Lleyn Transparent Burnet (Zygaena purpuralis ssp. segontii)
This subspecies of the Transparent Burnet inhabited the coastal cliffs of the Lleyn Peninsula in the northwest of Wales, where it was last seen in the year 1962.
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http://www.pbase.com/plusiotis
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References:
[1] Clive Hambler; Martin R. Speight: Extinction Rates in British Nonmarine Invertebrates Since 1900. Conservation Biology 10(3): 892-896. 1996
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edited: 22.03.2018