Unexpected Wollastonia Snail (Wollastonia inexpectata)
This species was described in 2018 during a genus-group revision; it is known only from subfossil material which was collected from near the northern shore of Porto Santa.
The species apparently was already extinct when before the island was scientifically explored. [1]
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References:
[1] Willy De Mattia; Marco T. Neiber; Klaus Groh: Revision of the genus-group Hystricella R. T. Lowe, 1855 from Porto Santo (Madeira Archipelago), with descriptions of new recent and fossil taxa (Gastropoda, Helicoidea, Geometridae). ZooKeys 732: 1-125. 2018
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edited: 01.08.2022