Tack-shaped
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Title
Tack-shaped
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Definition
The form of an operculum that possesses a woody extension from the middle of its interior. The opeculum and its extension appear like a large tack.
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Notes
Species of Allantoma, Cariniana, and Couratari have tack-shaped opercula. The columella is derived from the upper septum of species of these genera.
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Related Terms
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