Madeiran Cylichnidia Snail (Cylichnidia cylichna)
The Madeiran Cylichnidia Snail was described in 1852; it is only known from subfossil material that had been recovered from Middle Pleistocene to Holocene deposits at the Ponta de São Lourenço Peninsula as well as from Caniçal, both in the easternmost part of Madeira. [1]
The species must have survived into the 1950s as the youngest known specimens that were found could be dated to that age; the species thus died out without having ever been seen alive. [2]
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syn. Achatina cylichna Lowe, Ferussacia cylichna (Lowe)
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(public domain)
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References:
[1] George W. Tryon; Henry A. Pilsbry; a.o.: Manual of Conchology. Second series: Pulmonata. Volume 19. Oleacinidae, Ferussacidae 1907-1908
[1] Glenn A. Goodfriend; R. A. D. Cameron; L. M. Cook: Fossil evidence of recent human impact on the land snail fauna of Madeira. Journal of Biogeography 21: 309-320. 1994
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edited: 15.02.2024