| 词条 | Marstonia castor |
| 释义 |
| name = Marstonia castor | image = | status = CR | status_system = IUCN3.1 | status_ref = [1] | regnum = Animalia | phylum = Mollusca | superfamilia = Rissooidea | familia = Hydrobiidae | genus = Marstonia | species = M. castor | binomial = Marstonia castor | binomial_authority = F. G. Thompson, 1977 | synonyms = Pyrgulopsis castor (F. G. Thompson, 1977) }} Marstonia castor, common name the beaver pond marstonia, is a species of very small freshwater snail with a gill and an operculum, an aquatic operculate gastropod mollusk in the family Hydrobiidae. This species was endemic to a very limited area of the US state of Georgia, mostly to streams and creeks around Lake Blackshear. The US Fish and Wildlife Service declared this species extinct in December 2017 on the basis that it had not been seen since 2000. It was likely wiped out by groundwater withdrawal, pollution, and urbanization.[2][3] However, the IUCN Red List still lists it as Critically Endangered. References1. ^{{Cite journal | author = Cordeiro, J. | author2 = Perez, K. | last-author-amp = yes | title = Marstonia castor | journal = The IUCN Red List of Threatened Species | volume = 2012 | page = e.T18961A1929774 | publisher = IUCN | date = 2012 | url = http://www.iucnredlist.org/details/18961/0 | doi = 10.2305/IUCN.UK.2012.RLTS.T18961A1929774.en | access-date = 15 January 2018}} 2. ^{{Cite web|url=http://www.biologicaldiversity.org/news/press_releases/2017/beaverpond-marstonia-12-28-2017.php|title=Georgia Snail Is First Species Declared Extinct Under Trump Administration|website=www.biologicaldiversity.org|access-date=2018-01-07}} 3. ^{{Cite news|url=https://www.nbcchicago.com/news/national-international/Tiny-Snail-Species-Georgia-Extinct--467685443.html|title=Tiny Snail Species Unique to Georgia Declared Extinct|work=NBC Chicago|access-date=2018-01-07|language=en}} External links
4 : Molluscs of the United States|Hydrobiidae|Gastropods described in 1977|Taxonomy articles created by Polbot |
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