Calliostoma retiarium Hedley & May, 1908 (original description) Selastele retiarium, common name the netted top shell, is a species of sea snail, a marine gastropod mollusc in the family Calliostomatidae.

The small, subperforate shell has a conical shape with sharply keeled periphery, overlapping spire whorls and a flat base.

Sculpture: small spiral threads parted by wider interstices amount to seven on the penultimate, and to twenty on the body whorl.

The radials are irregular oblique wave-like folds, twenty-two on the body whorl, which raise beads on the keel rows, and there cease abruptly.

[2] This marine species occurs off South Australia, Victoria and Tasmania at depths between 170 m and 180 m.