Trachycystis rariplicata

[surroundx]

Cowie, Robert H., Régnier, Claire, Fontaine, Benoît, and Bouchet, Philippe. (2017). Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41.

[koeiyabe]

I also dont know of any snail species affected. It is theorized that the extinct Trachycystis rariplicata Greenpoint Snail - known only from Green Point might have been caused by this species (Connolly 1939) - but given the swamp drainage, sports-fields, houses and other extensive transformations in this area this is highly speculative: anything could have caused its extinction.
((It is now by far the commonest shell in the Cape Peninsula, where I believe it has caused the extinction of at least one native form,
Trachycysti* rariplicata Bs., for which I have often searched at Green Point, its sole locality, without unearthing anything more interesting than thousands of the European species. )) source: (Connolly 1939) biostor.org/reference/98123.text

www.ispotnature.org/communities/southern-africa/view/observation/395654/pinwheels-aestivating-mcgregor-wcape