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Modulus modulus is a species of small sea snail, a marine gastropod mollusk in the family Modulidae.
Modulus modulus Wikipedia
The distribution of this species includes both the east and west coast of Florida.
The maximum recorded shell length is 16.5 mm. The overall shape of the shell is button-like, with a gray or brown streaked, ridge-sculptured body whorl and a low spire.
The minimum recorded depth is 0 m. The maximum recorded depth is 105 m.