Phenacomargarites williamsae is a species of sea snail, a marine gastropod mollusk, in the family Calliostomatidae within the superfamily Trochoidea, the top snails, turban snails and their allies.

[1][2] The length of the shell attains 22.1 mm.

This marine species occurs off the Solomon Islands This Calliostomatidae-related article is a stub.

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