Arcinella Snail (Actinella arcinella ssp. arcinella)  

This species is thought to have become extinct around the beginning of the 20th century or slightly earlier. [1]

*********************

References:

[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

*********************

edited: 16.06.2020