basis of recordCameron, R. A. D.; Cook, L. M.; Goodfriend, G. A.; Seddon, M. B. (2006). Fossil land snail faunas of Porto Santo, Madeiran archipelago: change and stasis in Pleistocene to recent times. <em>Malacologia.</em> 49(1): 25-59., available online athttps://doi.org/10.4002/1543-8120-49.1.25[details]