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Diagnosis: Shell triangular, strongly compressed, with three rounded corners, or nearly semi-circular. Aboral margin straight, horizontal, longer than convex dorsal and ventral margins. Peristome with 2 parallel, triangular, pointed teeth, obliquely ascending, lamellar, with inflated ovate base, about as long as shell radius.

Diameter: 0.2-0.4 mm.

Protocystis sloggetti