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or patelliform (limpet-like) gastropod shell is called the apical cavity.

Scaphopods

The apex of tusk shells is the small, open posterior end, and the opening itself is usually called the apical aperture.

Cephalopods

In orthocone cephalopods, the pointed end of the shell is called the apex, and shell growth is away from the apex and toward the aperture. The first chamber of the

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