[3] This tropical marine species occurs in the Western Pacific off Japan and the Philippines, found at depths between 200 and 500 m (660 and 1,640 ft).

Some specimens lack the rose-coloured line round the umbilical callosity.

The outer surface is slightly rugose, by irregular wrinkles, almost parallel with the basal margin of the operculum.

[2] Embryos of Guildfordia yoka develop into free-swimming planktonic larvae with several bands of cilia (trochophore).

Later they develop into juvenile veligers, finally into fully grown adults.