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Colony boring into shells of dead and living molluscs; diffuse, visible as small perforations in the shell surface linked by fine subsurface traceries. Autozooids occur singly below each perforation, orientated perpendicular to the shell surface; linked by pseudostolonate processes originating from the distal end of each autozooid. Orifice terminal, typically asymmetrical and enantiomorphic. Embryos brooded singly within the autozooids.