Cythara coniformis is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
This species is considered a nomen dubium.
The length of the shell attains 9 mm.
The thin, whitish shell is rather transparent. It is faintly plicate on the upper part of the whorls and transversely very faintly striated.[1]
This marine species occurs off Hawaii