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The oblong rocksnail, scientific name ''Leptoxis compacta'', is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species is endemic to the Cahaba River in Alabama, United States. It was thought to be extinct due to habitat loss since it had not been collected since 1933,〔 and was formally declared extinct in 2000.〔 The IUCN Red List listed it as extinct in 2006〔Bogan A. E. (2000). "(''Leptoxis compacta'' )". (2006 IUCN Red List of Threatened Species ). Downloaded on 7 August 2007.〕 and in 2012.〔Bogan A. E. (Mollusc Specialist Group) (2000). "(''Leptoxis compacta'' ). In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.1. Molecular systematic analyses are underway to clarify the genetic position of ''Leptoxis compacta''.〔 == Distribution == ''Leptoxis compacta'' is restricted to a single location in the Cahaba River,〔 where it was rediscovered in 2011.〔 It lives in an unnamed shoal upstream of the Cahaba River and Shades Creek confluence in Shelby County, Alabama (33.1786°N, 87.0174°W).〔 Historically, ''Leptoxis compacta'' was most abundant in the central section of the Cahaba River at Lily Shoals in Bibb County, Alabama.〔 The historical range of ''Leptoxis compacta'' extended from Centerville, Bibb County, upriver and into lower Buck Creek in the Valley and Ridge physiogeographic province of the southern Appalachian Mountains.〔 Specific reasons for the species decline of ''Leptoxis compacta have not been determined, but it is known that the species was declining in abundance and range by 1935, and it is suggested that factors contributing to the decline included its naturally small range and pollutant loadings to streams from mines and from the Birmingham, Alabama metropolitan area.〔 This species was the only pleurocerid endemic to the Cahaba River that was considered extinct,〔 and had not been found in surveys of the river conducted in 1992, 2005, and 2008.〔Tolley-Jordan LR (2008) The biology of Pleuroceridae (Gatropoda: Caenogastropoda) in the Cahaba River Basin, Alabama. Tuscaloosa: University of Alabama Press. 239.〕 This snail is highly susceptible to a single catastrophic extinction event.〔 As such, the species deserves immediate conservation attention.〔 Artificial propagation and reintroduction of ''Leptoxis compacta'' into its native range may be a viable recovery strategy to prevent extinction from a single perturbation event.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Oblong rocksnail」の詳細全文を読む スポンサード リンク
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