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One of the coils in a molluscan shell. Whorls are most noticeable among Gastropoda and Cephalopoda, in which the shell is a hollow cone that grows only at the apertural end and tends to curl about its vertical axis. In most molluscs the coils form a helix in which each whorl is attached to the next, but in some the coiling is loose.

Subjects: Zoology and Animal Sciences.

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