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(Haeckel)

Diagnosis: Shell ovoid, slightly compressed, with one large conical spine and sometimes a few smaller spines on aboral pole, half as long as radius. Peristome short and wide, collar-shaped, about twice as wide as long, half as long as radius, obliquely inclined over mouth, with 2 divergent straight teeth, conical and longer than shell radius. Base of each tooth with large ovate pore in wall of peristome.

Diameter: 0.08-0.10 mm.

Challengeranium diodon