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Diagnosis: Very thick spherical shell, with large circular to oval pores, 1-2 times bar width, framed. Circular mouth (about 3 times pore width) with 2 short conical main-spines. Main-spines fairly sparse, relatively short (about 4 times pore width), some slightly curved. By-spines long (about 3 times pore width) and slender.

Diameter: 0.7 mm.

Castanidium vanhoeffeni