Spire (mollusc)
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A spire is a descriptive term for part of the shell of a snail, a gastropod mollusc shell or gastropod shell. The spire consists of all of the whorls of a coiled gastropod shell except for the body whorl.

Some different types of spire

Turbinoform or Turbinate: having a broadly conical spire and a convex base, as in Turbo, turban-shaped.

Turriform: with a many-whorled, slender spire, as in Turritella.

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