What is the most endagred and extinct animal?

Animals at the brink of distinction are described as 'Exctinct in the Wild'. In other Words these animals only have populations in captivity. Below is a small list of what i could find as listed on wikipedia.

* Abingdon Island Tortoise * Red-tailed Black Shark * Père David's Deer * Barbary Lion (extinct in the wild since 1922) * Wyoming Toad (extinct in the wild since 1991) * Hawaiian Crow (extinct in the wild since 2002) * Alagoas Curassow (extinct in the wild since 1987 or 1988) * Socorro Dove (extinct in the wild since 1972) * Guam Rail (extinct in the wild since 1980) * Black Soft-shell Turtle * Butterfly Goodeid * Partula (genus) * Scimitar Oryx