The cinquefoil skipper (Pyrgus cirsii) is a species of skipper butterfly (family Hesperiidae). It has a scattered distribution in central and southern Europe, and several isolated populations in north-eastern Turkey and in Armenia.
This species has a wingspan of 26–28 mm and, typically of its genus, can be very difficult to identify in the field. It is sometimes considered a subspecies of the carline skipper (P. carlinae) as the two are known to interbreed where their ranges overlap in the Alps but can usually be recognised by the prominent squarish, rather than c-shaped, white spot near the costa of the forewing and the usually deeper red-brown underwings. The cinquefoil skipper flies in July and August.
- van Swaay, C.; Wynhoff, I.; Verovnik, R.; Wiemers, M.; López Munguira, M.; Maes, D.; Sasic, M.; Verstrael, T.; Warren, M. & Settele, J. (2010). "Pyrgus cirsii". The IUCN Red List of Threatened Species. IUCN. 2010: e.T39481A10240539. doi:10.2305/IUCN.UK.2010-1.RLTS.T39481A10240539.en. Retrieved 9 November 2017.
- Butterfly Conservation Armenia http://www.butterfly-conservation-armenia.org/pyrgus-cirsii.html
- Van Swaay & Warren (2000). "Pyrgus cirsii". IUCN Red List of Threatened Species. Version 2006. International Union for Conservation of Nature. Retrieved 11 May 2006. Database entry includes justification for why this species is vulnerable.
- Whalley, Paul - Mitchell Beazley Guide to Butterflies (1981, reprinted 1992) ISBN 0-85533-348-0
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