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Haeckel

Diagnosis: Shell subregular, octahedral, with 8 triangular, concave, somewhat unequal faces, covered with extremely delicate network of small square dimples, furrowed by radial crests arising from bases of spines. Six radial spines about as long as shell diameter, four-sided, prismatic, with rounded edges, with a verticil (sometimes two) of 4 crossed, curved bristles in basal half, distal apex inflated, with trident or fuscina. Bases of spines with 4 crossed elliptical pores. Mouth cruciform, with 4 small teeth.

Diameter: 0.20-0.25 mm.

Circoporus sexfuscinus