Bryozoans in this family form erect, branched, unjointed and unilaminar colonies, attached by rhizoids. Zooids long, parallel-sided, with almost all of the frontal surface membranous; lateral walls lightly calcified; marginal spines usually present. Pedunculate “bird’s head” avicularia characteristically present. Ovicells independent and hyperstomial, with ectooecium membranous.
(Hayward and Ryland, 1998)
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