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Diagnosis: Very large, thin-walled shell, with conical protuberances at main-spine bases suggesting polyhedral shape, with variable (2-8 time bar width) circular to subpolygonal pores, narrow bars. Wide mouth with 1-3 main-spines. Main-spines slender, straight, and smooth, to thick, wavy and sculptured, about as long as shell diameter. Sparse by-spines, 1-4 times pore diameter.

Diameter: 0.725-1.1 mm.

Castanidium moseleyi