| 词条 | Snake River physa snail |
| 释义 |
| name = Snake River physa snail | image = | status = DD | status_system = IUCN2.3 | status_ref = [1] | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Heterobranchia clade Euthyneura clade Panpulmonata clade Hygrophila | superfamilia = Planorboidea | familia = Physidae | genus = Physella | species = P. natricina | binomial = Physella natricina | binomial_authority = Taylor, 1988 | synonyms = Haitia (Physa) natricina Taylor, 1988 }} The Snake River physa snail, scientific name Physella natricina, is a species of freshwater snail, an aquatic gastropod mollusk in the family Physidae. This species is endemic to Idaho in the United States. The Snake River physa snail Haitia (Physa) natricina Taylor, 1988 is found in the middle Snake River of southern Idaho. DescriptionThis species has an ovoid shell that is amber to brown in color, and has 3 to 3.5 whorls. It can reach a maximum length of about 6.5 mm. EcologyWhile much information exists on the family Physidae in general, very little is known about the biology or ecology of this particular species. Habitat and distributionThis snail is believed to be confined to the Snake River, inhabiting areas of swift current on the undersides of large cobbles and boulder-sized rocks. In 1995, the U.S. Fish and Wildlife Service reported the known modern range of the species to be from Grandview, Idaho (ca. RM 487) to the Hagerman Reach of the Snake River (ca. RM 573). The Snake River physa is believed to have evolved during the Pleistocene-Holocene in the lakes and rivers of northern Utah and southeastern Idaho. It is thought that the species may have existed in the Snake River since approximately 3.5 million years ago. ConservationThe Snake River physa is rare, with fewer than 50 total individuals having been collected. The recovery area for the species extends from Snake River mile 553 to Snake River mile 675. It is currently listed as an Endangered species since 14 December 1992.[2] References
1. ^Mollusc Specialist Group 1996. Physella natricina. 2006 IUCN Red List of Threatened Species. Downloaded on 7 August 2007. {{Taxonbar|from=Q3076764}}{{DEFAULTSORT:Snake River Physa Snail}}2. ^1 U.S. Fish and Wildlife Service (Last updated 5 January 2010) "Species Profile for Snake River Physa snail (Physa natricina)". U.S. Fish and Wildlife Service accessed 6 January 2010. 6 : Physidae|Endemic fauna of the United States|Natural history of Idaho|Gastropods described in 1988|Taxonomy articles created by Polbot|ESA endangered species |
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