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(Murray)

Diagnosis: Shell lenticular, strongly compressed laterally, subcircular in lateral view, aboral margin with 2 short divergent spines, one dorsal, one ventral. Peristome vertical, slender, semi-tubular, about as long as shell radius, distal half forked, extending into 2 sub-parallel teeth.

Diameter: 0.08-0.2 mm.

Protocystis balfouri