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Diagnosis: Shell lens-shaped, compressed, nearly circular in side view, with 18-26 equally spaced, radial teeth on the margin, about equal in length. Marginal spines conical, straight, scarcely third to at most half as long as shell radius. Peristome short, channel-shaped, with 2 lateral, parallel, pointed teeth, vertical or slightly inclined ventrally. Peristome with teeth usually somewhat longer than the marginal spines.

Diameter: 0.13-0.15 mm.

Challengeron radians