I’ve been studying mollusks for years now and only just came across this statistic. I think these extinctions are mostly land snails (particularly Pacific islands after rosy wolf snail introductions) and freshwater mussels (particularly in the Southeastern US from habitat degradation). Both these groups are pretty well known among malacologists and have robust conservation programs (at least for invertebrates) but I don’t know how much the average person knows about them.
On another note, I would also like to see success stories of recoveries from near extinction. It can be easy to get lost in the doom and gloom, but I think there is also a lot to be hopeful for (dire wolf does not count…).