膀胱螺屬

膀胱螺屬（學名：Physa），又名囊螺屬^[4]，屬軟體動物門腹足綱異鰓類泛有肺類喜溼螺類支序的膀胱螺科，是一種細小的淡水螺，能在空氣呼吸。本屬的學名「Physa」在[古希腦語]]的意思就是「風箱」^[5]。

膀胱螺屬
五枚泉膀胱螺（Physa fontinalis）的螺殼
保護狀況
NE[2]
科學分類
界：	動物界 Animalia
門：	軟體動物門 Mollusca
綱：	腹足綱 Gastropoda
科：	膀胱螺科 Physidae
亞科：	膀胱螺亞科 Physinae
族：	膀胱螺族 Physellini
屬：	膀胱螺屬 Physa Draparnaud, 1801[1]

A live individual of Physa marmorata

本屬物種以藻類、矽藻及碎屑為食。

物種

現存物種：

• 尖膀胱螺（Physa acuta Draparnaud, 1805）
• Physa ancillaria (Say, 1825) - Pumpkin Physa^[6]
• Physa carolinae Wethington, Wise & Dillon, 2009^[7]
• Physa concolor
• 泉膀胱螺（Physa fontinalis (Linnaeus, 1758)）：模式種
• Physa hordacea (I. Lea, 1864)
• Physa jennessi Dall, 1919
• Physa lordi (Baird, 1863)
• Physa marmorata Guilding, 1828^[8] - synonyms: Physa mosambiquensis Clessin, 1886 and Physa waterloti^[8]
• Physa megalochlamys Taylor, 1988
• † Physa mezzalirai Ghilardi, Carbonaro & Simone, 2011 - fossil from Brazil^[9]
• Physa natricina Taylor, 1988
• Physa nuttalli
• Physa propingua (Tryon, 1865)
• Physa pumilia Conrad, 1834
• Physa siberica Westerlund, 1876
• Physa skinneri Taylor, 1954
• Physa vernalis Taylor et Jokinen, 1984
• Physa sp., Lake Winnipeg Physa, lives in Manitoba in Canada. It was classified as endangered by COSEWIC. COSEWIC recommendation has been forwarded to the Minister of the Environment of Canada and a decision for listing at the List of Wildlife Species at Risk of the Canadian Species at Risk Act was pending in 2005.^[10]

同種異名：

• Physa acuta Draparnaud, 1805, Physa heterostropha (Say, 1817), Physa integra (Haldeman, 1841) and Physa natricina Taylor, 1988 are synonyms of Physella acuta (Draparnaud, 1805)
• Physa columbiana (Hemphill, 1890) is a synonym for Physella columbiana (Hemphill, 1890)
• Physa gyrina (Say, 1821) is a synonym for Physella gyrina'' (Say, 1821)

化石物種：

• † Physa aridi Mezzalira, 1974 - fossil from Brazil^[11]
• † 金剛口滴螺（Physa jingangkouensis）