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Bryozoans in this family form erect or encrusting colonies. Frontal wall well developed umbonuloid. Primary orifice without a sinus, uncalcified; obscured by calcified peristome and secondary orifice. Marginal areola present. Frontal spiramina evanescent or permanent, single or multiple. Avicularia usually present.
(Hayward and Ryland, 1999)