左锥螺科（学名：Triphoridae），又名锥折螺科[1]:39、三孔螺科[2]或三口螺科[3]，是新进腹足类支序腹足纲软体动物之下翼舌类非正式群组一个海螺的科。本科物种的体积皆非常小，几乎全部都可归类为微小贝，而且几乎所有贝壳的手性皆为左旋[4]。在较旧的分类，本科是异腹足目的成员[5]。
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本科物种螺壳的体积皆属小型，而且有很多层卷曲，
and extremely high-spired, with numerous narrow whorls which often have distinctive sculpture.
本科物种大多数螺壳的手性皆为左旋[4]，这一点在海洋腹足纲软体动物来讲比较罕见[6]。
布歇特和洛克罗伊的腹足类分类 (2005年)列出左锥螺科物种可分为下列三个亚科[7]：
- 三口螺亚科 Iniforinae Kosuge, 1966
- Metaxiinae Marshall, 1977
- 左锥螺亚科 Triphorinae Gray, 1847
综合TaiBIF、ITIS及其他参考文献，本科包括下列各属[5][8][9][10][4]：
- 三口螺亚科 Iniforinae Kosuge, 1966：皆为海洋物种[11][12]；
- Differoforis Kosuge, 2008[13][11][14][15]；异名：Risbecia Kosuge, 1966[13][11][14][15]
- 三口螺属 Iniforis Jousseaume, 1884
- Mastoniaeforis Jousseaume, 1884；异名有：Contraforis Laseron, 1958、Epiforis Laseron, 1958、Mastoniaeformis（拼写错误）
- Metaxiinae Marshall, 1977
- †Antiphora Nützel, 1997
- †Eorex Nützel, 1997
- Metaxia Monterosato, 1884
- 左锥螺亚科 Triphorinae Gray, 1847
- Aclophora Laseron, 1958
- Aclophoropsis B. A. Marshall, 1983
- 布氏左锥螺属 Bouchetriphora B. A. Marshall, 1983
- †Callitriphora Cotton, 1947
- Cautor Finlay, 1926
- Cautotriphora Laws, 1940
- Cheirodonta B. A. Marshall, 1983
- †Cinctrifora Olsson & Harbison, 1953
- 玄珠螺属 Coriophora Laseron, 1958
- Cosmotriphora Olsson & Harbison, 1953
- Costatophora B. A. Marshall, 1994
- †Eocautor Eames, 1952
- †Epetrium G. F. Harris & Burrows, 1891
- 扁粒螺属 Euthymella Thiele, 1929
- Eutriphora Cotton & Godfrey, 1931
- Hedleytriphora B. A. Marshall, 1983
- Huetriphora Caro & Bertrand, 2020：只有Huetriphora raymondi Caro & Bertrand, 2020，一个物种，见于非洲印度洋的留尼汪[16][17]；
- Hypotriphora Cotton & Godfrey, 1931
- 格粒螺属 Inella Bayle, 1879
- Ionthoglossa Vinola-Lopez & Bouchet, 2020：只有一个物种Ionthoglossa pseudocanarica (Bouchet, 1985)，旧属Cosmotriphora属，分布于地中海及大西洋东北部[18][19]；异名：Pogonodon Bouchet, 1997；
- Isotriphora Cotton & Godfrey, 1931
- Latitriphora B. A. Marshall, 1983
- Liniphora Laseron, 1958
- Litharium Dall, 1924
- Magnosinister Laseron, 1954
- Marshallora Bouchet, 1985
- 双珠螺属 Mastonia Hinds, 1843
- Monophorus Grillo, 1877：异名有Notosinister Finlay, 1926（即参珠螺属[5]）；
- Nanaphora Laseron, 1958
- †Norephora Gründel, 1975
- Nototriphora B. A. Marshall, 1983
- Obesula Jousseaume, 1897
- †Ogivia G. F. Harris & Burrows, 1891
- Opimaphora Laseron, 1958
- †Oriforina Gründel, 1975
- Sagenotriphora B.A. Marshall, 1983
- Seilarex Iredale, 1924
- Similiphora Bouchet, 1985
- Strobiligera Dall, 1924
- Subulophora Laseron, 1958
- †Subviriola Amitrov & Zhegallo, 2007
- Sychar Hinds, 1843
- Talophora Gründel, 1975
- Teretriphora Finlay, 1927
- 左锥螺属 Triphora de Blainville, 1828[20]
- 双肋螺属 Viriola Jousseaume, 1884
- Viriolopsis B. A. Marshall, 1983
- 异名：
- Biforina Bucquoy, Dautzenberg & Dollfus, 1884 : synonym of Monophorus Grillo, 1877
- Brucetriphora Beu, 2004: synonym of Costatophora B. A. Marshall, 1994
- Distophora Laseron, 1958:synonym of Cautor Finlay, 1927
- Epiforis Laseron, 1958:synonym of Mastoniaeforis Jousseaume, 1884
- Euthymia Jousseaume, 1884:synonym of Euthymella Thiele, 1929
- Ino Hinds, 1843:synonym of Inella Bayle, 1879
- Macrosinister:synonym of Magnosinister Laseron, 1954
- Mastoniaeformis [sic] : synonym of Mastoniaeforis Jousseaume, 1884
- Mesophora Laseron, 1958[5]：Coriophora Laseron, 1958的旧称，因与其他分类单元同名而于2013年改名。
- Orbitophora Laseron, 1958:synonym of Viriola Jousseaume, 1884
- Risbecia Kosuge, 1966:synonym of Differoforis Kosuge, 2008
- Sinistroseila W. R. B. Oliver, 1915: synonym of Viriola Jousseaume, 1884
- Solosinister Laseron, 1954:synonym of Viriola Jousseaume, 1884
- Tetraphora Laseron, 1958:synonym of Brucetriphora Beu, 2004
- Torresophora Laseron, 1958: synonym of Euthymella Thiele, 1929
- Triforis Deshayes, 1834:synonym of Triphora Blainville, 1828
- Triphoris:synonym of Triphora Blainville, 1828
林朝棨. 蘭嶼之貝類及其動物地理. 中国贝志 (中华民国贝类学会). 1974, 1: 42–63 [2018-10-10] （中文（繁体））.
潘华璋; 蓝琇. 西沙群岛软体动物 (PDF). 古生物学报. 1998年, 37 (1): 122 [2018-08-20]. （原始内容存档 (PDF)于2017-12-24） （中文（简体））. Dekker H, Bouchet P, Rosenberg G. Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O , 编. Iniforinae Kosuge, 1966. MolluscaBase. 2022-01-15 [2022-10-14] –通过WoRMS. Kosuge, S. Differoforis Kosuge, gen. nov. for the substitute of Risbecia Kosuge 1966 (Gastropoda, Triphoridae). Bulletin of the Institute of Malacology, Tokyo. 2008, 3 (9): 134 （英语）.
Dekker H, Marshall B, Rosenberg G. Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O , 编. Differoforis Kosuge, 2008. MolluscaBase. 2022-01-15 [2022-10-14] –通过WoRMS. Dekker H, Marshall B, Rosenberg G. Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O , 编. Risbecia Kosuge, 1966. MolluscaBase. 2022-01-16 [2022-10-14] –通过WoRMS. Caro, O. & Bertrand, A. Huetriphora raymondi nov. gen. & nov. sp. de l'infralittoral, île de la Réunion (Mollusca: Gastropoda: Triphoridae) [留尼汪岛近海（软体动物：腹足纲：Triphoridae）]. Bulletin de la Société Linnéenne de Lyon (PDF). 2020, 89 (9-10): 275–281 （法语）.
Dekker H, Bouchet P. Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O , 编. Huetriphora Caro & Bertrand, 2020. MolluscaBase. 2022-01-16 [2022-10-14] –通过WoRMS. Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O (编). Ionthoglossa pseudocanarica (Bouchet, 1985). MolluscaBase –通过WoRMS. de Blainville (1828). Dict. Sci. Nat. 55: 344.
