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Diagnosis: Thick-walled spherical shell, with small circular pores about 1-2 times bar width. Mouth relatively small, with a ring of teeth and 1-3 main-spines, of which one is sculptured in a net-like pattern. Thick main-spines, length about half the shell radius. Numerous by-spines, about 3 times pore width.

Diameter: 0.8-1.0 mm.

Castanissa valdiviae