similar species (Balkan and Cranberry Fritillaries, B. graeca and B. aquilonaris) that further confuse the situation but these are both relatively uncommon where they overlap and can be readily separated. See the table for B. graeca for more information on all 4 species.

Certain females of napaea are instantly recognisable by the violet mauve sheen that covers the uppersides. Specimens without this sheen need closer inspection for proper identification. To separate napaea and pales it is first necessary to note where they were found. Their ranges only overlap in the eastern Pyrenees and the Alps.

In the Pyrenees:

Feature

napaea

pales

Underside forewing black markings shadows only clearly marked black

In the Alps:

Feature

napaea

pales

comment

Two rows of submarginal spots

roughly parallel

start converging from space 4

To me it seems the spot of the inner row in space 4 is displaced outwards making it look like the rows start converging.

Upper forewing black discal markings

fine

thick

This feature is variable and I'm not always convinced it holds true

Underside "feel"

yellow, better defined

reddish, markings blended or smudged together. 

Subjective test but may help when other features considered

 

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