Chestnut-colored Helmet Snail (Leiostyla castanea)
The Chestnut-colored Helmet Snail was described in the year 1852, it appears to be or have been endemic to the island of Tenerife, Canary Islands.
The species was known to occur in damp places near Garachico, a town on the northern coast of Tenerife.
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See Thomas Vernon Wollaston in the year 1878 (Testacea Atlantica).:
“Mr. Lowe’s examples of this very distinct Pupa were taken, during April of 1861, above Garachico, in the north of Teneriffe, – namely adhering to wet rocks and sodden leaves, in the drip of a small waterfall ….” [1]
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The Chestnut-colored Helmet Snail was never recorded again since 1878 and appears to be 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: 17.01.2011