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Murray

Diagnosis: Shell subcircular, lenticular, strongly compressed, with 14 to 18 slender, straight, rarely slightly curved, radial spines on margin. Spines straight, equidistant, cylindrical, about as long as shell radius. Peristome short, with 2 parallel, vertical, lateral, straight teeth, less than half length of spine.

Diameter: 0.14-0.17 mm.

Challengeron channeri