Esperiopsis fucorum is an intense reddish orange encrusting soft sponge, which becomes colourless in alcohol. The body shape is highly variable amongst individuals (extremely polymorphic) and individuals are fast growing, changing shape within a few weeks. Growth forms include thin sheets, cushions, massive-lobose or branched. It can also occur in hollow 'amphora' shaped forms in sheltered conditions.Pigment can be squeezed out between the fingers. The sponge is thought to go colourless in deeper water. Has also been found growing up hydroid stems.
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