Tag Archives: Washoe County

Pyrgulopsis nevadensis (Stearns)

Lake Pyramid Pyrg (Pyrgulopsis nevadensis)

The Lake Pyramid Pyrg was described in 1883, it was restricted to the Pyramid Lake in Washoe County in Nevada, USA. 

The exact date of its disapeerance appears not to be known, however, the last specimens collected alive date from the very late 1800s, and despite the fact that shells are still commonly found, no living specimen was ever found since and the species is obviously extinct. [1]


The Lake Pyramid Pyrg also inhabited Walker Lake in Mineral County, Nevada, however, this population is only known from fossil remains and eppaers to be of Pleistocene age. [1]



[1] Robert Hershler: A review of the North American freshwater snail genus Pyrgulopsis (Hydrobiidae). Smithsonian Contributions to Zoology 554: 1-115. 1994


Photo: Corey Lange

(under creative commons license (4.0))


edited: 01.05.2019