Guanarteme Land Snail (Hemicycla guanartemes)
This species was described in 1857, it is/was endemic to the island of Gran Canaria, Canary Islands.
The shell reaches/reached a size of about 2 cm in diameter.
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The Guanarteme Land Snail appears to have been quite common formerly.:
“The present Helix was taken in Gran Canary both by Grasset and Fritsch, and subsequently in considerable abundance by Mr. Lowe and myself. We found it principally in and around the little town of Teror (on one occasion even within the house of Don Pedro Manrique), but likewise in the region of El Monte, – particularly in the hollows of old trees at the Laurealos, ….” [1]
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The species is listed (as Hemicycla guamartemes) in the Red List of the IUCN as ‘data deficient’, but, since it apparently was not found during recent searches, may be already extinct.
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References:
[1] T. Vernon Wollaston: Testacea Atlantica: or the Land and Freshwater Shells of the Azores, Madeiras, Salvages, Canaries, Cape Verdes, and Saint Helena. London: L. Reeve & Co. 1878
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(public domain)
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edited: 05.12.2018