Las Vegas Dace (Rhinichthys deaconi)  

The Las Vegas Dace was described in 1984, it was declared extinct in 1986, only two years later.  

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The Las Vegas Valley in Nevada, USA originally was formed by a river, this river, however, started to disappear at 4000 to 1000 BCE., leaving behind only three springs and becoming merely a dry wash.  

The last Las Vegas Daces were cought in 1940 (but were not recognized as being distinct), they apparently survived in one of the springs and outflows until 1955 to 1957, but disappeared sometimes before 1967.  

The creek that formerly held the three springs is now obviously completely dry.  

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References:  

[1] Robert Rush Miller: Rhinichthys deaconi, a new species of dace (Pisces: Cyprinidae) from southern Nevada. Occasional Papers of the Museum of Zoology University of Michigan 707: 1-21. 1984  

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edited: 23.04.2019