Panama Zetekina Snail (Zetekina panamensis)  

The Panama Zetekina Snail was endemic to the Río Matasnillo, which runs through Panama City, the capital of Panama.  

The species is now considered extinct, probably as a result of water pollution. [1]  

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References:  

[1] Fred G. Thompson: An annotated checklist and bibliography of the land and freshwater snails of México and Central America. Bulletin of the Florida Museum of Natural History 50(1): 1-299. 2011