Beckmann’s Wollastonia Snail (Wollastonia beckmanni)
This species was described in 2018, it is known only from the southeastern coast of Porto Santo.
The shells reach a size of about 0,5 to 0,56 cm in diameter.
The species appears to have already been extinct before the scientific exploration of the island in the 19th century. [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: 26.04.2021