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The Drilliidae are a taxonomic family of small predatory sea snails with high-spired shells. They are classified as marine gastropod mollusks in the superfamily Conoidea. This family has no subfamilies. ==Description== The shell is claviform with a tall spire, or squatly conical to biconical. In many species, the siphonal canal is truncated. The aperture is U-shaped with a parietal callus pad. The sculpture of the shell shows prominent axial ribs with a polished surface. Most species have a dorsal varix (transverse elevation), except in the genera ''Cymatosyrinx'', ''Elaeocyma'' and ''Splendrillia''. The protoconch can be smooth or very carinate. The ovate operculum has a terminal nucleus.〔( Chen-Kwoh Chang, ''Small Turrids of Taiwan, Chapter 3 , History and Taxonomy of the Clavidae; June 1, 2001 )〕 The radula of the species in this family have characteristically five teeth in each row (formula : 1 + 1 + 1 + 1 + 1) with a vestigial central tooth, comb-like lateral teeth and a pair of flat-pointed, slender marginal teeth. The foregut structure of the anterior alimentary system has the least derived foregut anatomy of all the families in the superfamily Conoidea.〔( Brian Morton, The Malacofauna of Hong Kong and southern China )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Drilliidae」の詳細全文を読む スポンサード リンク
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