Modulus modulus, commonly known as the buttonsnail, is a species of small sea snail, a marine gastropod mollusc in the family Modulidae.

[1] The distribution of this species includes both the east and west coast of Florida.

[citation needed] The maximum recorded shell length is 16.5 mm.

[2] The overall shape of the shell is button-like, with a gray or brown streaked, ridge-sculptured body whorl and a low spire.

[citation needed] The minimum recorded depth is 0 m.[2] The maximum recorded depth is 105 m.[2] Found in shell grit and coral sand, among sea grass beds -at 2 to 3 feet depth.