Colony encrusting, unilaminar to multilaminar and nodular, or erect, branching, often robust. Autozooids with umbonuloid frontal shield bordered by marginal areolae. Primary orifice with or without a lyrula; condyles variably developed. Oral spines present or absent. Avicularia adventitious, often polymorphic, usually suboral. Peristome often well developed. Ovicell prominent, imperforate, or with few pores.
(Hayward and Ryland, 1999)