Stigmated Aylacostoma Snail (Aylacostoma stigmaticum)

This species was described in 1954, it was endemic to highly oxygenated freshwater habitats near the Yacyretá-Apipé rapids in the high Paraná river at the border area between Argentinia and Paraguay.

The habitat disappeared when the river system was dammed, leading tot he disappearance of the endemic snail fauna, including the Stigmated Aylacostoma Snail. 

The Stigmated Aylacostoma Snail is officially listed as extinct in the wild, yet there exists no captive population or whatsoever, thus the species is definetly completely extinct. [1]

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References:

[1] Roberto E. Vogler; Ariel A. Beltramino; Juana G. Peso; Alejandra Rumi: Threatened gastropods under the evolutionary genetic species concept: redescription and new species of the genus Aylacostoma (Gastropoda: Thiaridae) from High Paraná River (Argentina–Paraguay). Zoological Journal oft he Linnean Society 172: 501-520. 2014

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edited: 24.11.2018