Borsonia cliffdenensis is an extinct species of sea snail, a marine gastropod mollusk in the family Borsoniidae.Marshall, B. (2016). Borsonia clifdenensis Finlay, 1930 †. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=831614 on 2016-04-12
Distribution This extinct marine species was endemic to New Zealand.
References
Finlay, H. J. (1930). New shells from New Zealand Tertiary beds. Part 3. Transactions and Proceedings of the New Zealand Institute. 61, 49–84, 6 pls Powell, Arthur William Baden. The New Zealand Recent and Fossil Mollusca of the Family Turridae: With General Notes on Turrid Nomenclature and Systematics. No. 2. Unity Press limited, printers, 1942. Maxwell, P.A. (2009). Cenozoic Mollusca. pp 232–254 in Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.