Architectonicidae are flattened shells with lenticular edge appearance. The whorls are widening as the snails grows leaving a deep and wide umbilicus typical of the family. The operculum is typically horny.

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Architectonica maxima (Giant sundial)
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Architectonica maxima (Giant sundial)

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Architectonica perspectiva (Perspective sundial shell)
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Architectonica perspectiva (Perspective sundial shell)

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Discotectonica acutissima (Sharp-edged sundial)
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Discotectonica acutissima (Sharp-edged sundial)

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