Recently I saw the Extinct Roach (Simandoa conserfariam) for the first time (and even held one), so that's an EW species I've seen now, too.
however, contrary to the species' wikipedia article, this taxon has yet to be assessed by the IUCN red list, so is not 'formally' Extinct in the Wild the way the other species mentioned here are.
Wonder how long it will be before scimitar-horned oryx and Pere David's deer are reassessed, given both species have undergone reintroduction programmes that, certainly in the case of the deer, have been long-running and pretty well established by now. Anyone know more details of if the reintroduced Chinese populations are truly 'wild'?
I'd imagine the free-roaming scimitar-horned oryx population is a way off being self-sustaining yet.
I've seen both of the above, socorro dove, golden skiffia, and several of the EW species of
Partula and
Brugmansia. I also saw pinstripe damba while it was thought to be extinct in the wild and 2 undescribed cichlids from Lake Chilingali which *may* be extinct in the wild but, like
Simandoa, have yet to be assessed. I'm also currently growing the Hawaiian lobelioid
Brighamia insignis which is listed as Critically Endangered (possibly Extinct in the Wild), but the general consensus is that it is in fact gone from the wild.