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Diagnosis: Large, thick-walled spherical (rarely ellipsoidal) shell, with small (about 2-3 times bar width) circular or subcircular to subpolygonal pores, often partially framed, wide bars. Circular mouth, with thick rim, elevated as a collar- or crater-like structure. Short (2/3 shell diameter) main-spines. Numerous short (2 times pore diameter) by-spines.

Diameter: 0.9-1.3 mm.

Castanea amphora