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any of several marine snails of the subclass Prosobranchia (class Gastropoda) comprising the genus Conus and the family Conidae. The shell is typically straight-sided, with a tapering body whorl, low spire, and narrow aperture (the opening into the shell's first whorl). Cones inject a paralyzing toxin by means of a dart; a few of the larger species have fatally stung humans. The usual prey is worms and mollusks; a few capture fish. Most species occur in the Indo-Pacific region