Turban Snail (Biotocus turbinatus)
This species was described in 1870, it is known from the states of Alagoas and Bahia, Brazil; it is considered extinct in the IUCN Red List without further explanation.
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Despite the species being believed to be extinct, there actually exist specimens in the Muséum national d’Histoire naturelle in Paris, France that apparently were collected alive in 1998 “under humid tree trunks in Pedra Talhada“, long after the assumed extinction date.
Yet, the species was not found during the most recent searches in 2015. [1]
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References:
[1] Rodrigo B. Salvador; Laurent Charles; Luiz R. L. Simone; Philippe Maestrati: Presumed extinct land snail Megalobulimus cardosoi found again in Pedra Talhada Biological Reserve, north-east Brasil. Tentacle 26: 13-14. 2018
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edited: 30.10.2020