Drilliidae
Introduction 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. It consists of about 30 genera and approximately 500 Recent species.
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.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.
Distribution This family has wide distribution, ranging from Iceland to the Antarctic Ocean, found at intertidal to abyssal depths. This is reflected in the variability in larval shells and the size of the shell (from a few millimetres to 6 cm) and the characteristics of the protoconch and the teleoconch.
Taxonomic history The genera in this family were originally separated from the subfamily Clavitulinae and classified by H.& A. Adams (1858) under subfamily Turritinae, because their operculum has a terminal instead of a central nucleus. In 1942, the species with a U-shaped sinus and a parietal callus pad were brought by Powell in the new subfamily Clavinae. In 1966, Morrison proposed the subfamily Drillinae (= Clavinae) for the species with a stenoglossan radula with comb-like lateral teeth. Finally, in 1993, Taylor ''et al.'' proposed the promotion of Drillinae from subfamily to the family level Drilliidae.
Taxonomy Genera in the family Drilliidae include:* ''Acinodrillia'' Kilburn, 1988* ''Agladrillia'' Woodring, 1928* ''Bellaspira'' Conrad, 1868* ''Calliclava'' McLean, 1971* ''Cerodrillia'' Bartsch & Rehder, 1939* ''Clathrodrillia'' Dall, 1918* ''Clavus'' Montfort, 1810* ''Conopleura'' Hinds, 1844 * ''Crassopleura'' Monterosato, 1884* ''Cruziturricula'' Marks, 1951 * ''Cymatosyrinx'' Dall, 1889* ''Decoradrillia'' Fallon, 2016 * ''Douglassia'' Bartsch, 1934* ''Drillia'' Gray, 1838* ''Elaeocyma'' Dall, 1918* ''Eumetadrillia'' Woodring, 1928 * ''Fenimorea'' Bartsch, 1934* ''Fusiturricula'' Woodring, 1928 * ''Globidrillia'' Woodring, 1928* ''Hauturua'' Powell, 1942 * ''Imaclava'' Bartsch, 1944* ''Iredalea'' Oliver, 1915* ''Kylix'' Dall, 1919* ''Leptadrillia'' Woodring, 1928* ''Lissodrillia'' Bartsch & Rehder, 1943* ''Neodrillia'' Bartsch, 1943* ''Orrmaesia'' Kilburn, 1988* ''Paracuneus'' Laseron, 1954* ''Plagiostropha'' Melvill, 1927*  † ''Pleurofusia'' de Gregorio, 1890* ''Sedilia'' Fargo, 1953* ''Spirotropis'' Sars, 1878* ''Splendrillia'' Hedley, 1922* ''Stenodrillia'' Korobkov, 1955 * ''Syntomodrillia'' Hedley, 1922* ''Wairarapa'' Vella, 1954;Genera brought into synonymy:* ''Brephodrillia'' Pilsbry & Lowe, 1932: synonym of ''Iredalea''* ''Clavicantha'' Swainson, 1840: synonym of ''Clavus'' Montfort, 1810* ''Eldridgea'' Bartsch, 1934: synonym of ''Clavus'' Montfort, 1810* ''Fusisyrinx'' Bartsch, 1934: synonym of ''Fusiturricula'' Woodring, 1928* ''Tylotia'' Melvill, 1917: synonym of ''Clavus'' Montfort, 1810* ''Tylotiella'' Habe, 1958: synonym of ''Clavus'' Montfort, 1810;Genera moved to other families:* ''Austroclavus'' (unassigned to a family within Conoidea)* ''Brachytoma'' moved to the family Pseudomelatomidae* ''Sediliopsis'' Petuch, 1988 : moved to the family Pseudomelatomidae
References *  The Taxonomicon
External links *  PHILLIP J. Jr. FALLON, Taxonomic review of tropical western Atlantic shallow water Drilliidae (Mollusca: Gastropoda: Conoidea) including descriptions of 100 new species;  Zootaxa, S.l., v. 4090, n. 1, p. 1–363, mar. 2016.ISSN 1175-5334*  WMSDB - Worldwide Mollusc Species Data Base: family Drilliidae