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(Haeckel)

Diagnosis: Shell subcircular, lenticular, strongly compressed. Peristome trapezoidal, curved, collar-like lamella, width three times length and equal to diameter of shell, its margin with 6 triangular teeth, 2 convergent ventral, 2 external horizontal lateral, 2 ascending dorsal.

Diameter: 0.15 mm.

Protocystis murrayi