columella

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columella

shell structure

Learn about this topic in these articles:

snail anatomy

In gastropod: The shell
…a central axis called the columella. Generally, the coils, or whorls, added later in life are larger than those added when the snail is young. At the end of the last whorl is the aperture, or opening. The shell is secreted along the outer lip of the aperture by the…
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