Xanthodaphne sofia is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

(Original description) The small, delicate shell is whitish, with a four-whorled brown, trochiform, sinusigera protoconch and four subsequent rather slender whorls.

The transverse sculpture consists of faint delicate lines of growth, which are puckered or gathered into a sort of narrow frill or band, appressed against the suture and bounded in front by the smooth anal fasciole, on which the anterior ends of the wavelets become obsolete.

The spiral sculpture is rather strong on the periphery of some of the earlier whorls, but elsewhere consists of faint threads and grooves which are extended forward more or less distinctly to the end of the siphonal canal.

Its edge is slightly reflected and so twisted as to make the axis of the shell, viewed from the anterior end, minutely pervious.