唐冠螺科（学名：Cassidae）[1]:171，亦作冠螺科，是一个腹足纲软体动物的科，其物种为中型到大型、甚至很大型的海螺[2]。旧属中腹足目及异腹足目，今属玉黍螺类支序鹑螺总科[2][3]。
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本科现时有约60个物种，例如：万宝螺（Cypraecassis rufa）。
若按唐冠螺属的学名来命名，本科的学名应作“Cassididae”，但这样就会跟另一种甲虫分类龟金花虫科
的学名Cassididae Stephens, 1831 (基于Cassida Linnaeus, 1758，金花虫科物种，但现时已降格成为龟金花虫亚科）相冲。所以ICZN根据Opinion 1023 (1974, Bulletin of Zoological Nomenclature 31: 127-129)，接受了现时的学名，以避免重复命名的出现[2]。
本科物种分布于热带海域及温带的潮间带，水深可达100米。日间会埋在海底的沙里，到晚上才出来活动。
本物种螺壳的手性均为右旋。体型通常很大。螺厣长圆形，薄而且有尖刺，能完全覆盖其长长的壳口。水管沟直或微弯。壳口外唇较厚，内里有齿。
本科物种的外套膜很大，腹足大而且厚肉。头部有可伸缩的长鼻，可协助捕食。眼睛在一对触角的基部。
本科物种以棘皮动物（特别是海胆）为食：冠螺科物种的头部有长长的口器，连接两个大大的长鼻腺，可分泌出一种含丰富硫酸的分泌液[4]。冠螺会先用其腹足夹紧海胆，然后再分泌酸液在其外壳融解出一个洞，再从这个洞伸进齿舌去刮食海胆的肉[4]。
在布歇特和洛克罗伊的腹足类分类 (2005年)，作者依从Riedel (1995)，唐冠螺科仍然被列作鹑螺科（Tonnidae Suter, 1913 (1825)）之下的一个亚科（Cassinae Latreille, 1825）[3][5]，直到Beu (2008)在他的著作《Revision of the deep-water Cassidae》才将本分类提升到科级层次[6][7]。
本科包括下列各属[2]：
- 唐冠螺亚科 Cassinae Latreille, 1825 == 卵螺亚科 Oocorythinae P. Fischer, 1885
- 唐冠螺属 Cassis Scopoli, 1777[7]:79
- 万宝螺属 Cypraecassis Stutchbury, 1837
- Dalium Dall, 1889
- Eucorys Beu, 2008[6]
- 粗皮鬘螺属 Galeodea Link, 1807 == 粗皮卵螺属 Galeoocorys Kuroda & Habe, 1957
- Haydenia Gabb, 1864 †
- Microsconsia Beu, 2008[6]
- 卵螺属 Oocorys P. Fischer, 1884
- Sconsia Gray, 1847
- 鬘螺亚科 Phaliinae Beu, 1981
- Casmaria H. Adams and A. Adams, 1853
- Echinophoria Sacco, 1890
- 鬘螺属 Phalium Link, 1807 - bonnet shells
- Semicassis Mörch, 1852
以下各属被认为是异名：
- Bathygalea Woodring & Olsson, 1957: synonym of Echinophoria Sacco, 1890
- Benthodolium Verrill & Smith [in Verrill], 1884: synonym of Oocorys P. Fischer, 1884
- Bezoardica Schumacher, 1817: synonym of Phalium Link, 1807
- Bezoardicella Habe, 1961: synonym of Phalium Link, 1807
- Cassidaria Lamarck, 1816: synonym of Galeodea Link, 1807
- Cassidea Bruguière, 1789: synonym of Cassis Scopoli, 1777
- Echinora Schumacher, 1817: synonym of Galeodea Link, 1807
- Euspinacassis Finlay, 1926: synonym of Echinophoria Sacco, 1890
- Hadroocorys Quinn, 1980: synonym of Oocorys P. Fischer, 1884
- Morio Montfort, 1810: synonym of Galeodea Link, 1807
- Taieria Finlay & Marwick, 1937: synonym of Galeodea Link, 1807
- † Trachydolium Howe, 1926: synonym of Echinophoria Sacco, 1890
- Xenogalea Iredale, 1927: synonym of Semicassis Mörch, 1852
- Xenophalium Iredale, 1927: synonym of Semicassis Mörch, 1852
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Galeodea rugosa
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Semicassis granulata
Some helmet shells are carved into cameos, starting in Italy in 1820.
- The king helmet Cassis tuberosa was the first species to be made into cameos.
- The black helmet Cassis madagascariensis, also known as Cassis cameo, has a dark brown or a claret-coloured shell layer under a yellowish outer layer. This gives it an onyx appearance and makes it one of the most useful shells for cameos.
- The red helmet Cypraecassis rufa gives a sardonyx-like appearance because it has sard-coloured bands under its pale outer coating.
- The horned helmet Cassis cornuta produces a white figure on an orange background. It is also used as a trumpet by native Filipinos.
Gofas, S. Bouchet, P.; Gofas, S.; Rosenberg, G. , 编. Cassidae. WoRMS. 2010 [2011-01-19] –通过WoRMS. Riedel, F. An outline of Cassoidean phylogeny (Mollusca, Gastropoda). Contributions to Tertiary and Quaternary Geology. 1995, 32 (4): 97–132 （英语）.
Dance, S. Peter. 世界貝殼圖鑑 2nd. 2008.
- Abbott, R.T. (1968). The Helmet Shells of the World (Cassidae) Part 1. Indo-Pacific Mollusca 2(9): 7-201
- Kreipl K. 1997. Recent Cassidae. Christa Hemmen, Wiesbaden, 151 p
维基共享资源上的相关多媒体资源：唐冠螺科
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