Cassidae

（重定向自Helmet shell）

The Cassidae are a taxonomic family of medium-sized, large, and sometimes very large sea snails commonly called helmet snails or bonnet snails. These are marine gastropod mollusks in the superfamily Tonnoidea and the clade Littorinimorpha.

About 60 species comprise the family Cassidae; an example is Cypraecassis rufa.

单词	Helmet shell
释义	Helmet shell 英语百科 Cassidae （重定向自Helmet shell） The Cassidae are a taxonomic family of medium-sized, large, and sometimes very large sea snails commonly called helmet snails or bonnet snails. These are marine gastropod mollusks in the superfamily Tonnoidea and the clade Littorinimorpha. About 60 species comprise the family Cassidae; an example is Cypraecassis rufa.
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