Watersipora complanata is an encrusting bryozoan. Colonies form broad, white spreading sheets, which may be composed of a single or multiple layers of autozooids. Autozooids are oval to hexagonal and flat. They are 0.6-0.9 by 0.3-0.5 mm.
The species is able to colonise rocks, shells and the underside of stones on the lower shore.
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