Shell large for the genus. The shape is conical, the upper spire whorls are almost straight, the later whorls convex. Protoconch translucent and elevated. First three whorls are reddish brown in color. On the first whorls already a reticulate pattern of dense rows of fine spiny granules. Shell with about 7 whorls. The reticulate sculpture from the first whorl changes in a sculpture of three major spiral ribs with sharp small knobs in between. About 5 secondary spiral ribs, much weaker, also covered with numerous small spiny knobs. The suture is hard to detect, situated below the major spiral rib. There are 86 sharp knobs on the peripheral rib on the body whorl. The rounded body whorl goes over into the base that counts 17 spiral rows of equal strength. Umbilicus white and closed with an oblique columella, which is thickened. The color of the base is cream white with a pattern of yellow brown irregular flecks. Aperture inside is iridescent white and bears 8 labial plicae. Overall color of the shell is cream white with a pattern of yellow brown flecks on the major spiral ribs.

Calliostoma anseeuwi n. sp. is close to Calliostoma sakashitai (Sakurai, 1994). However, the new species is twice as big as G sakashitai. Aside from the big size, it has a finer sculpture compared to C. sakashitai. C. sakashitai can also be distinguished by the faint to obvious purple spiral bands and the more slender outline.

TYPE LOCALITY
The Philippines, "Bohol".
DISTRIBUTION AND HABITAT
Only known from the type locality. Most probably taken by tangle nets in Panglao Island.