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Naegele springsnail : ウィキペディア英語版 | Naegele springsnail
The Naegele springsnail, also known as the Presidio County springsnail, scientific name ''Pyrgulopsis metcalfi'', is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Its natural habitat is springs. It is threatened by habitat loss. ==References==
* Mollusc Specialist Group 2000. (Pyrgulopsis metcalfi ). * (2006 IUCN Red List of Threatened Species. ) Downloaded on 7 August 2007.
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