扁蜷科

扁蜷科（），亦作扁卷螺科，是腹足綱之下的一個單系群支序，本科物種皆為可呼吸空氣的淡水螺，與一般腹足綱物種的外殼形狀不同。外殼看似是右旋，但其實是螺把殼上下顛倒來揹在身上，使左旋的外殼看起來像是右旋。
因其外形，本科物種又稱。

由於本科物種的頭和腹足都比較細小，使得牠們頭上絲般幼的觸角顯得很細長。

分類
對於部份分類元來說，是否應該歸入扁蜷科仍有爭議。這對於淡水帽貝Ferrissia跟Ancylus這兩個屬來說由其合適。這些屬有時會被歸入椎实螺科（Lymnaeidae Rafinesque, 1815）；另外亦有文獻把上述兩個屬放進各自的一個科裡。然而，在布歇和羅克魯瓦的腹足類分類分析過本科部分物種，based on sequences of mitochondrial 18S ribosomal DNA and cytochrome-c oxidase I (COI) genes, and on the basis of the results, they rearranged the taxonomy like this:

"A-clade" sensu Albrecht et al. (2007)。以下綜合三份文獻的結果：
of the shell of Anisus septemgyratus]]

• 扁蜷亞科 Planorbinae Rafinesque, 1815

** ?
**多旋螺屬 Anisus* S. Studer, 1820
*** subgenus Disculifer* C. Boettger, 1944
** Bathyomphalus* Charpentier, 1837
** 旋螺属 Gyraulus* Charpentier, 1837
*** subgenus Torquis* Dall, 1905
*** subgenus Lamorbis* Starobogatov, 1967
*** subgenus Armiger* Hartmann, 1843
** 平扁蜷屬 Hippeutis* Charpentier, 1837：又名圓扁螺屬
** tribe Ancylini Rafinesque, 1815
** Ancylus* O. F. Müller, 1773 - type genus of tribe Ancylini
** tribe Biomphalariini H. Watson, 1954
** Biomphalaria* Preston, 1910 - type genus of tribe Biomphalariini。
* Planorbarius* Duméril, 1806
* Planorbella* Haldeman, 1842
* Menetus* H. Adams & A. Adams, 1855
** subgenus Dilatata* Clessin, 1885
** tribe Bulinini P. Fischer & Crosse, 1880
** Bulinus* O. F. Müller, 1781 - type genus of subfamily Bulininae
||Fossulorbis |Pilsbry, 1934
||Glyptophysa |Crosse, 1872
||Helicorbis |Benson, 1855
||Helisoma |Swainson, 1840
||Intha |Annandale, 1922
||Isidorella |Tate, 1896
||Kessneria |Walker & Ponder, 2001
||Leichhardtia |Walker, 1988
||Lentorbis |Mandahl-Barth, 1954
||Macrophysa |(Meek) Dall, 1870
||Paraplanorbis |Hanna, 1922
||Patelloplanorbis |Hubendick, 1957
||Pecosorbis |D.W. Taylor, 1985
||Pentagoniostoma |Branson, 1935
||Perrinilla |Hannibal, 1912
||Physastra |Tapparone-Canefri, 1883
||Physopsis |Krauss, 1848
||Pingiella |F.C. Baker, 1945
||Pitharella |F. Edwards, 1860
||Planorbifex |Pilsbry, 1935
||Planorbina |Haldeman, 1842
||Platyphysa |P. Fischer, 1883
||Platytaphius |Pilsbry, 1924
|多脉扁螺属 |Polypylis |Pilsbry, 1906
||Promenetus |F.C. Baker, 1935
||Protancylus |P. & F. Sarasin, 1897
||Pygmanisus |Iredale, 1943
||Segmentorbis |Mandahl-Barth, 1954
||Sineancylus |Gutiérrez Gregoric, 2014
||Syrioplanorbis |F.C. Baker, 1945
||Trochorbis |Benson, 1855
||Vorticifex |Meek in Dall, 1870
}}

The genus Camptoceratops Wenz, 1923 is no longer considered to be a planorbid. It was recognised by Curry (1965, p. 360) as a euthecosomatous pteropod (Heterobranchia) (note by Arie W. Janssen, 092507).

属名 Taphius H. Adams & A. Adams, 1855 为Biomphalaria的异名。

}}

外部連結

• [http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?lin=s&p=has_linkout&id=6524 NCBI Taxonomy Browser: Planorbidae]
• [http://sn2000.taxonomy.nl/Taxonomicon/TaxonTree.aspx?id=38514&tree=0.1 Systema naturae 2000 (classification) - Taxon: Planorbidae]

*

• http://mkohl1.net/Planorbidae.html
• [https://archive.org/stream/molluscanfamilyp00bake#page/n9/mode/2up Frank Collins Baker, The Molluscan Family Planorbidae, The University of Illinois press, Urbana, 1945]